My son and I just bought an 89 IROC Z28 with a ZZ4 crate engine in it. It runs real nice. I have one problem I need to correct. The previous owner put in a 3.73 rear. Since he did that the speedometer is not correct. I need to know what speedo gear I need to purchase and install in the 700R4 transmission to correct this problem. Part Number and gear size would be very help full.

Is there any thing else I should look at while correcting this problem?

Thank You,

Dane R. Marley
Wynnewood, PA
610-299-6360
danermarley@aol.com