Well first have all.. do they have the same tranny??

If they do.. which is better? GXP or the GTP differential? Or are they the same thing? I was just thinking of this when I was looking at the ZZP upgrade kit.

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Why have more money than brains? Cuz RACE CAR :

they are 4T65-HDs

the GXP trannys that have ben replaced under warranty may have a single chain other then that they are the same. the cases are diffrent though i think they can bolt to a 3800 but have not had them side by side to compare

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Like 01gpgt said they should be the same but there might be some difference's inside the trans. Like bigger clutch's better hard parts and what not.

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Modded Like a Mother Fu**er and still gets 20+ mpg and runs 14's