Okay, I found a donor car to put my valvetrain in. Its a 2002 GP GT. Now my current transmission is a stock GTP unit with a shift kit. I was wondering if it was alright to use the GT transmission seeing as it already has the gearing that I want. My plan is to refresh it and put in some hardened parts. Or should I keep my GTP trans and refresh that with new gearing? Please give me some words of wisdom, thanks alot.

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1997 Grand Prix GTP

2.8|XP|W body IC|42.5 inj|TOGS|Ported M90|Ported Heads|N*TB|AEM WB|

I'd say go with the younger trans. The only differences are the torque converter size and the differential.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

I forgot about that... might be nice for him to have the higher stall converter. We could easily swap the diff from his other car if it looks good when we take it out, so thats no big deal.

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Dark Teal 97 GTP - 3.69 tranny - 2500 stall - XP cam - 130# springs - Ceramic ZZP Z7 62-1 - air to air intercooler with Turbonetics Raptor BOV - 72mm ported stock throttle body - 65# injectors - Autolite 103s - custom 3" exhaust

Either way it isnt really going to matter much if you plan to go through the GT trans. As mentioned above other than the gear the differential and converter are really the only main differences between the two and all other internals are the same. If the GT trans looks to be in better shape then I would use it and go ahead with your plans to upgrade it.

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