Relocating the rear differential 1.25” towards the rear of the vehicle on a 72 Dart

Heywodja said

Going to call Calvert Racing in the morning and check into a mono-leaf setup with caltracs.

Not too sure about how it will behave on the street.

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It will be fine. The avatar has that setup with the split mono springs. Noisy? Mine make a noise on part throttle 2-3 shifts on the street but that's all I ever hear. Deep throttle, the engine is LOUD so you don't hear anything from the suspension!