Originally Posted by PROPEL
Chris, my transmissions are GT-specific, so they are already calibrated for 3.89s. Perhaps we could use a broken one as a starting point?
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Here is the thread where I got the ratios from
http://www.opelgt.com/forums/mechani...html#post65797
So did the GT come with 4.11 or 3.89? I know I have one GT and one Kadett