Car dog-tracks / axle looks shifted
Measure rear centering and panhard geometry at final ride height. Check bent/misaligned mounts before adjusting around the problem.
MODIFIED CAR · REAR SUSPENSION
Modified-Car Rear Suspension Diagnosis
Diagnose the car that exists today. A new vibration, bind or tire rub after a modification is configuration evidence.
APPLICATION: Modified 1993–2002 Firebird / Formula / Trans Am.
MODIFIED-CAR / AFTERMARKET EVIDENCE · VERIFY INSTALLED HARDWARE
New vibration after torque arm/rear swap
Check pinion/driveshaft relationship, mount position, driveshaft length/yoke engagement, fastener torque and exhaust contact before blaming the transmission or differential.
Rear bind / harshness / snap
Inspect joint type, bushing preload, articulation and bracket alignment. Solid/spherical joints can transmit more NVH; binding from misalignment is not a normal performance tradeoff.
Tire rub after lowering
Separate axle-centering error from wheel offset, tire width, body interference and dynamic suspension travel.
DO NOT CHANGE THREE ADJUSTERS AT ONCE
Record ride height, panhard length, torque-arm/pinion setting and LCA hole positions before changing anything. Make one controlled change and re-test the original symptom.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. Do not turn a symptom, DTC or catalog fitment label into a parts order.