Best Go Kart Reverse Kit for 30- and 40-Series Builds

#1 · Best Overall

1. maXpeedingrods Go Kart Gearbox

• Weight: 12.35 lb
• Dimensions: 7.87 x 7.87 x 7.87 in

Best for: 30 Series chain flexibility.

Why it ranks #1: Its 30 Series fitment covers engines up to 14HP, and the listing specifies shaft dimensions, ratios, cable length, and two chain sprockets.

Included 10T and 12T sprockets let this maXpeedingrods gearbox accommodate listed #40/41/420 and #35 chain setups. Its forward and reverse gearing adds maneuvering options for go-karts and utility vehicles, while the stated engine limit of 14HP gives buyers a clear power-range boundary for selecting a 30 Series setup.

The 5/8-inch shaft with a 3/16-inch keyway gives buyers specific dimensions to compare with their driven-clutch connection before installation. A five-foot shifter cable provides a stated routing length, and the 1:1:3 forward and 1:2:6 reverse ratios identify the gearing for each direction. Because the kit is specified for 30 Series use and engines up to 14HP, it suits buyers who can verify both conditions against their vehicle.

Skip it if you need a gearbox for a 40 Series setup; GXYWADY’s 40 Series Forward Reverse Gearbox Replacement lists 11–18HP engines.

This kit suits a 30 Series go-kart or utility-vehicle owner who wants forward and reverse operation and can use one of the listed chain sprockets. Check the shaft and engine limits before choosing it.

Listed on Amazon as: maXpeedingrods Go Kart Forward Reverse Gearbox Kit 212cc 30 Series

#2 · Best Included Hardware

2. Tuningsworld Go Kart Gearbox

• Weight: 12.57 lb
• Dimensions: 9.06 x 7.48 x 7.09 in

Best for: 30 Series complete shifter setup.

Why it ranks #2: The 30 Series kit lists forward, neutral, and reverse operation plus mounting plates, shifter parts, two cables, and 10T and 12T sprockets.

A package listing that includes mounting plates, a shifter disc, two shifter cables, a shifter assembly, and two sprockets makes this Tuningsworld kit useful for buyers assembling a 30 Series reverse setup. Its 5/8-inch shaft and stated forward and reverse ratios provide additional drivetrain details for fit planning.

The included mounting plates and shifter assembly give a builder named installation and control components to work with, while two shifter cables and the shifter disc support the shift setup. Tuningsworld also lists 10T and 12T sprockets for chain matching and a 5/8-inch shaft with a 3/16-inch keyway for checking the driven connection. The stated 30 Series-only limitation and ratios of 1:1:3 forward and 1:2:6 reverse help define its intended use.

Skip it if you need a gearbox for a 40 Series drivetrain; Blast’s 40 Series gearbox lists 11HP–18HP engines and two chain options.

This suits a 30 Series builder who wants listed mounting and shifting components alongside forward and reverse gearing. Check the shaft, engine range, and chain arrangement carefully, since the stated series boundary is specific.

Listed on Amazon as: Go Kart Forward Reverse Gear Box Kit for 2HP-13HP Engine 5/8

#3 · Best Chain Options

3. GXYWADY 30 Series Gearbox

• Weight: 12.45 lb
• Dimensions: 7.87 x 7.87 x 7.87 in

Best for: 30 Series three-mode operation.

Why it ranks #3: This 30 Series kit supports 2HP–13HP engines and lists 35-chain 12T plus 40/41/420-chain 10T fitment and three shift modes.

Forward, reverse, and neutral give this GXYWADY gearbox three distinct shift positions for go-karts and utility vehicles. Its stated 2HP–13HP engine range and 30 Series torque-converter compatibility help narrow the application, while two listed chain-and-sprocket combinations offer choices for matching the drivetrain.

The three shift modes let a driver select reverse for repositioning and neutral when forward drive is not wanted, adding practical control beyond a forward-only setup. GXYWADY specifies a 30 Series torque converter and engines from 2HP to 13HP, defining the intended powertrain range. The listing gives 35-chain 12T and 40/41/420-chain 10T options, and a 5/8-inch shaft with a 3/16-inch keyway, which helps buyers compare key drivetrain connections before installation.

Skip it if you need a 40 Series gearbox for an 11HP–18HP engine; GXYWADY’s 40 Series Forward Reverse Gearbox Replacement lists that range.

This suits a 30 Series go-kart or utility-vehicle owner seeking three shift modes and defined chain options. Its 13HP ceiling and 5/8-inch shaft are important boundaries to check against the drivetrain.

Listed on Amazon as: GXYWADY Forward Reverse Gearbox Kit Replacement for 2HP-13HP Go Kart

#4

4. SEBLAFF 30 Series Gearbox

• Weight: 12.35 lb
• Dimensions: 7.87 x 7.87 x 7.87 in

Best for: 30 Series chain options.

Why it ranks #4: It is specified for 2HP–13HP engines with a 30 Series torque converter and lists both 35-chain 12T and 40/41-chain 10T fitment.

Support for both 35-chain 12T and 40/41-chain 10T setups gives this SEBLAFF gearbox two stated sprocket-and-chain configurations. Its fitment covers 2HP–13HP engines with a 30 Series torque converter, helping buyers narrow the match for a 212cc go-kart or another listed application before installation.

The two chain configurations give builders a way to match the gearbox to either a 35-chain 12T or a 40/41-chain 10T setup, rather than relying on an unspecified sprocket arrangement. SEBLAFF lists engines from 2HP to 13HP and specifies a 30 Series torque converter, which narrows the fit decision. The description also calls the assembly compact and convenient to install, while its wear-resistant, lightweight material claim supports routine use without adding a stated maintenance requirement.

Skip it if you need a gearbox specified above 13HP; GXYWADY’s 40 Series replacement lists engines from 11HP to 18HP.

This suits a 30 Series owner choosing between the listed 35-chain and 40/41-chain arrangements, especially for a 212cc kart. Its stated engine ceiling is 13HP, so power-range fit remains essential.

Listed on Amazon as: 30Series Forward Reverse Gear Box Kit 35Chain 12T 2300rpm

#5

5. COMODO 30 Series Gearbox

• Weight: 4.2 oz
• Dimensions: 12 x 8 x 3 in

Best for: 30 Series ratio details.

Why it ranks #5: The listing identifies 30 Series compatibility, 2HP–14HP engines, a 5/8-inch shaft with a 3/16-inch keyway, and forward and reverse ratios.

Stated forward and reverse ratios make this COMODO gearbox useful for buyers comparing drivetrain behavior as well as basic fit. It is listed for 30 Series torque converters and engines from 2HP to 14HP, with a 5/8-inch driven-clutch shaft and 3/16-inch keyway identified in the description.

COMODO specifies a 1:1:3 forward ratio and 1:2:6 reverse ratio, giving buyers concrete gearing details to consider for maneuvering and reverse travel. Its 2HP–14HP engine range and 30 Series torque-converter application narrow the intended powertrain. The listed 5/8-inch shaft with a 3/16-inch keyway offers a practical fit reference for the driven clutch, while the description says installation instructions are included to support setup work.

Skip it if you need listed chain and sprocket choices; maXpeedingrods’ 30 Series gearbox includes 10T and 12T sprockets for specified chains.

This fits a buyer selecting a 30 Series gearbox within the stated 2HP–14HP range who values published ratios and shaft dimensions. Chain and sprocket details are not specified in the supplied listing.

Listed on Amazon as: Forward Reverse Gear Box Kit Compatible with Go Kart Engines 2HP to 14HP for 30 Series

#6

6. JNDO 30 Series Gearbox

• Weight: 12.1 lb

Best for: Three-mode DIY builds.

Why it ranks #6: This kit specifies a 30 Series gearbox for engines up to 13HP or 420cc, with forward, neutral, and reverse modes.

Forward, neutral, and reverse modes are the defining feature of JNDO’s 30 Series gearbox, giving a DIY go-kart builder distinct settings for maneuvering and stopping in neutral. The listing supports engines up to 13HP, including 420cc, so buyers can judge whether its stated power range suits their build.

The three shift modes make the gearbox useful when a kart needs to move backward or sit in neutral rather than relying on forward operation alone. JNDO lists compatibility with engines up to 13HP and specifically mentions 420cc, helping buyers assess the engine side of a build. Its 30 Series designation narrows the intended torque-converter setup, while the DIY assembly description makes it a fit for builders planning an upgrade rather than a ready-to-run vehicle.

Skip it if you need stated shaft and sprocket dimensions before purchase; maXpeedingrods’ 30 Series kit lists a 5/8-inch shaft and included sprockets.

This is for a DIY builder whose engine falls within the listed 13HP range and who wants neutral as well as forward and reverse. Its 30 Series designation is an important boundary when selecting a gearbox.

Listed on Amazon as: JNDO Go Kart Forward Reverse Gearbox Kit 30 Series for 212cc 420cc Engine

#7 · Best 40 Series Fit

7. GXYWADY 40 Series Gearbox

• Weight: 20.8 lb

Best for: Higher-power 40 Series replacement.

Why it ranks #7: Its 40 Series fitment targets 11HP–18HP engines, including Predator 420cc, and lists a 3/4-inch jackshaft and 12T 530-chain sprocket.

A 40 Series fit and stated support for 11HP–18HP engines distinguish this GXYWADY replacement from lower-power gearbox kits. The listing names Predator 420cc and Duromax 11HP-and-over applications, while its 3/4-inch jackshaft and 12-tooth sprocket for 530 chain provide concrete points for checking a heavier go-kart or utility-vehicle setup.

The 3/4-inch jackshaft with a 3/16-inch keyway gives buyers a specific connection dimension to compare with their existing assembly. Its 12-tooth sprocket is listed for 530 chain, helping establish the chain-side match. GXYWADY identifies the unit as a 40 Series replacement for 11HP–18HP engines and calls out Predator 420cc and Duromax applications, so it is aimed at larger-engine setups rather than a general 30 Series installation.

Skip it if you need a 30 Series gearbox for smaller engines; GXYWADY’s 2HP–13HP replacement lists 30 Series compatibility and multiple chain options.

This replacement is for buyers setting up a 40 Series drivetrain with an engine in the listed 11HP–18HP range. Check the 3/4-inch shaft and 530-chain sprocket against the existing assembly before selecting it.

Listed on Amazon as: GXYWADY 40 Series Forward Reverse Gearbox Replacement for Go-Karts

#8

8. Blast 40 Series Gearbox

• Weight: 22 lb

Best for: Heavier 40 Series applications.

Why it ranks #8: This 40 Series gearbox suits 11HP–18HP engines and offers 3/4-inch jackshaft fitment, but the driver and driven clutch are sold separately.

The 40 Series gearbox is listed for 11HP–18HP engines, with Predator 420cc among the named applications, making this Blast unit relevant to heavier go-kart builds. Buyers can choose the listed 10T sprocket for 420 chain or 12T sprocket for 530 chain, but the gearbox ships without driver or driven clutches.

The listed 3/4-inch jackshaft and 3/16-inch keyway give buyers specific dimensions to compare with their drivetrain. Chain choice is addressed through a 10-tooth sprocket for 420 chain or a 12-tooth sprocket for 530 chain, helping narrow the setup. Blast identifies the unit as a 40 Series gearbox for 11HP–18HP applications, including Predator 420cc, while explicitly stating that driver and driven clutches are not included and are sold separately.

Skip it if you need included driver and driven clutches; Tuningsworld’s 30 Series kit lists a shifter assembly and sprockets in its package contents.

This suits a heavier 40 Series kart or utility-vehicle build using a listed chain option and compatible shaft. Plan separately for driver and driven clutches, which this gearbox kit does not include.

Listed on Amazon as: Go Kart Forward Reverse Gearbox Kit Compatible with 11-16 hp Engines, Predator 420CC- 3/4" jackshaft (10T Sprocktet 420 Chain)

#9

9. TAuTwA 150CC 200CC Gear Set

Best for: 150cc and 200cc gear-set fit.

Why it ranks #9: The gear set is specifically described for 150cc and 200cc karts, but its listing provides fewer interface and included-hardware details than the gearbox kits.

Compatibility with 150cc and 200cc go-karts is the key detail of this TAuTwA forward-and-reverse gear set, giving owners of those engine sizes a specific application to check. The listing also calls out smooth switching between directions, making it relevant to buyers replacing a gear set rather than choosing a broadly specified gearbox kit.

The stated fit for 150cc and 200cc go-karts helps narrow the choice to owners working with those engine sizes, rather than buyers shopping by horsepower or torque-converter series. TAuTwA describes the item as a metal gear set and says it is intended for smooth forward-to-reverse switching. Its description also identifies installation as easy, though the supplied information does not give shaft, chain, or sprocket dimensions for a more detailed fit check.

Skip it if you need a gearbox with stated shaft and chain dimensions; Tuningsworld’s 30 Series kit lists a 5/8-inch shaft and chain sprockets.

This gear set is aimed at owners of 150cc or 200cc go-karts seeking forward and reverse switching. Its application is narrower than an engine-power-rated kit, and the listing leaves key installation dimensions unspecified.

Listed on Amazon as: Forward and Reverse Gear Set Fit for 150CC 200CC Kart

#10

10. ICONSPORTSS Shaft Drive Reverse Box

Best for: Horizontal-engine quad reverse.

Why it ranks #10: This is a shaft-drive reverse assembly for 100cc–150cc horizontal engines, not the 30 or 40 Series forward-reverse gearbox format most listings cover.

A shaft-drive reverse transfer case for 100cc–150cc horizontal engines sets this ICONSPORTSS assembly apart from chain-oriented 30 Series kits. Its listed applications include 110cc, 125cc, and 150cc quads and go-karts, giving owners of small horizontal-engine vehicles a distinct reverse-system format to consider.

The shaft-drive transfer-case format is the central fit consideration: it targets vehicles using that kind of reverse transfer rather than the chain and torque-converter arrangements described by other kits. ICONSPORTSS lists 100cc, 110cc, 125cc, and 150cc horizontal engines, with quads and go-karts among the intended vehicles. That engine and vehicle scope helps buyers screen an application, but the supplied information does not provide shaft dimensions or installation details.

Skip it if you need a 30 Series chain-and-sprocket gearbox; Tuningsworld’s kit lists a 5/8-inch shaft and 10T and 12T sprockets.

This is for owners of small quads or go-karts with a listed horizontal engine who need a shaft-drive reverse transfer case. Confirm that this format suits the vehicle, since no shaft dimensions are provided.

Listed on Amazon as: ATV UTV Reverse Gear Box Assembly Kit – Shaft Drive Reverse Gear Transfer Case Forward Backward Converter Transfer for 100cc 110cc 125cc 150cc Engine Quad Go Kart Motorcycle