Whats involved in changing the rear gears on the Impala SS?
Basically, you will need to change the gears, get the PCM reprogrammed for them, and change the ABS reluctor. For 3.42’s and steeper, you can use GM reluctors for the B-bodies. For 3.73s and lower, you’ll need an aftermark et shop like Evergreen Performance or Ligenfelter, or you can get P/N 26018946 (about $7.00) which is the reluctor used on the ’91-’92 Cadillac D-body (Fleetwood Brougham) with the V4P 7,000 lb. trailer towing package. You’ll also need to have either the Goodwrench staff reprogram your PCM (which they seem to be unwilling or unsure of how to do) or purchase a new PCM program that allows you to change this. The Hypertech device lets you change it dynamically. If you are looking for something larger than a 3.73, the small block equipped light duty 2500 series trucks have a 8.5″ diameter 10 bolt ring gear and are available with the 4.10 ratio. Before the introduction of the Vortec engines in the C/K truck line, the 8.5″ 4.10 ratio had slightly greater availability. So y
