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From Another C3 Forum:

"I recently installed a TH700R4 from a 1990 Chevy van and now my speedometer doesn't read correctly. Can some of you guys chime in and help me get my speedometer reading correctly? Thanks in advance".


Here's just one of the several websites that can walk you through the gear selection process. You'll need to know your tire diameter and rear end ratio ahead of time so you can plug those figures into the formula. Scroll down to the "TH700R4 How To video" and it'll tell you everything you need to know:

 
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