You need to make sure the replacement will be a direct bolt in. You may need to also replace the driveshaft as well. Any modifications to the driveline can have dire results if everything is not "squared" up.

You need to be careful with the gearing as well, and you will need to get the speedo recalibrated. Also, it can affect your fuel milage and drive train wear. Higher gearing makes the rear wheels harder to turn, which puts more stress on your u joints and transmission, lower grearing makes the engine rev faster to go say 70 mph, than your current diff does, which makes the engine work harder.

Pro for higher gearing is fuel savings once up to speed. Engine has lower RPM. Pro for lower gearing is more grunt at take of from a dead stop.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

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