getting ready to take on the project...going from a 85mph to a 145 unit in my 85 iroc.do i need to change the speedo gear in the tranny.if so where would i find one??305 tpi 700ra 3.23 rear?thanks

 

Straight swap. Instead of swapping entire clusters, however, I'd recommend swapping only the speedo heads (providing your original cluster works as designed). No need to change the drive or driven gears in the trans unless you've traded rear ends. Check the following link for more info:

https://www.thirdgen.org/forums/faq-...-fix-pics.html

JamesC

 

iv recently swaped a 3.23 posi for my old one tire fire(ratio unknown?)where could i get a different gear?thanks

 

http://www.transmissioncenter.net/sp...n_______va.htm

JamesC