Answering the common buyer question, these rear upper control arms are aimed at GM G-Body restorations and performance builds. This guide highlights top options for 1978–1988 Monte Carlo, Regal, Malibu, Cutlass, Grand Prix, El Camino, and similar models. The best picks focus on adjustability, durability, and ease of installation. Choose this if you’re refreshing the rear suspension, seeking better handling, or preparing for track days. Choose this if you want a full rear arm kit that covers both upper and lower arms for a complete restore. This overview includes who each product is best for, and why it stands out in the market.
| Product | Best For | Why It Stands Out |
|---|---|---|
| UMI Performance 301417-R | Street and mild track use | Red tubular design; includes lower arms; proven fit for 1978-88 GM G-Body |
| AngyMeck Rear Upper & Lower Kit | Complete rear refresh | Exact G-Body fitment; includes both upper and lower arms; OEM cross-reference |
| UMI Performance 302717-B | Dual-adjustment needs | Rear double adjustable upper and lower; black finish |
| UMI Performance 78-88 G-Body Rear Lower & Adjustable Upper | Simple upgrade | Lower arms with adjustable upper; compact option |
| UMI Performance 301417-B | Black coating option | Similar to 301417-R with black finish; tubular lower arms included |
| Massive Speed System 6 Color Red UCA Kit | High-end race build | All-metal heavy-duty; 1/4″ boxed bracketry; billet tie rod |
| maXpeedingrods Rear 4 Link Kit | GM A-Body and related chassis | Adjustable arms; polyurethane bushings; track and street |
UMI Performance 301417-R GM G-Body Rear Adjustable Upper and Lower Control Arm Set – Red
The 301417-R kit targets the GM G-Body platform from the late 1970s to late 1980s. It is designed for users seeking a direct, durable update to rear suspension, with tubular lower control arms included. This option is best for street-driven builds that value a clean, red-coated appearance and straightforward installation. Best for enthusiasts who want a complete rear-arm refresh with a noticeable improvement in rigidity.
Who it’s best for: Street-to-light-track drivers needing reliable, bolt-on improvement without custom fabrication. Why selected: It pairs adjustable upper and lower arms in a single red package, simplifying upgrades for 1978–1988 GM G-Body cars. Caution: Availability of exact mounting hardware may vary by year and sub-model; verify compatibility before purchase.
AngyMeck Rear Upper & Lower Trailing Control Arms Kit
This kit is a comprehensive rear suspension refresh for G-Body platforms, including both upper and lower trailing arms. Designed to fit 1978–1988 GM configurations like the El Camino, Regal, Grand Prix, Malibu, Monte Carlo, and Cutlass, it aligns with OEM cross-reference numbers 568-8985 and 568-9062. Best for restorations where a full rear-arm swap is desired and precise fit is essential.
Who it’s best for: Restorers aiming for a complete rear suspension overhaul with factory-equivalent fit. Why selected: It covers both arms and is engineered to meet original specifications, reducing install friction. Caution: Some users may require minor frame prep if rust is present on older vehicles.
UMI Performance 302717-B GM G-Body UMI Perf Rear Double Adj Upper and Lower Control Arm Set – Black
The 302717-B offers double-adjustable rear control arms for the G-Body, finished in black for durability and a stealth look. This set is suitable for users who want fine-tuned suspension geometry, including camber and toe adjustments, to optimize handling on both street and track conditions. Best for enthusiasts who value precise alignment capability and a sturdy build.
Who it’s best for: Performance-minded drivers who set up track-ready alignment. Why selected: Separate adjustability in upper and lower arms enables more precise tuning than fixed arms. Caution: Dual adjustable hardware can be more complex to install; verify tool needs and alignment procedure.
UMI Performance 78-88 G-Body Rear Lower Arms & Adjustable Upper Arm
This option blends a fixed lower arm with an adjustable upper arm for the G-Body era. It provides a simpler upgrade path for owners who want to improve rear-end stiffness and responsiveness without a full double-adjustable setup. Best for budget-conscious builds that still require a notable handling upgrade.
Who it’s best for: Budget-focused enthusiasts upgrading a single-arm system. Why selected: Combines a non-adjustable lower arm with an adjustable upper arm, reducing cost while enhancing geometry. Caution: If full adjustability is desired, a complete double-adjustable kit may be preferable.
UMI Performance 301417-B GM G-Body Rear Adjustable Upper and Lower Control Arm Set – BLK
The 301417-B mirrors the 301417-R in design and purpose but offers a black-coated finish. It includes tubular lower control arms and targets the same 1978–88 GM G-Body range. Best for drivers who want the same performance upgrade but with an alternative color option to match under-hood aesthetics or existing hardware.
Who it’s best for: Owners preferring a black aesthetic with the same performance characteristics. Why selected: Provides a consistent upgrade path for G-Body suspensions with a different visual finish. Caution: Finish wear can occur on aggressively driven cars; regular inspection is advised.
Massive Speed System 6 Color Choices RED RaceSpec Adjustable Rear Upper Arms
This kit is aimed at high-performance builds with a focus on strength and adjustability. It features fully boxed 1/4-inch steel bracketry and large-diameter tie rod technology, designed to resist twisting under high torque. Best for those building or restoring a race-oriented G-Body where durability is critical.
Who it’s best for: High-horsepower applications and race-oriented builds. Why selected: Heavy-duty construction and billet components provide edge-to-edge strength. Caution: Taller parts may require extra clearance checks and professional alignment for some chassis setups.
maXpeedingrods Rear 4 Link Kit for GM A-Body
This kit is designed for GM A-Body but offers a compatible approach for some G-Body projects seeking an adjustable, four-link setup. It includes adjustable upper arms and greaseable polyurethane bushings aimed at improved handling and immediate response. Best for builders who want track-level feel in a streetable form factor.
Who it’s best for: Builders pursuing a track-ready feel with a flexible rear-link system. Why selected: Offers adjustable geometry with durable polyurethane bushings for consistent performance. Caution: Not a direct G-Body G-platform match; verify fitment for your specific vehicle.
Buying Guide
What should you consider when buying G-Body rear upper control arms?
- Fitment: Confirm year range and model compatibility (Monte Carlo, Regal, Malibu, etc.). Some kits claim broad G-Body coverage but may exclude certain sub-models.
- Adjustability: Decide if you need a fixed, single-adjustable, or double-adjustable setup. Double-adjustable arms offer finer alignment control but can be more complex to install.
- Material and Construction: Look for tubular arms, boxed bracketry, and polyurethane bushings for durability and updated rigidity. Graduated finishes (red, black) can help with under-hood aesthetics and corrosion resistance.
- Installation and Tools: Some kits require alignment after installation. Check whether OEM cross-reference numbers are provided for a smoother swap.
- Intended Use: Street driving vs. track days. Higher-end kits typically target increased stability and handling at higher speeds, while budget kits improve comfort and reliability for daily use.
- Finish and Color: Finishes like black or red can be visually matched to existing hardware but do not affect performance; choose based on preference and corrosion considerations.
Frequently Asked Questions
- What is the primary purpose of rear upper control arms on a G-Body?
They help set rear suspension geometry, affecting alignment, handling, and stability during cornering and acceleration. - Do I need a full set with both upper and lower arms?
For the best balance and alignment, a full set is recommended, especially on restoration or performance builds. - Can I install these parts myself, or should I seek professional help?
Basic installations can be DIY with proper tools; more complex adjustable systems or distorted frames benefit from a professional alignment. - Will these arms fit my 1978-1988 GM G-Body?
Most products target 1978–1988 GM G-Body models; verify year, sub-model, and cross-reference numbers before purchase. - Are these arms compatible with stock exhaust and suspension components?
Compatibility varies by kit; confirm interference with exhaust, shocks, and sway bars during fitment checks. - Do these kits improve street ride quality or only performance?
Many kits improve both handling and ride response, but the level of improvement depends on overall suspension setup and alignment.