Best G Body Rear Suspension for Arms, Springs and Coilovers

#1 · Best Overall

1. UMI Performance 301417-R

• Weight: 17.2 lb

Best for: Adjustable Upper Arm Set.

Why it ranks #1: The G-body set includes tubular lower arms and adjustable upper arms, making it the most complete adjustable rear control-arm package listed.

UMI Performance combines tubular lower control arms with adjustable upper control arms in this rear set for 1978–1988 GM G-Bodies. That mix gives buyers a complete upper-and-lower arm package while retaining adjustment at the upper arms, a useful distinction for suspension builders selecting components by position and function.

The kit includes one set of tubular lower arms and one set of adjustable upper arms, so both rear arm positions are represented without treating every arm as adjustable. That distinction matters when planning an installation or coordinating with existing suspension components. The stated application is 1978–1988 GM G-Body, and the product is identified as red. The supplied details do not describe bushings, adjustment range, or specific handling changes, so those should not be assumed from the arm configuration alone.

Skip it if you need a listed two-inch rear lowering spring set rather than control arms; UMI Performance 4051R supplies rear springs for that use.

Choose this UMI set when replacing both rear arm positions and wanting adjustability at the uppers. The supplied facts do not state an adjustment range or bushing details, so account for those limits in your build plan.

Listed on Amazon as: UMI Performance 301417-R GM G-Body UMI Perf. Rear Adjustable Upper and Lower Control Arm Set – Red

#2 · Complete Arm Set

2. AngyMeck Trailing Arm Kit

• Weight: 23.2 lb

Best for: Complete G-Body Arm Refresh.

Why it ranks #2: This kit includes both rear upper and lower trailing arms and lists fitment across several G-body models, supporting a full arm refresh.

The AngyMeck kit supplies both rear upper and lower trailing arms, giving G-Body owners one package for refreshing aging, rusted, or bent factory suspension components. Its listed fitment covers several familiar GM models, including Monte Carlo, Cutlass, Regal, Malibu, El Camino, and Grand Prix, across specified model-year ranges.

Having both upper and lower arms together can simplify sourcing for a rear suspension refresh, rather than piecing those two arm positions together separately. The stated fitment spans 1978–1988 Monte Carlo and Cutlass, while other listed applications have narrower year ranges, so the model-specific coverage matters when selecting parts. At 23.2 pounds, the package is a substantial set of components; the supplied information identifies the arms but does not specify included bushings or installation hardware.

Skip it if you need stated bushing or hardware details before ordering; this listing does not identify them, while Speedway Motors 91634055 clearly states its arms are sold without bushings.

Choose this package for a G-Body owner replacing both rear arm positions in one purchase, particularly on a listed Monte Carlo or Cutlass. Check the exact model-year fitment; coverage varies by vehicle.

Listed on Amazon as: Rear Trailing Control Arm Kit for 78-88 GM G-Body Monte Carlo

#3 · Bushed Arm Upgrade

3. Speedway Motors Arms with Bushings

• Weight: 23 lb

Best for: Poly-Bushed Tubular Arm Upgrade.

Why it ranks #3: Tubular steel arms come with polyurethane bushings, providing a complete arm-and-bushing option for buyers who want both components together.

Tubular steel construction and polyurethane bushings are the defining combination in Speedway Motors’ rear control arms for 1978–1988 GM G-Bodies. The listing connects the stiffer arm-and-bushing setup with reduced flex, better traction, and less wheel hop, giving owners a targeted replacement for the rear arms rather than a spring or shock conversion.

The tubular construction is described as more rigid than stock arms, supporting the stated aim of improving traction and minimizing wheel hop. Polyurethane bushings resist flexing and deflection more effectively than standard rubber, which the listing links to greater suspension responsiveness. Together, those details make this a focused arm replacement for a G-Body rear suspension. Its stated coverage spans 1978–1988, and the black painted finish is identified as corrosion-resistant for the components.

Skip it if you need an adjustable upper-and-lower arm set; UMI Performance 301417-R lists adjustable upper arms and tubular lower arms for 1978–1988 G-Bodies.

This fits owners seeking rear control arms with bushings already specified as polyurethane, plus a rigidity-focused upgrade. It is an arm-and-bushing choice, not a coil-over or ride-height adjustment kit.

Listed on Amazon as: Rear Control Arms with Bushings, For 1978-88 GM G-Body

#4 · Adjustable Rear Height

4. QA1 Rear Coil-Over Kit

• Weight: 23.9 lb

Best for: Adjustable Rear Ride-Height Tuning.

Why it ranks #4: The rear pair offers adjustable rebound and compression valving, with listing details describing ride-height adjustment from above to below stock.

QA1’s rear coil-over conversion pairs ride-height adjustment with shocks offering adjustable rebound and compression valving, letting G-Body owners tune stance and handling characteristics together. The listing gives a range from half an inch above stock to 2.25 inches below stock and identifies the kit as a pair for compatible cars with the QA1 Big Wheel Kit.

The adjustable ride height lets an owner set the rear stance within the listed range, while adjustable rebound and compression valving provide a way to tailor shock response. The listing describes adjustment as quick and identifies compatibility with a QA1 Big Wheel Kit, making that existing setup a key consideration before purchase. It is a rear conversion sold as a pair, so it addresses the rear rather than a complete front-and-rear suspension conversion.

Skip it if you need a front-and-rear coil-over package; Aldan American 300106 lists both axles, while this QA1 kit covers the rear.

This suits G-Body owners with the specified QA1 Big Wheel Kit who want rear ride-height and shock-response adjustments. Keep its rear-only scope and listed compatibility in mind when planning a broader suspension change.

Listed on Amazon as: QA1 Rear Coil-Over Conversion Kit for 1978-1988 Compatible with GM G-Body w/QA1 Big Wheel Kit [Single-Adjustable Shocks]

#5 · Front And Rear Kit

5. Aldan American Coilover Kit

• Weight: 50 lb

Best for: Full-Axle Coilover Conversion.

Why it ranks #5: This small-block G-body kit covers front and rear suspension and lists ride-height adjustment, though it is broader than a rear-only search.

Aldan American’s 300106 kit covers both front and rear, giving small-block G-Body owners a single coil-over package for adjusting ride height at both ends. The listing names a broad set of compatible models and says the kit works with factory and aftermarket control arms, useful flexibility when building around different arm choices.

The stated lowering ranges—zero to two inches at the front and zero to three inches at the rear—let owners set each end within its own adjustment window. Compatibility with factory and aftermarket control arms can preserve flexibility in an existing suspension build. Listed applications include 1978–1988 Grand National, Regal, Malibu, Monte Carlo, El Camino, Caballero, and Cutlass, with 442 and Grand Prix fitment through 1987; confirm the exact model and year against those ranges.

Skip it if you want rear-only lowering springs rather than a full coil-over kit; UMI Performance 4051R is a rear spring set with a stated two-inch drop.

Consider this for a compatible small-block G-Body project needing front-and-rear coil-overs and separate lowering ranges. Its listed vehicle-year coverage differs by model, so verify that your exact application falls within it.

Listed on Amazon as: Aldan American Front & Rear Coilover Kit for 78-88 GM G-Body Small Block

#6

6. UMI Performance Lowering Springs

• Weight: 15.7 lb

Best for: Two-Inch Rear Spring Drop.

Why it ranks #6: The rear-only spring pair is specified for a two-inch lowering setup and lists GM G-body fitment alongside A-body applications.

UMI Performance’s 4051R is a pair of rear coil springs with a stated two-inch lowering amount, offering a direct spring-focused route to a lower rear stance. Its listed fitment includes GM G-Bodies from 1977–1988 as well as specified A-Body years, making the platform and rear-only scope central to choosing it.

Because this is a pair of coil springs for the rear only, it targets rear ride height without replacing control arms or specifying a full suspension conversion. The stated two-inch drop gives buyers a concrete stance change to plan around, while the 1977–1988 GM G-Body application identifies the relevant platform range. The listing also includes GM A-Body applications for 1964–1972. It does not provide a spring rate or describe included shocks, so those details are not established here.

Skip it if you need adjustable rear shock valving alongside ride-height changes; QA1 122-RCK52366 lists adjustable rebound and compression for the rear.

This is for owners seeking a specified two-inch rear drop through springs on a listed G-Body or A-Body. It is rear-only, and the supplied description does not establish a spring rate or shock package.

Listed on Amazon as: UMI Performance Suspension Spring Kit, 2 in Lowering, 2 Coil Springs, Black Powder Coat, Rear Only, GM A-Body 1964-72 / GM G-Body 1977-88, Pair

#7

7. Woosphy Coilover Conversion Kit

Best for: Matched Front-Rear Coilovers.

Why it ranks #7: The kit lists GM G-body fitment and adjustable front and rear coilovers, with a stated rear spring rate of 250–300 pounds.

Woosphy’s kit pairs 500-pound front springs with 250–300-pound rear springs in an adjustable coil-over conversion for 1978–1988 GM G-Bodies. The combined front-and-rear package gives buyers spring-rate figures for both ends and listed mounting styles, helping frame a whole-car conversion rather than a rear-only suspension change.

The stated front rate is 500 pounds and the rear rate is 250–300 pounds, giving a buyer concrete figures when considering a matched front-and-rear setup. Adjustable coilovers allow adjustment, while the listing identifies front lower stud-plate and rear upper and lower loop mounts to inform installation planning. It also specifies a ten-inch front coil height and nitrogen-charged shocks. The supplied facts do not state a ride-height range, so the adjustment amount should not be inferred.

Skip it if you need a specified ride-height range before choosing coilovers; QA1 122-RCK52366 gives an above- and below-stock range for its rear kit.

Consider this for a 1978–1988 G-Body build seeking front-and-rear coilovers with listed spring rates and mounting styles. The supplied details do not quantify ride-height adjustment, which limits stance planning.

Listed on Amazon as: 500lbs Front 300lbs Rear Complete Coilover Conversion Kit

#8

8. Speedway Motors Arms Without Bushings

• Weight: 17 lb

Best for: Boxed-Steel Arm Set.

Why it ranks #8: Boxed steel rear arms are listed for G-body models, but the product excludes bushings, which buyers must source separately.

Speedway Motors uses boxed steel construction for this rear trailing control arm set, pairing greater rigidity than factory stamped arms with a stated aim of reducing wheel hop. Its listed 1978–1988 GM G-Body coverage includes Monte Carlo, Cutlass, Regal, and Malibu, giving buyers a clear application range for an arm-focused upgrade.

The boxed steel design is described as stronger and more rigid than factory stamped arms, which the listing connects to rear suspension stability and wheel-hop control. The set is intended for the rear trailing-arm position on the named G-Body vehicles. Bushings are not included, but the description identifies compatible Speedway polyurethane bushings and stock-style Moog K-6178 bushings as options. Buyers therefore need to plan for bushings separately rather than treating this as a fully bushed assembly.

Skip it if you want control arms with polyurethane bushings included; Speedway Motors 91634057 lists rear arms with polyurethane bushings for 1978–1988 G-Bodies.

Choose this set for a G-Body owner seeking boxed-steel rear arms and willing to source bushings separately. Its stated model range covers several common applications through 1988, but the kit is not bushed.

Listed on Amazon as: Rear Trailing Control Arm Set for 78-88 GM G-Body, Steel, W/O bushings

#9

9. Allstar Performance Adjustable Upper Arm

• Weight: 3.4 lb

Best for: Adjustable Upper Arm Replacement.

Why it ranks #9: This is a tubular adjustable steel upper trailing arm for G-body applications, but the listing is for one arm rather than a full set.

Allstar Performance lists this as a single adjustable tubular upper rear trailing arm for 1978–1988 GM G-Bodies, making it a focused choice for replacing or changing one arm position. Its alloy-steel construction and adjustable design distinguish it from complete upper-and-lower kits, while the each-unit quantity is important when planning a paired setup.

Because the package contains one upper trailing arm, it suits buyers sourcing that specific position rather than replacing both upper and lower arms as a set. Its adjustable construction offers an adjustment feature, although the supplied details give no adjustment range or procedure. Alloy steel identifies the listed material, and 1978–1988 GM G-Body fitment sets the application window. Planning around the single-unit quantity helps avoid assuming that the listing supplies a pair.

Skip it if you need both rear upper and lower arms in one package; AngyMeck AM498452 lists a complete upper-and-lower trailing arm kit.

This fits a G-Body owner replacing or adjusting an upper rear arm individually. It is listed as one arm, so plan the quantity needed and note that no adjustment range is provided.

Listed on Amazon as: Allstar Performance Allstar PerformanceAllstar Trailing Arm, Rear, Upper, Tubular, Adjustable, Steel, Natural, GM G-Body 1978-88, Each (ALL57824)

#10

10. BMR Rear Shock Tower Brace

• Weight: 6.8 lb

Best for: Bolt-In Rear Tower Bracing.

Why it ranks #10: The bolt-in brace is listed for GM G-body fitment, but it reinforces the chassis rather than replacing rear suspension components.

BMR’s rear shock tower brace uses a 100% bolt-in design, giving 1978–1987 GM G-Body owners a chassis reinforcement component that does not call for a listed welded installation. The brace combines 1.250-inch DOM steel tubing with 3/16-inch steel plate, making its construction and installation style the central buying points.

The bolt-in design gives the installation a defined approach, while the 1.250-inch DOM tubing and 3/16-inch steel plate identify the brace’s construction. Its stated 1978–1987 G-Body fitment is narrower than some suspension listings, so the vehicle year matters before selecting it. This is a rear shock tower brace, not a control arm, spring, or coil-over kit; it adds a different type of component to a suspension-related build.

Skip it if you own a 1988 G-Body; Speedway Motors 91634055 lists rear trailing-arm fitment through 1988, while this brace lists 1978–1987.

This suits owners of listed 1978–1987 G-Bodies seeking a rear shock tower brace with bolt-in construction. It is chassis reinforcement rather than a replacement arm or ride-height component.

Listed on Amazon as: BMR Suspension – Shock Tower Brace, Rear