Thread: trans swap

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  1. #1 trans swap 
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    i was thinking about swapping the trans in my 97 gtp, i have a 98 se with a blown head gasket and was told the non supercharged trans has better gearing. is it worth the work or should i just keep the trans i have in my gtp. (both trans are in great shape) also if i did swap them would i lose the hud?
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  2. #2 Re: trans swap 
    SE Level Member McCoyH's Avatar
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    Regulat (gtp) trannys don't work in the GTPs (HD trans) if I remember right
    Indianola Tint and Detail
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  3. #3 Re: trans swap 
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    ok, thanks.
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  4. #4 Re: trans swap 
    GTP Level Member Rico's Avatar
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    If you swap them it would be wise to also swap the differential. The L36 diff won't hold up to the L67's power.
    Your gearing will be different so this should be programmed into the PCM.

    Edited: Also check to make sure the 97 has the 4T65E-HD transmission. It may be the 4T65E same as the 98 SE.
    Last edited by Rico; 04-20-2012 at 11:31 AM.
    It's a CUMMINS Dodge not a Dodge Cummins
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  5. #5  
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    Hopefully dave from t e p steps in here.

    IIRC, Your 1997 gtp is a vacuum controlled transmission.

    Also, the 98 se may have a 3.1L

    Sent from my DROID RAZR using Tapatalk 2
    For all your 3800 needs:
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  6. #6 Re: trans swap 
    GTP Level Member Rico's Avatar
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    I know the 97 NA had the 4T60E but what about the 97 GTP?
    It's a CUMMINS Dodge not a Dodge Cummins
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  7. #7 Re: trans swap 
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    Quote Originally Posted by copgtp View Post
    Hopefully dave from t e p steps in here.

    IIRC, Your 1997 gtp is a vacuum controlled transmission.

    Also, the 98 se may have a 3.1L

    Sent from my DROID RAZR using Tapatalk 2
    no, gtps did not use that.
    98-XP e85 SSAC HPT AGX Bullets Every BRM piece home built trans
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    94z28 with a cam that chops so hard it hurts def peopels ears.
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  8. #8 Re: trans swap 
    Turbo is the way to go. BillBoost37's Avatar
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    Want to save the SE? I'll personally PP you $20 if it's a headgasket. Meanwhile..please read this thread
    http://www.grandprixforums.net/97-03...ure-60667.html

    99% of Na issues that are diagnosed as a head gasket etc, are a bad upper and/or LIM gaskets.
    I drink..so consider that when reading my posts.

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  9. #9 Re: trans swap 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by gmpowered View Post
    no, gtps did not use that.
    So the 97 GTP used the 4T65E-HD or the 4T65E?
    Bill? Anyone?
    It's a CUMMINS Dodge not a Dodge Cummins
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  10. #10 Re: trans swap 
    Turbo is the way to go. BillBoost37's Avatar
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    4T65E HD in 97

    96 Bonneville SSEi, Park Ave Ultra and SC'd Riviera had the 4t60E
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  11. #11  
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    Quote Originally Posted by McCoyH View Post
    Regulat (gtp) trannys don't work in the GTPs (HD trans) if I remember right
    Yes they will.
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    Quote Originally Posted by Rico View Post
    If you swap them it would be wise to also swap the differential. The L36 diff won't hold up to the L67's power.
    Yes they will.

    But since you already have it you might as well use it.
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  13. #13 Re: trans swap 
    Turbo is the way to go. BillBoost37's Avatar
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    In 4T60's you can't just swap diffs between different years etc. GM was hunting around etc and changed the pitch etc on the pinion often. If you put the wrong pitch diff into a trans..it'll blow the planetaries off in record time.
    I drink..so consider that when reading my posts.

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  14. #14 Re: trans swap 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    In 4T60's you can't just swap diffs between different years etc. GM was hunting around etc and changed the pitch etc on the pinion often. If you put the wrong pitch diff into a trans..it'll blow the planetaries off in record time.
    I thought all 4T65E's were diff swappable. If not then I'm confused.
    It's a CUMMINS Dodge not a Dodge Cummins
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  15. #15 Re: trans swap 
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    1) the se has the 3800
    2) the gtp has the hud and sport shift so what ever trans that is.
    3) its definitely a blown head gasket, coolant is coming out the exhaust, looks like im driving the batmobile with the smoke screen on.
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  16. #16 Re: trans swap 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by STW View Post
    1) the se has the 3800
    2) the gtp has the hud and sport shift so what ever trans that is.
    3) its definitely a blown head gasket, coolant is coming out the exhaust, looks like im driving the batmobile with the smoke screen on.
    Did you read the link Bill posted?...and rule out the UIM? The symptoms are exactly the same. If it were a head gasket (almost unheard of on the 3800) it probably would have hydrolocked by now.
    It's a CUMMINS Dodge not a Dodge Cummins
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  17. #17 Re: trans swap 
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    And it'll hydrolock from a UIM/LIM as well.
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  18. #18 Re: trans swap 
    GTP Level Member Rico's Avatar
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    Quote Originally Posted by matt5112 View Post
    And it'll hydrolock from a UIM/LIM as well.
    Severe cases, yup.
    It's a CUMMINS Dodge not a Dodge Cummins
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  19. #19 Re: trans swap 
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    well i know its the head gasket, because i cooked it playing on the highway, i was racing a friend blew a hole in my rad, it ran dry car overheated and cooked the engine. plus i got mad and burnt the hell out of it. lol
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  20. #20 Re: trans swap 
    GTX Level Member GTPSHAWTY's Avatar
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    sir i ran my car hot 20 times in a night. from a cracked radiator... it took me 3. hours for a 30 minute ride... no exaggeration ... no coolent.. baked the lower intake manifold... i sworn the hg was blown... did a compression test and all were good... changed the lim. gaskets. good to go.. soo dont be so sold on a hg after it ran hot...
    CTRACER: YOU SHUT YOUR MOUTH WHEN YOUR TALKING TO ME
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