Thread: 03 GTP Trans Issue

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  1. #1 03 GTP Trans Issue 
    GT Level Member jake91's Avatar
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    So i have a issue with the trans in my car. Taking off from a light sometimes the car takes off slow and then slams and bangs into first gear.

    At first I thought it was slipping but it doesn't free rev up real high and normally catches gear by 2,500 rpm. Its almost like I'm taking off in second and then it downshifts hard.

    After driving in the rain this morning it seems the conditions it happens in mostly is after wheel spin or hard driving. It will the do the clunk for the next 2-4 stops then start working find again.


    What does it sound like?
    Slipping?
    Line pressure?
    Clutch packs?

    What should i do?
    Pan drop and filter?
    Shift kit?
    Sell the car before it gets worse?

    For now I'm just babying it and it seem ok but who knows how long that will last

    2003 Pontiac Grand Prix GTP, thrasher intake, intense poly upper mounts, 06+ Impala dual piston calipers, 88k miles
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  2. #2 Re: 03 GTP Trans Issue 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    http://tripleedgeperformance.com/4T6...-Problems.html

    I would get it to do it again and scan the codes before you shut the car off. Many transmission codes will not set the SES light off yet still be present.

    SMGPFC Member #1
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  3. #3 Re: 03 GTP Trans Issue 
    GT Level Member jake91's Avatar
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    Ok i will do that next time it happens

    2003 Pontiac Grand Prix GTP, thrasher intake, intense poly upper mounts, 06+ Impala dual piston calipers, 88k miles
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  4. #4 Re: 03 GTP Trans Issue 
    GT Level Member jake91's Avatar
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    So i went out to scan it and ran it hard, but I never got it to do it again but I decided to check the trans fluid again and this time it looked aerated and bubbly. Talked to my dad and he thinks torque converter. That would make sense to me

    2003 Pontiac Grand Prix GTP, thrasher intake, intense poly upper mounts, 06+ Impala dual piston calipers, 88k miles
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  5. #5 Re: 03 GTP Trans Issue 
    GT Level Member jake91's Avatar
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    I think he may be right i was reading up on converters and the signs of failure.

    1. Less power at low speed- for the last few months ive felt my car has lost its go from a stop. first gear used to be worthless from a stop

    2. Of course the late engagement pulling away at a stop

    3. Ive been hearing a very very light whirring sound for the last week from the engine bay. I just thought it was the water pump going again

    2003 Pontiac Grand Prix GTP, thrasher intake, intense poly upper mounts, 06+ Impala dual piston calipers, 88k miles
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  6. #6 Re: 03 GTP Trans Issue 
    GTP Level Member buickman104's Avatar
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    I had those exact same symptoms along with the bubbly trans fluid. three weeks ago my forward band snapped! Was able to limp it home by manually shifting it to first then second gear with the transmission badly slipping.
    2000 Bronze Metallic GTP
    Power :Gen V, 3.6 pulley, 3 inch down pipe, Power log, FWI,and DHP Power Tuner,
    Handling: Vogtland Springs, GMPP sway bars, STBS, 18" Konig backbone, CTS-V Front brakes and GXP rear brakes
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  7. #7 Re: 03 GTP Trans Issue 
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    Sounds more like the input piston seal. As I believe its engaged in 1st gear. when you rev the engine the build up of pressure finally forces the piston to engage and bang into gear.
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