Whats the biggest size engine i could put in my 04 grand prix gtp ???


Asked by May 05, 2015 at 05:06 PM about the 2004 Pontiac Grand Prix GTP

Question type: Car Customization

Where about to get another vehicle so I can finally start my project on my 04 grand prix gtp and I`m wondering whats the biggest engine I could fit in it and whats the best transmission I should pair it up with?? thanks for the help

4 Answers

Dorian Hendricks

You can swap in a 5.3L LS4 V8, which came in the Grand Prix GXP, paired to the 4T65E-HD, but with anything more powerful, you will have a hard time keeping traction because it's front wheel drive and weight transfers to the rear when you accelerate. If you want more power, trade the Grand Prix for a rear wheel drive vehicle, such as a Corvette, Camaro, GTO, or G8. It will be more fun.

Best Answer

I know the 04 gtp has a 4t65e tranny not sure if it is HD ...do you know if it is???

Dorian Hendricks

I think the 2.93:1 MN7 4T65E-HD trans came in both the supercharged GTP and the V8 GXP.


Ok cool thank you ...i recently got the trans rebuilt and they beefed up the internals some ...... do you know if same motor mounts would work or would new ones be needed?

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