Transmission Designation For '06 Grand Prix GXP

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Thread: Transmission Designation For '06 Grand Prix GXP

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    Transmission Designation For '06 Grand Prix GXP

    I recently purchased a 2006 Grand Prix GXP with 80,000 and in very good condition. I've been reading a lot about them and I keep seeing that their transmissions blow up around 60k+, so does anyone have any information on the transmission so I can look up the specs on it? Also, I've read that my front and rear wheels (aluminum Alcoa "18s) are different sizes, I know the front tires are wider, but are the actual wheels different sizes too?

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    Re: Transmission Designation For '06 Grand Prix GXP

    Honestly, best place to ask would be here: www.gmls4.com

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    Re: Transmission Designation For '06 Grand Prix GXP

    Sean, that's a generalization about the transmissions. I guess some did, especially those that spent time at the dragstrip. Plenty are still going strong at over 100k on the original tranny.

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    Re: Transmission Designation For '06 Grand Prix GXP

    Plenty have been replaced too, LS4's are notorious for devouring their transmissions...strip or street used.

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    Re: Transmission Designation For '06 Grand Prix GXP

    Quote Originally Posted by All Star View Post
    Plenty have been replaced too, LS4's are notorious for devouring their transmissions...strip or street used.
    So what would my best bet be to prevent that from happening? I've been looking into a trans oil cooler, but I'm not sure how much that will actually do for me.

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    Re: Transmission Designation For '06 Grand Prix GXP

    Try http://ls1tech.com/forums/ls4-performance-108/ .

    The front Alcoas are 8" wide, the rears are 7". I have a pair of rears if you need some. Later 2007s and 2008 etc. went to a cheaper non-Alcoa wheel.

    I'd like to see the stats on blown trannies. To hear some folks, especially those with the V8 W bodies, ALL trannies blow. I doubt that's true.

    Maybe someone here with GM warranty connections or perhaps at a trannie shop could shed some light on the rumormill.

    Good luck with your car.
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    Re: Transmission Designation For '06 Grand Prix GXP

    i had a 2005 GTP Comp G with the same transmission,by 71k miles it was toast,i had it rebuilt havent had a problem yet,from what i heard and read on forums these transmissions always had problems
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    Re: Transmission Designation For '06 Grand Prix GXP

    Quote Originally Posted by Neanderthal View Post
    Try http://ls1tech.com/forums/ls4-performance-108/ .

    The front Alcoas are 8" wide, the rears are 7". I have a pair of rears if you need some. Later 2007s and 2008 etc. went to a cheaper non-Alcoa wheel.

    I'd like to see the stats on blown trannies. To hear some folks, especially those with the V8 W bodies, ALL trannies blow. I doubt that's true.

    Maybe someone here with GM warranty connections or perhaps at a trannie shop could shed some light on the rumormill.

    Good luck with your car.
    I'm interested in those wheels, I'd like to have the same size wheels and tires all the way around, because with a FWD car, I'd like to rotate my tires religiously. Send me a PM with details, please.

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    Re: Transmission Designation For '06 Grand Prix GXP

    The 440T4 was first used with 2.8L V6's.

    Later changed to being called the 4T60, later with electronic controls added later. It served well in like 3100 applications, pretty decent in L27 3800 applications, and alright in L36 3800 applications (non performance vehicles, like LeSabre's etc). It became marginal if put into something a bit more sporty like SSE Bonnevilles.

    Became the 4T65 and was stuck with L67 3800's, where it was just a bad idea.

    Then they bolted it up to a V8, which became a drivetrain that shouldn't have been sold in the first place.
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    Re: Transmission Designation For '06 Grand Prix GXP

    Quote Originally Posted by F14CRAZY View Post
    The 440T4 was first used with 2.8L V6's.

    Later changed to being called the 4T60, later with electronic controls added later. It served well in like 3100 applications, pretty decent in L27 3800 applications, and alright in L36 3800 applications (non performance vehicles, like LeSabre's etc). It became marginal if put into something a bit more sporty like SSE Bonnevilles.

    Became the 4T65 and was stuck with L67 3800's, where it was just a bad idea.

    Then they bolted it up to a V8, which became a drivetrain that shouldn't have been sold in the first place.
    So what you're saying is my car is using a 4T65 transmission? Any suggestions as to what I should do for it, I.E. new tranny, rebuild current, etc.?

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    Re: Transmission Designation For '06 Grand Prix GXP

    Your car actually utilizes the 4T65 HD transmission, and yes there are random failures but there are also high mileage LS4/4T65HD vehicles as well.
    I want a car so violent that the mere thought of full throttle would cause a heart attack. That actually going wide open throttle in would result in nothing less than instant death!
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    Re: Transmission Designation For '06 Grand Prix GXP

    Quote Originally Posted by germeezy1 View Post
    Your car actually utilizes the 4T65 HD transmission, and yes there are random failures but there are also high mileage LS4/4T65HD vehicles as well.
    No it actually utilizes the 4T65E-HD model MN7 which has a 3.29:1 differential. There are 4 differentials used in this unit.

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    Re: Transmission Designation For '06 Grand Prix GXP

    Quote Originally Posted by SeanHanson22891 View Post
    So what you're saying is my car is using a 4T65 transmission? Any suggestions as to what I should do for it, I.E. new tranny, rebuild current, etc.?
    If it isn't yet broken...



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