hi, i installed a 4.3 GTUs differential into my Series 5 GXL, when i revv it high, it seems like it doesn't make power at almost redline. i was wondering is the shifting points have changed now with a 4.3 diff? right now my speedometer doesn't work so i can't tell what speeds i'm going so if any of you guys have experiece with this, what would be a good point to shift if it's different than a 4.1 diff? My car is stock power wise and i have 205/45/16s, thanx.

 

Shift points depend on the output of the engine and should remain unchanged after a differential swap.