1998 V6 - Want to Change Rear Gear Ratio
I’m looking at swapping out my 3.08 open rear axle (1998) with a 3.42 LSD out of a Y87 car (2000). I’ve read online that you need to have the PCM reprogrammed after changing the gears to correct the speedometer and transmission shift points. But when I called the local Chevy dealer today, they insisted that that information can’t be updated in the PCM.
Have I read bad information, or do the service guys at this dealer not know what they’re talking about?
Has anyone here done this kind of swap? How did you handle the speedometer and shift points?