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Old 03-25-2007, 05:34 AM   #1
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Default Changing rear end gears in the gxp

I know this is easy in fords with the 8.8 rear end, my mark8 had 4.10'* in the rear and they were nice. How hard/easy is it to change gears in the gxp? can it be done? I am sure it would screw up the shift points and you can't get a chip for the car, so it may not be easy. Anyone have any input?
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Old 03-25-2007, 10:31 AM   #2
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You're talking about the Bonneville GXP? They're FWD, not RWD.
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Old 03-25-2007, 11:06 AM   #3
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ignore teh useless post above....


In theory the final drive grear ratio could be changed; the GXP already has a very aggressive ratio. However, without PCM support it may not be do-able due to shiftpoints unless a kit exists somewhere for a differently toothed speed sensor reluctor(?) wheel

do a google search about 4t80e performance parts and maybe you could dig something up, also i would look into caddilac forums for better 4t80e support
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Old 03-25-2007, 11:26 AM   #4
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Quote:
Originally Posted by toastedoats
ignore teh useless post above
WTF Toasty... you look like a jerk with this statement??????

There are no rear end gears in a GXP, however final drive and other ratio'* could be changed.
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Old 03-25-2007, 11:57 AM   #5
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However, there is NO PCM support. This is a big factor.

No more bitchfesting. The best we can do is explain the difficulties in making it work, I don't think we can really do much to help you find a different ratio. Until the PCM is cracked (not likely to ever happen) this won't work well.
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Old 03-25-2007, 12:44 PM   #6
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And I believe that the GXP has a 3.71 Ratio?

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Old 03-25-2007, 01:24 PM   #7
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Quote:
Originally Posted by jr's3800
And I believe that the GXP has a 3.71 Ratio?
you are correct
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Old 03-26-2007, 03:39 PM   #8
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Default Changing Final Drive Gear Ratio

Is the GXP transaxle the same unit used in the 3.8s or is it a Caddy / Olds unit adapted to the Bonnie?
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Old 03-26-2007, 03:43 PM   #9
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caddy/ olds trans - 4T80E
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