MK3 Supra Adjustable Control Arms: Fitment and Selection

Define the job the product must do

The MK3 Supra uses double wishbone suspension front and rear, so each corner has several arms, and most aftermarket arms correct one specific adjustment. Lowering springs or coilovers change ride height, which changes arm angles and often adds negative camber, with the rear being a frequent complaint on lowered cars. If your alignment shop reports that rear camber is out of range and the available factory adjustment cannot bring it back, adjustable rear upper arms are the usual starting point. If the concern is toe, the toe link is the part to examine instead. Buying arms for every position without a measured reason adds cost and more joints to maintain.

Be clear about how the car is used: a daily driver on rough roads, a weekend car for twisty roads, or a dedicated track car each points toward different joint types. Also rule out worn parts first. On a car of this age, tired factory bushings, loose ball joints or sagging springs can produce alignment problems that look like a geometry issue. Have current alignment readings and an inspection of joint play at every arm in hand before you shop.

Check compatibility

Confirm that the listing names the A70-chassis Supra and the exact arm position: front upper, front lower, rear upper, rear lower or rear toe link. Some arms are side-specific, so check whether the kit covers both sides. Vendors sometimes list related Toyota chassis as well; treat any cross-fitment claim as something to confirm with the seller rather than assume. Check whether the arm uses the factory mounting points and original hardware or ships with new bolts, sleeves and washers. At the front, the upper arm meets the steering knuckle through a ball joint, so confirm whether one is included and that it is specified for the A70 knuckle.

Clearance is the other half of fitment. Wider or lower-offset wheels, aftermarket brake calipers, larger-bodied coilovers and anti-roll bar links can sit close to an arm that is thicker than stock. Ask the seller for the adjustment range relative to factory length, and compare it with your alignment readings and intended ride height. An arm whose range barely reaches your target leaves no margin for future changes.

Features that affect the choice

Joint type shapes how the car feels and how much maintenance it needs. Rubber bushings are the quietest and most compliant but allow some deflection under load. Polyurethane bushings are firmer and hold geometry more tightly, though they can squeak and may need periodic lubrication as the maker directs. Spherical bearings, whether rod ends or pressed-in units, remove almost all deflection but pass more noise and vibration into the cabin and tend to wear faster when exposed to water, grit and road salt. Boots or seals help, but they do not make a spherical joint maintenance-free.

Adjustment design matters during alignment. A turnbuckle-style body with left- and right-hand threads can be lengthened or shortened on the car, which saves time and shop labor. Designs threaded at one end only require disconnecting that end for each change. Jam nuts must lock the setting securely, and the instructions should state minimum thread engagement. Material and finish also count: steel and aluminum arms both work, but in a wet or salted climate the corrosion protection and the ability to free the threads years later matter more than a weight figure.

Separate evidence from marketing. Labels such as race-proven or lifetime quality say little on their own. Useful evidence includes a published adjustment range, the specific bushing or bearing type, availability and price of replacement joints, information about the hardware supplied, written installation instructions and warranty terms you can read before buying.

Limitations and ownership costs

Adjustable arms cannot fix worn bushings in other arms, damaged or corroded mounting points, bent components or sagging springs, and they do not replace a professional wheel alignment. Budget for an alignment immediately after installation and possibly another after new springs or bushings settle. The correct camber, toe and caster settings depend on the factory specifications, your ride height and how you drive, so take them from the service manual and a qualified alignment technician rather than from forum figures.

Installation starts with safe vehicle support: work on firm, level ground, chock the wheels that stay on the ground and place rigid stands under the lift points the service manual specifies. Never work under a car held only by a jack. Bolts passing through rubber bushings are commonly final-tightened with the suspension loaded at normal ride height to avoid preloading the bushing; follow the service manual and the kit instructions for tightening sequence and fastener specification. Seized hardware is common on older cars, so plan for penetrating oil, extra time and possibly new bolts.

Ongoing costs come from consumable joints. Check joint play and boot condition at regular service intervals, confirm jam nuts remain tight, and recheck the alignment after a hard pothole or curb strike. Ask the seller what replacement bushings or bearings cost before you commit, because that price recurs over the life of the car.

Build a practical shortlist

Compare every candidate on the same points: confirmed A70 fitment for the exact arm position and side; an adjustment range that covers your measured need with margin; a joint type that suits your driving; on-car adjustability; included hardware and, for front upper arms, ball joint details; corrosion protection suited to your climate; replacement parts availability; written instructions; and clear warranty terms. Add clearance with your wheels, brakes and coilovers as a final check.

Drop any option whose seller cannot confirm fitment or adjustment range in writing. From what remains, choose the arm that solves your measured problem with the least added noise and maintenance for your use. Share the shortlist with your alignment shop before ordering, since the technician who will set the car up can confirm whether the range and adjustment method suit the work they need to do.