hello again,just installed new transmission in my 1987 iroc,wc t5 1352-176 tag number.the trans i took out was a 14 spline v6 trans 1352-181.the speedo if off about 20 miles per hour(faster).i know this thread has been beatin into the ground but need alittle help.the trans ratio is t5u 2.95,1.94,1.34,1.1,.63.rear end is a 3.45 ratio.thanks

 

All your answers are in the very first post of this thread: https://www.thirdgen.org/forums/tran...ve-driven.html