Just changed my rearend gears to 4.10 now i need to fix speedometer.

[jhong321]

Hi I just change my rear end gears to 4.10 and need to know what I have to do to get the correct reading for my speed this was done on a 1990 ZR1. I know alot of you have done this can you tell me how? Thanks

 

[Demps]

An analog interface correction, a digital interface correction, or new VSS gears. If you are staying with 4:10s, the gears are the easiest. If you think you will change gears, splicing in a digital interface correction container will be the best.

Lingenfelter used to be the only ones that had the correction gears. Marc Haibeck (www.zr1specialist.com) might sell them separately now. The VSS is in the rear of the tranny on the driver's side. I think the gears must be 13 & 43 teeth to correct the closest for 4:10s.
Ted

 

[jhong321]

Thanks For the info.