My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

UMI Performance 3039-B Upper Control Arms for GM 12-Bolt Rear End Swap G-Body

(1978-1983 Chevrolet Malibu; 1978-1988 Pontiac Grand Prix; 1978-1981, 1988 Pontiac LeMans; 1978-1988 Buick Regal; 1978-1981, 1985-1988 Oldsmobile Cutlass)

Manufacturer

Picture for manufacturer UMI Performance

Part Number

3039-B
5 reviews
Sale Price

$279.70

Estimated ship date Saturday, November 28

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The UMI Performance 3039-B upper control arms are engineered specifically for installing a 1964-1972 GM A-Body 10-bolt or 12-bolt rear end into 1978-1988 GM G-Body vehicles, including Monte Carlo, Malibu, El Camino, Regal, Grand National, Grand Prix, and Cutlass models. These control arms are built at the correct angle to properly attach to both the G-Body chassis and A-Body rear end mounting ears, eliminating the dangerous rear end bind and incorrect driveline angles that occur when using factory control arms.

Key Features:

  • On-car adjustable design for easy pinion angle correction and installation fine-tuning
  • Aircraft-quality 4140 heat-treated chromoly adjuster for maximum strength and durability
  • Spherical Roto-Joints installed for unrestricted rear end movement during high-performance handling
  • 4140 chromoly threaded tube adaptors ensure long-lasting thread integrity
  • Mounting plates CNC-machined from 0.250-inch thick mild steel
  • Professional TIG-welded construction throughout
  • Durable powder coat finish for corrosion resistance and appearance
  • Uses OEM hardware for straightforward installation
  • Ships fully assembled and ready to install

These upper control arms are essential for any A-Body to G-Body rear end swap, preventing traction loss, driveline vibrations, and unsafe handling characteristics. The spherical Roto-Joint design allows proper rear suspension articulation for autocross, road racing, and drag racing applications while eliminating bind that robs performance and creates safety hazards.

Products specifications

Fits

1978-1983 Chevrolet Malibu; 1978-1988 Pontiac Grand Prix; 1978-1981, 1988 Pontiac LeMans; 1978-1988 Buick Regal; 1978-1981, 1985-1988 Oldsmobile Cutlass

Ball Joint Included

No

Bushing Material

Spherical bearing/Delrin

Bushings Included

Yes

Control Arm Finish

Black powdercoated

Control Arm Style

Fully adjustable

Notes

One end has a Roto-Joint.

Quantity

Sold as a pair.

At first I was hesitant to place the order since shipping/handling fees are not disclosed until quite late in the process, however once I learned the shipping charge I was relieved that it was quite resonable.

Autoplicity simply had the best prices available and everything was in stock to be shipped.

Ordering process was quick and easy although I was not able to get payment to work through pay pal. In the credit card window, it say select form of payment. Was not able to get it to go to pay pal.

Easy payment method

No problems ordering a leak down tester from Autoplicity which had the lowest price and reasonable shipping charges. The item was well packaged and I would buy from them again.

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy