Housing-specific hardware
UMI's tunnel-mounted torque arm documentation calls out different rear hardware for a Moser Engineering 12-bolt versus other supported housings.
PERFORMANCE · TORQUE ARM · REAR AXLE
Torque Arm vs Rear Axle Compatibility
The chassis application does not prove the rear-housing mount and hardware are the same.
APPLICATION: Modified 1993–2002 Firebird / Formula / Trans Am with factory or aftermarket rear axle.
Pinion-angle adjustment
Aftermarket torque arms commonly add on-car pinion-angle adjustment. That adjustment must be set for the actual transmission mount, ride height and driveline—not copied from another car.
Rear swap cascade
A rear-axle swap can also change brakes, parking brake, ABS/TCS sensing, driveshaft/yoke and wheel clearance. Torque-arm fit is only one gate.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. Do not turn a symptom, DTC or catalog fitment label into a parts order.