2005 Pontiac Grand Prix GTP transmission

Asked by Edward Aug 21, 2022 at 11:40 PM about the 2005 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

Why is only another 2005 GTP 4t65-hd transmission
compatible?

1 Answer
2,170

Guru9R9KBS answered 2 years ago

Probably because it was developed to only handle the extra HP and TQ in the 3.8L supercharger engine it is mated to.

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