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Transmission Change

walkure

walkure

New member
My stock gt trans is finally done after 245k miles. So I plan to swap to a spare gtp trans that I have sitting around the shop. I have HPTuners v3.0 and I believe that I only need to change the Drive Sprocket Ratio under the speedometer tab from 1.000 to 1.121. Is there anything that I need to change under the transmission tab? I am new to tuning and could use all the help I can get. Car is a '99 GP GT.
 


Compare a your gt file to a gtp file and copy all the trans stuff over and the speedo might have other differences change whatever isn't the same
 
there used to be a good guide on changing the transmission gear ratio using hp tuners that trannyman (TEP) made, but last time I looked for it, it was awol. I would do what swiggles suggested, and maybe send TEP an email and see if he has instructions on doing it
 
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