speedometer off

[oleanclasscars]

We have a 1989 Corvette that the gear was changed in the rear end. The original gear set was 355, the new gear set is 256. Now the speedometer is off. I have heard a few different solutions to my problem. One is a new Prom for the ECM. Another is either a brac module or a drab module. I have not been able to find any of these things anywhere. It is an digital speedometer. Can anyone help me?

 

[JT ZR-Won]

When I had the gear changed in my '85, I ordered speedometer recalibration gears also. I got them from Summit Racing. They are 2 nylon gears. They'll ask you which gear you have to make sure you're getting the right one. I know one of the gears goes in the trans if it's an automatic.

Jay