changed gears/mph is way off

[crazycat]

Hi I installed 4.10 gears , now my mph is way off. I know the older cars you could change the little gear on the transmission. this car is electronic, what is the best way to fix this. I have a 95 z28. thanks p.s I called jegs he said I would have to go to a transmission shop.....

[RATA5.7]

What you can do is go to jegs or summit racing and buy a programmer and you will be able to custom tune your ocm for 4.10's.

[RATA5.7]

pcm not ocm

[crazycat]

Ok will do. thanks....

[cobrahunter]

My speedo was off by about 10mph after I installed the 4.10s.

[preston1980]

hypertech power programmer 3

It will fix your speedo, plus give you more horsepower and much more for around 300$ on all f-body cars from 94-02
They just plug in under your steering wheel, its easy

WS6store.com, for all your LS1/LT1 needs, they rock