Thread: 2006 GXP Trans into 2004 Comp G: Possible?

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  1. #1 2006 GXP Trans into 2004 Comp G: Possible? 
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    OK, so I have a 2004 Comp G that I believe has lost the forward apply band. A local JY just got in a 2006 GXP, looks to be wrecked. Will the transmission from that vehicle work in my car with minimal modification? I can get the computer tuned for the 2.93 gear ratio since mine is 3.29.
    2005 Pontiac Grand Prix GXP - Bleen Machine
    1991 Pontiac Grand Prix GTP -- 5-speed Getrag 284 - Blown transmission, rebuilding.
    1996 Pontiac Firebird Trans Am - LT1/T6
    Notice a trend??
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  2. #2 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    I break things. WarStryker13's Avatar
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    As long as the GXP had tap-shift, it shouldn't be too big of an issue, IIRC the axles were different but you could always grab those as well.

    The gear ratio will make it feel much slower, but it'll be driving again at least. Lol

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  3. #3 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Will not work, ever.

    The GXP transmission case if for GXP onlys. The starter location on the bell hosuing is completely different and can't work on a 3800.

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  4. #4 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    I break things. WarStryker13's Avatar
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    Ah... Forgot about the starter. My bad. Lol

    The internals would still be worth pulling the trans, though... Right? ;D

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  5. #5 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    GXP Level Member Turbocharged400sbc's Avatar
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    yes it will work I had one in my comp G for a little while till it got the built trans from Triple Edge performance.
    I gave Dave the GXP trans for a core when I picked it up
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  6. #6 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    I break things. WarStryker13's Avatar
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    Well that settles it. Lol

    I trust James.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  7. #7 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    GT Level Member atj8's Avatar
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    With some time and elbow grease it can work. Hell im taking a rebuilt impala trans and swapping over my comp g internals and adding some harden parts for my turbo car.
    98 GTP Gen v 2.8,FSIC,xpcammed,SD headers,CAI,CORNFEED,TIMBOKU TUNED
    04 Comp-g Turbo,Cornfed, TIMBOKU tuned
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  8. #8 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    Quote Originally Posted by Turbocharged400sbc View Post
    yes it will work I had one in my comp G for a little while till it got the built trans from Triple Edge performance.
    I gave Dave the GXP trans for a core when I picked it up
    I am buying the trans on Saturday, so if you can share specifics on what I need to modify, I would really be in your debt. Thanks!!
    2005 Pontiac Grand Prix GXP - Bleen Machine
    1991 Pontiac Grand Prix GTP -- 5-speed Getrag 284 - Blown transmission, rebuilding.
    1996 Pontiac Firebird Trans Am - LT1/T6
    Notice a trend??
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  9. #9 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I'm curious too, even trannyman dave has said the LS4 has a different case for the starter location.

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  10. #10 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    I break things. WarStryker13's Avatar
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    I'm curious as well... This might be an extra option for some of us.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  11. #11 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    I'm really hoping it is a simple fix - we just got a GXP in at our LKQ and I can get the trans for $100. Otherwise I have a line on a known good Comp G trans for $150 but I have to drive 9 hours to get it.
    2005 Pontiac Grand Prix GXP - Bleen Machine
    1991 Pontiac Grand Prix GTP -- 5-speed Getrag 284 - Blown transmission, rebuilding.
    1996 Pontiac Firebird Trans Am - LT1/T6
    Notice a trend??
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  12. #12 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    GXP Level Member Turbocharged400sbc's Avatar
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    I will tell you that the GXP starter boss without a starter attached easily cleared the zzp headers.
    are starter mounts to the block below where the LS4 does you just end up with an opening right there... call it the broken flexplate inspection window for all I care.
    there were no wiring issues or anything it was Plug and Play
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  13. #13 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    So we can put it this way.

    GXP to GT/GTP is okay to swap.

    But GT/GTP to GXP is not okay because the starter position is totally different and the regular 4T65e case wouldn't work.

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  14. #14 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    yeahi couldn't see what issue a starter boss in the bellhousing would interfere with on a 3800.....almost wonder if you can use the ls4 starter too....
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  15. #15 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    So we can put it this way.

    GXP to GT/GTP is okay to swap.

    But GT/GTP to GXP is not okay because the starter position is totally different and the regular 4T65e case wouldn't work.
    starter position is roughly the same....how it attaches is dif
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  16. #16 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    Quote Originally Posted by Turbocharged400sbc View Post
    I will tell you that the GXP starter boss without a starter attached easily cleared the zzp headers.
    are starter mounts to the block below where the LS4 does you just end up with an opening right there... call it the broken flexplate inspection window for all I care.
    there were no wiring issues or anything it was Plug and Play
    THANK YOU! Definitely grabbing it. Now that I know that, I get to start worrying about what issues I will have electrically and mechanically. Ugh. Maybe I will swap all the sensors from my current trans over since they all worked fine and no codes at all were thrown about the trans. Cheap insurance, I'd wager. Or I'll have the guy working on it test them if that's even possible.

    Thanks everyone for the quick responses. Saved me some headache and a trip to NY!
    2005 Pontiac Grand Prix GXP - Bleen Machine
    1991 Pontiac Grand Prix GTP -- 5-speed Getrag 284 - Blown transmission, rebuilding.
    1996 Pontiac Firebird Trans Am - LT1/T6
    Notice a trend??
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  17. #17 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    GXP Level Member Turbocharged400sbc's Avatar
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    to be clear....I have not tried oem manifolds/flanges, pacesetters have loose flanges that can be clocked, the zzp headers have nothing in that area as its a slip connection under the TB for their crossover pipe plumbing

    but at most id say youd have to hit it with a grinder
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  18. #18 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
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    Quote Originally Posted by Turbocharged400sbc View Post
    to be clear....I have not tried oem manifolds/flanges, pacesetters have loose flanges that can be clocked, the zzp headers have nothing in that area as its a slip connection under the TB for their crossover pipe plumbing

    but at most id say youd have to hit it with a grinder
    If I had the extra money I'd totally convince my wife that I need headers now. XD
    2005 Pontiac Grand Prix GXP - Bleen Machine
    1991 Pontiac Grand Prix GTP -- 5-speed Getrag 284 - Blown transmission, rebuilding.
    1996 Pontiac Firebird Trans Am - LT1/T6
    Notice a trend??
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  19. #19 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    Moderator dsmuts's Avatar
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    It doesn't fit with the ls4 starter on there
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  20. #20 Re: 2006 GXP Trans into 2004 Comp G: Possible? 
    GXP Level Member Turbocharged400sbc's Avatar
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    I just finished swapping in the 97 trans/engine (I yanked from my rusted out 97 5TP) into my new 04 compG during its demod (and cause the trans lost 3rd).

    I used a jumper harness I made using the 97 trans/range switch harness wired to the "inline" 4t80e trans plug (trans side is on a pigtail outside the trans case on the 80e- makes the perfect trans side connector that plugs straight into the OE 4t65e trans connector)

    sometimes I thank the heavens that GM is so well at using common parts bin stuff....

    works great, I haven't programmed the PCM with a std non-TAPshift GTP file but it drove fine in D. I haven't tried to use tapshift with it, im still trying to make it my new DD General Purpose crap hauler (since my DD is always full of car parts/project parts) to replace my current 04 GTP clone

    its almost sad that such a well optioned black/black CompG is gonna be treated like a beater....hell I was gonna **** around and put the gen3 blower on with a tb adaptor just to take it in for the recall and see if the techs noticed....

    eventually ill fix 3rd (pretty sure its the sprag since I can get into 3rd on a 4-3 tapshift for a moment.) and swap the trans back in.

    but for now the cG' original L32/XP engine is sitting next to its mate prepped and ready for the 442's new chassis.

    while yanking the zzp headers and dropping in the PEM's equipped 97 motor I did notice that it looks like it would clear the LS4 trans case starter boss- sans ls4 starter.
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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