Hey i have a 95 cat, with the 3.8, Im doing a 8.8 upgrade rear end with 410 gears, I knw i need to get a chip to fix my shift points and speedometer, is there ne thing else i will need to get to make it perfect.
You'll haveta change the gear for the speedo. It's a sensor that plugs in the tailshaft of the transmission. Going to 4.10s will probably put you at the highest tooth count gear there is (23t I believe) and that gear isn't claimed to last a long time.
4.10s are awfully steep for the street. But in a NA 3.8 would probably be ok.