sal3800 SE
Joined: 03 Jan 2007
Posts: 3
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| ???? tranny |
Posted: Sun Mar 11, 2007 11:52 pm |
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what tranny does a 99 pontiac grand prix GT have an what is a HDconversion on the tranny an wut does it benefit ?? |
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streetracer Site Admin

Joined: 18 Sep 2005
Posts: 933
My Vehicles: 1998 Pontiac Grand Prix GTP |
| (No subject) |
Posted: Thu Mar 15, 2007 9:52 am |
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Sorry I missed this post.
The GT has the same tranny as the GTP EXCEPT
GT has 3.29 gears and the GTP has 2.93
GTP has a better differental (HD conversion)
To do a HD conversion you would need.
GTP diff, GTP diff cover, output shaft, and the GTP passanger side CV shaft.
IF your making a bit of power (over 275 FWHP) then it would be a good idea to do. |
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sal3800 SE
Joined: 03 Jan 2007
Posts: 3
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| Re: ???? tranny |
Posted: Fri Mar 16, 2007 1:36 am |
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oh so i would be able to put a gtp tranny as long i upgrade the differencial ??
an thank a lot man !!! |
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streetracer Site Admin

Joined: 18 Sep 2005
Posts: 933
My Vehicles: 1998 Pontiac Grand Prix GTP |
| (No subject) |
Posted: Fri Mar 16, 2007 7:44 am |
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you would also have to change the gearing in the PCM |
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Matthe55 SE

Joined: 18 Aug 2010
Posts: 8
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| Re: ???? tranny |
Posted: Tue Aug 24, 2010 2:26 am |
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