A strong torque converter lockup kit matches your transmission and supplies the switches, wiring, or controls needed for its intended installation. For TH700R4 owners who want a broad set of listed components, Edelbrock 60109 is a strong choice; American Autowire 500412 explicitly covers both 700R4 and 2004R transmissions. This lineup also includes a vacuum-referenced TCI kit, a replacement switch assembly for several transmissions, a B&M kit with limited listed detail, and a Ford 4R100 repair conversion kit.
Those differences matter: a kit intended for a 4R100 is not an interchangeable choice for a GM 700R4, and the American Autowire kit requires a specific threaded pressure port. Check your transmission and installation needs before choosing.
Edelbrock 60109 is the best overall choice in this group for a TH700R4 installation because its listed components include a vacuum switch, 4th gear pressure switch, brake switch, lock-up solenoid, wire harness, gasket, and mounting hardware. That component list makes it the most complete documented option here. If your transmission is a 2004R as well as a 700R4, American Autowire 500412 is a more explicitly cross-listed match, provided your transmission has the required 3/8 NPT threaded 4th gear pressure port.
Our Top Picks
Best OverallFor TH700R4 owners, it lists a vacuum switch, 4th gear pressure switch, brake switch, solenoid, harness, gasket, and mounting hardware.
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Best Dual-Fit KitIt explicitly fits 700R4 and 2004R transmissions, with a pressure switch and in-line fuse; installation requires a 3/8 NPT pressure port.
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Vacuum-Referenced ControlThe GM 700R4/200R4 wiring kit references engine vacuum to engage or disengage lock-up, and its vacuum reference can be overridden.
View on Amazon- Replacement Switch Kit WFLNHB Lock up Switch Kit
Compare torque converter lockup kit options
| # | Product | Weight | Buy |
|---|---|---|---|
| 1 | 1. Edelbrock 60109Best Overall | 15.68 oz | View on Amazon |
| 2 | 2. American Autowire 500412Best Dual-Fit Kit | 5.6 oz | View on Amazon |
| 3 | 3. TCI 376600Vacuum-Referenced Control | 11.7 oz | View on Amazon |
| 4 |  4. WFLNHB Lock up Switch KitReplacement Switch Kit | — | View on Amazon |
| 5 |  5. B&M 70244B&M lock-up kit shoppers | 1 lb | View on Amazon |
| 6 |  6. TransGo 4R100-LUFord 4R100 lock-up repair | 1 lb | View on Amazon |
Detailed Reviews: Best Torque Converter Lockup Kit
#1 · Best Overall
1. Edelbrock 60109
- Weight: 15.68 oz
Best for: TH700R4 wiring-kit assemblers.
Why it ranks #1: For TH700R4 owners, it lists a vacuum switch, 4th gear pressure switch, brake switch, solenoid, harness, gasket, and mounting hardware.
A bundled set of vacuum and 4th-gear pressure switches, brake switch, lock-up solenoid, harness, gasket, and mounting hardware gives TH700R4 owners the key listed components together. That inclusion can simplify gathering parts for a lock-up installation, while the transmission-specific title makes the stated application clear.
The vacuum switch and 4th-gear pressure switch provide two named switching components, while the brake switch and lock-up solenoid are also included. The wire harness, pan gasket, and mounting hardware round out the package, so buyers can plan around those supplied installation parts rather than sourcing each separately. Its stated TH700R4 application narrows the fit decision: this kit is specifically identified for that transmission, not as a universal lock-up solution.
- Includes a vacuum switch and 4th-gear pressure switch
- Includes a brake switch and lock-up solenoid
- Wire harness, transmission pan gasket, and mounting hardware are listed
- Title specifies TH700R4 transmission application
- The stated application is limited to TH700R4; other transmission fits are not listed.
Skip it if you need a kit explicitly listed for both 700R4 and 2004R transmissions; American Autowire 500412 names both applications.
TH700R4 owners who want switches, solenoid, harness, gasket, and mounting hardware in one listed package should consider this kit. Its stated transmission application is specific, so it is not the choice for other transmissions.
Full product details
| Brand | Edelbrock |
|---|---|
| Color | Multicolor |
| Included Components | Vacuum switch, 4th gear pressure switch, brake switch, torque converter lock-up solenoid, wire harness, transmission pan gasket, mounting hardware |
| Item Weight | 15.68 ounces |
| Manufacturer | Painless Performance Products, LLC |
| Material | Plastic / Copper |
| Model | 60109 |
| Warranty Description | 1-Year Limited |
Listed on Amazon as: Edelbrock Painless Performance 60109 Torque Converter Lock-Up Kit for TH700R4 Transmission
View on Amazon#2 · Best Dual-Fit Kit
2. American Autowire 500412
- Weight: 5.6 oz
Best for: 700R4 and 2004R installers.
Why it ranks #2: It explicitly fits 700R4 and 2004R transmissions, with a pressure switch and in-line fuse; installation requires a 3/8 NPT pressure port.
Explicit 700R4 and 2004R application coverage, paired with a 3/8 NPT threaded 4th-gear pressure-port requirement, gives installers a concrete compatibility check before purchase. The pressure switch and in-line fuse are also named, helping buyers understand two elements of the kit rather than relying on a generic lock-up label.
The listed fit covers 700R4 and 2004R transmissions, while the required 3/8 NPT threaded 4th-gear pressure port is a specific installation constraint to check on the transmission. A pressure switch is included in the feature listing, and the in-line fuse identifies an electrical protection component in the kit. Together, those details help an installer assess both transmission-port compatibility and the electrical pieces called out in the supplied information.
- Application listed for 700R4 and 2004R transmissions
- Specifies a 3/8 NPT threaded 4th-gear pressure port requirement
- Pressure switch is listed
- In-line fuse is listed
- Installation requires a 3/8 NPT threaded 4th-gear pressure port.
Skip it if you want a kit listing a brake switch, solenoid, gasket, and mounting hardware; Edelbrock 60109 includes those components.
Installers working with a 700R4 or 2004R who can verify the specified 3/8 NPT 4th-gear pressure port get useful fit details here. That port requirement is the key boundary before selecting this kit.
Full product details
| Brand | American Autowire |
|---|---|
| Item Weight | 5.6 ounces |
| Item model number | 073-500412 |
| Manufacturer | American Autowire |
| Part Number | 500412 |
| Model | JEGS |
| Dimensions | 8.8 x 6.9 x 1.3 inches |
Listed on Amazon as: American Autowire 500412 Torque Converter Lockup Kit 700R4 & 2004R Transmissions
View on Amazon#3 · Vacuum-Referenced Control
3. TCI 376600
- Weight: 11.7 oz
Best for: Vacuum-referenced GM lock-up control.
Why it ranks #3: The GM 700R4/200R4 wiring kit references engine vacuum to engage or disengage lock-up, and its vacuum reference can be overridden.
Vacuum reference automatically engages or disengages the torque converter lock-up clutch, while an override can command lock-up engagement or disengagement. That combination gives GM 700R4 and 200R4 owners both an automatic vacuum-based operating method and a stated way to override it, distinguishing this TCI wiring kit from a basic harness listing.
The kit references engine vacuum to automatically engage or disengage the lock-up clutch, tying operation to the listed vacuum input. Its override adds a separate way to engage or disengage lock-up, giving the buyer an additional control option. TCI identifies the wiring kit for GM 700R4, while the feature listing also names 200R4; those applications provide the fit context for buyers planning a wiring installation on either transmission.
- Engine vacuum reference automatically engages or disengages lock-up
- Override can engage or disengage lock-up
- Listed for GM 700R4
- Feature listing names 200R4 as an application
- The stated application is for GM 700R4/200R4, not a universal transmission fit.
Skip it if you need a kit whose listing names a pressure switch and in-line fuse; American Autowire 500412 lists both for 700R4 and 2004R.
GM 700R4 or 200R4 owners who want vacuum-referenced automatic operation with an override have a specific control approach to consider. Its stated applications are transmission-specific, so buyers outside them should look elsewhere.
Full product details
| Brand | TCI |
|---|---|
| Item Weight | 11.7 ounces |
| Item model number | 376600 |
| Manufacturer | TCI |
| Part Number | 376600 |
| Model | TCI 376600 Universal Lock-Up Wiring Kit for GM 700R4 |
| Dimensions | 3 x 10.5 x 12 inches |
Listed on Amazon as: TCI 376600 Universal Lock-Up Wiring Kit for GM 700R4
View on Amazon#4 · Replacement Switch Kit
4. WFLNHB Lock up Switch Kit
Best for: 4th-gear-only lock-up buyers.
Why it ranks #4: This replacement assembly is listed for TH 700-R4, 4L60, and TH 200-4R K013 transmissions, with a pressure switch and wiring.
This WFLNHB kit specifies lock-up in 4th gear only, making its operating boundary clear for buyers seeking high-gear engagement. Its listed pressure switch and wiring, plus instructions for both external and internal mounting, give installers a defined component set and two mounting approaches to consider.
Compatibility is listed for TH 700-R4, 4L60, and TH 200-4R K013 transmissions, giving buyers several named applications to compare with their vehicle. The pressure switch and included wiring identify core kit contents, while instructions for external and internal mounting offer two stated installation approaches. Because lock-up is specified for 4th gear only, buyers seeking engagement in other gears should treat that operating limit as a deciding factor.
- Lists compatibility with TH 700-R4, 4L60, and TH 200-4R K013 transmissions
- Includes a pressure switch and wiring
- Instructions cover external and internal mounting
- Specifies lock-up in 4th gear only
- Lock-up is limited to 4th gear only.
Skip it if you need explicitly listed 700R4 and 2004R coverage plus a 3/8 NPT port specification; American Autowire 500412 provides those details.
Owners of a listed TH 700-R4, 4L60, or TH 200-4R K013 seeking a 4th-gear-only lock-up switch kit can weigh its two mounting approaches. The transmission match and gear limitation remain central considerations.
Full product details
| Brand | WFLNHB |
|---|---|
| Color | Black |
| Compatible Devices | Vehicles with TH 700-R4 4L60 and TH 200-4R K013 transmissions |
| Compatible with Vehicle Type | Heavy-Duty Trucks, Construction Equipment |
| Contact Material | Copper |
| Control Type | Indirect |
| Item Dimensions | 3.23 x 2.13 x 1.57 inches |
| Dimensions | 3.23 x 2.13 x 1.57 inches |
| Manufacturer | WFLNHB |
| Material | Copper |
| Model | Does not apply |
| Operation Mode | ON-OFF |
Listed on Amazon as: WFLNHB Lock up Switch Kit Replacement for 74416AK TH 700R4 2004R
View on Amazon#5
5. B&M 70244
- Weight: 1 lb
Best for: B&M lock-up kit shoppers.
Why it ranks #5: It is identified as a torque converter lockup kit, but the supplied listing gives no transmission fitment or component details to verify a specific match.
The B&M 70244 is identified as a torque converter lockup kit, giving buyers looking for that category a clearly named B&M model to investigate. The supplied listing provides the brand and model but little application detail, so its most useful role here is as a lead for shoppers who can verify the kit's suitability before choosing it.
B&M identifies this product as a Torque Converter Lockup Kit and lists model 70244. Those details make the product identity straightforward when comparing lock-up kit listings or communicating about a specific B&M model. However, the supplied product information does not describe included switches, wiring, installation steps, or transmission applications. Buyers should therefore treat the title as the available scope and seek application details before relying on it for a particular transmission or installation plan.
- Named as a torque converter lockup kit
- B&M brand is identified
- Model 70244 is specified
- Product title makes its lock-up-kit category clear
- The supplied listing gives no transmission application or included-component details.
Skip it if you need stated 700R4 and 2004R compatibility with a specified pressure port; American Autowire 500412 lists those details.
Shoppers comparing B&M lock-up products may use the 70244 name as a starting point. It suits buyers willing to establish application and package contents independently; the supplied information does not confirm transmission fit or installation components.
Full product details
| Brand | B&M |
|---|---|
| Item Weight | 1 pounds |
| Item model number | 70244 |
| Manufacturer | B&M |
| Part Number | 70244 |
| Model | B&M 70244 Torque Converter Lockup Kit |
Listed on Amazon as: B&M 70244 Torque Converter Lockup Kit
View on Amazon#6
6. TransGo 4R100-LU
- Weight: 1 lb
Best for: Ford 4R100 lock-up repair.
Why it ranks #6: This is a Ford 4R100 lockup repair conversion kit, a different transmission application from the GM-focused kits in this roundup.
The title identifies this as a 4R100-LU lock-up repair conversion kit compatible with Ford 4R100, giving owners of that transmission a specific repair-oriented option to investigate. Its firmer lock-up designation distinguishes the stated purpose, while the limited supplied specifications make transmission application the clearest available selection point.
The product title connects the 4R100-LU kit with Ford 4R100 compatibility and describes it as a lock-up repair conversion kit. That makes the transmission match and repair-conversion purpose the two practical anchors for evaluating it. The listing does not provide further component or installation details, so buyers cannot use the supplied facts to plan a particular procedure or compare included hardware; the stated application should guide initial consideration.
- Title identifies a lock-up repair conversion kit
- Ford 4R100 compatibility is stated
- Product name identifies the 4R100-LU application
- Firmer lock-up is named in the title
- The stated compatibility is limited to Ford 4R100.
Skip it if you need a kit listed for 700R4 and 2004R transmissions; American Autowire 500412 names both applications and a pressure-port requirement.
Ford 4R100 owners seeking a lock-up repair conversion can use the stated compatibility and purpose as their starting point. The application is specific, and supplied details do not explain included components or installation.
Full product details
| Brand | Transparts Warehouse |
|---|---|
| Item Weight | 1 pounds |
| Part Number | 4R100-LU |
Listed on Amazon as: TransGo 4R100-LU Lockup Repair Conversion Kit Compatible With: Ford 4R100 Firmer Lock-up Kit
View on AmazonCheck the transmission application before comparing kit features
Transmission fitment is the first compatibility check, because these listings cover distinct applications rather than one universal setup. Edelbrock 60109 is identified for TH700R4, American Autowire 500412 for 700R4 and 2004R, and TCI 376600 for GM 700R4/200R4. WFLNHB lists TH 700-R4, 4L60, and TH 200-4R K013 compatibility, while TransGo 4R100-LU is for Ford 4R100.
The B&M listing supplies no transmission fitment details, so its title alone is not enough to confirm a match. Check the transmission identification and the kit maker’s fitment instructions before ordering.
This matters especially if a vehicle has had a transmission swap: the vehicle model by itself may not establish which transmission is installed. For a replacement switch kit, WFLNHB also asks buyers to compare the original part and confirm the model number.
Treat the pressure-port requirement as an installation gate
American Autowire 500412 requires a 3/8 NPT threaded 4th gear pressure port, so verify that feature before selecting it. A listed transmission match does not automatically confirm that the transmission has the required port or that the rest of the installation suits your setup. This is a practical distinction between the American Autowire listing and Edelbrock 60109: American Autowire gives the specific port requirement, while Edelbrock lists a 4th gear pressure switch among its components but does not state that same port specification in the supplied product data.
TCI 376600 takes another documented approach by referencing engine vacuum and allowing the vacuum reference to be overridden. The listings do not establish that these approaches are interchangeable.
Match the kit’s stated controls and connection requirements to your transmission and planned installation, and consult the kit instructions where the listing leaves details unstated.
How to Choose a Torque Converter Lockup Kit
Transmission application
Start by matching the kit to the transmission itself, not just the vehicle. Edelbrock 60109 is listed for TH700R4; American Autowire 500412 covers 700R4 and 2004R; TCI 376600 is described for GM 700R4/200R4. WFLNHB lists TH 700-R4, 4L60, and TH 200-4R K013, while TransGo 4R100-LU is intended for Ford 4R100.
The B&M listing does not specify fitment in the supplied data. Buyers with a confirmed TH700R4 have several listed candidates, while someone with a 4R100 should consider the TransGo application instead.
If the transmission identity is uncertain, confirm it before choosing; the product data does not support assuming that these kits cross-fit.
Included controls and wiring
Look at which control and installation parts the listing actually names. Edelbrock includes a vacuum switch, 4th gear pressure switch, brake switch, lock-up solenoid, wire harness, gasket, and mounting hardware. American Autowire lists a pressure switch and in-line fuse, while WFLNHB says its replacement kit includes a pressure switch and all necessary wiring.
TCI describes a vacuum-referenced system with an override, but the supplied data does not enumerate the same component bundle as Edelbrock. Buyers who want a clearly itemized, broad kit should favour Edelbrock; someone replacing a switch assembly may prefer WFLNHB.
Do not assume an unlisted component is included, and check the instructions or seller details when your installation depends on a particular control or connector.
Connection and control approach
Compare the stated connection requirements and control method with your setup before deciding. American Autowire 500412 requires a 3/8 NPT threaded 4th gear pressure port, a specific installation condition that must be checked. TCI 376600 references engine vacuum to engage or disengage the lock-up clutch, and its vacuum reference can be overridden.
Edelbrock lists both a vacuum switch and a 4th gear pressure switch, but the supplied specifications do not state a port size. Buyers who can verify the American Autowire port and want its explicit 700R4/2004R fitment have a clearly defined option; those seeking a described vacuum-reference approach can consider TCI.
The listings do not provide enough detail to compare wiring diagrams or installation difficulty, so use the manufacturer instructions for those decisions.
Which Torque Converter Lockup Kit Should You Choose?
For a TH700R4 owner seeking the most completely itemized package, choose Edelbrock 60109: it lists switches, a solenoid, harness, gasket, and mounting hardware. If you have a 700R4 or 2004R and confirm a 3/8 NPT threaded 4th gear pressure port, American Autowire 500412 is the explicit dual-fit option. Choose TCI 376600 if its stated engine-vacuum reference and override suit your GM 700R4/200R4 setup.
For a replacement switch assembly, consider WFLNHB Lock up Switch Kit after checking the original part and transmission model. B&M 70244 has too little supplied fitment detail to make a specific application recommendation.
TransGo 4R100-LU belongs with a Ford 4R100 repair conversion, not the GM applications listed for the other kits.
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Frequently Asked Questions
How can I confirm which transmission is installed before ordering a lockup kit?
Confirm the transmission using reliable vehicle or transmission records, then compare its identification with the kit’s stated fitment. Do not rely on the vehicle’s model year or appearance alone. The listed options cover different applications, including TH700R4, 2004R, GM 200R4, and Ford 4R100, so verify the exact transmission first.
What does a 3/8 NPT 4th gear pressure port requirement mean for installation?
It means the transmission must have a threaded fourth-gear pressure port matching the stated 3/8 NPT requirement for that kit’s pressure switch. American Autowire 500412 is listed for 700R4 and 2004R transmissions, but only use it after confirming the required port is present; transmission model alone may not confirm it.
What symptoms can indicate that a torque converter lockup circuit is not working correctly?
Possible signs include lockup failing to engage, engaging at an unexpected time, or remaining engaged when it should release. These symptoms can have causes beyond the kit, so check the transmission application and circuit components rather than assuming the converter itself is faulty. A qualified technician can help diagnose the specific cause.
When should I choose a replacement switch instead of a complete kit?
Choose a replacement switch when you are replacing an existing switch assembly and have verified the original part and transmission model. The WFLNHB listing describes a replacement switch kit, while the Edelbrock listing itemizes switches, a solenoid, harness, gasket, and mounting hardware for a TH700R4 installation.
What should I consider when choosing a lock-up wiring kit for a GM transmission?
Match the kit to the specific transmission and its stated operating approach. TCI 376600 is described for GM 700R4 and 200R4 setups and uses an engine-vacuum reference with an override. For a 700R4 installation needing a more fully itemized package, Edelbrock 60109 lists multiple switches, a solenoid, harness, gasket, and hardware.
Final Words
For a TH700R4 installation, Edelbrock 60109 is the clearest overall choice because its listed components make it the most completely documented package here. If you have a 700R4 or 2004R and confirm the required 3/8 NPT pressure port, American Autowire 500412 is the explicit dual-fit option. Match the other kits to their stated use, and verify transmission identity and fitment before ordering.
