Transmission Change

[walkure]

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.

[Swiggles]

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

[SgtMarshal]

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

[Swiggles]

The link I have for that isn't working anymore either.

[walkure]

Thanks, I'll give that a try.