you can buy a hypertech programmer or a superchips programmer for about $300-350. The other thing you can do is go down to a local Dyno shop and they can reprogram the computer for you ($100-200). Last option is get ripped of by having the dealer do it. I pesonnaly recommend getting a programer and making the adjustments yourself. There is also other things you can tweak while your at it. I went from an open dif with 3:42's to a posi with 4:10's (auburn gears).
Doc,
> I've got a '95 that originally came with a 3:42 rearend, which I
> replaced with a 3.73 ring and pinion when I replaced the ring and
> pinion. (Actually the truck did it itself at 145k miles when I lost a
> single pinion tooth, but I went ahead and correctly upgraded
> afterwards :) ) Since I'm not OBDII, how do I go about reprogramming
> the computer to calculate milage correctly? Its a z71 with an
> aluminum 5 spd. thanks!
> Adam