Thread: won't stay in 4th?

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  1. #1 won't stay in 4th? 
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    I did a search and im not sure which fault it falls under. I hear/feel the tranny shift into 4th and then i hear it jump rpms at a like 45-50mph on me. I have downshifted into 3rd before to see virtually no difference.

    I had a local tranny guy drive the car and he said that forth was gone and that he thought some sort of spider gear replacement would probably do the trick. But what im reading on here is that it might be a valvebody issue?

    I planned to take the tranny out up on the lift and take it in to him to tear into and fix. The one code i got was something to do with torque converter clutch or something. Its been awhile and i didn't pay much attention.

    Should i still take it into him or is this a bad idea? He has rebuilt tons of transmissions, but im not sure if while he tears it apart if he will see the problem or not. He told me he it would be around 4-500 bucks after parts and labor for him to do it. (he works on the side)
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  2. #2 Re: won't stay in 4th? 
    GrandPrix Junkie Sabrewings's Avatar
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    Sounds like the 4th clutch hub shaft splines are stripped. What year car? If it's before an 03 that is likely the cause because in 03 GM started using hardened shafts that don't strip.
    2004 Impala LS - got some mods sold!!!
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  3. #3 Re: won't stay in 4th? 
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    Its a 98 gt. If thats the case is it a pretty easy fix for a tranny guy, especially if i bring it to him?
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  4. #4 Re: won't stay in 4th? 
    GrandPrix Junkie Sabrewings's Avatar
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    Driver's side of the cradle has to be dropped and the side cover of the tranny has to be removed. I'm not sure how deep he has to go after that. A tranny shop shouldn't find it too difficult.
    2004 Impala LS - got some mods sold!!!
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  5. #5 Re: won't stay in 4th? 
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    remove valve body and channel plate, remove fourth clutches, slide out the 4th clutch shaft, simple.

    Logan
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  6. #6 Re: won't stay in 4th? 
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    ok so how expencive are these parts im probably looking at?
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  7. #7 Re: won't stay in 4th? 
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    like $60 for the clutch hub, $10 for the valve body and channel plate gaskets. Youll have to go to a tranny shop to get the gaskets b/c i dont think anyone sells them seperately.

    Logan
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  8. #8 Re: won't stay in 4th? 
    Transmission Expert Trannyman95's Avatar
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    I have all of the parts on hand if you dont have any luck at a local trans shop.
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  9. #9 Re: won't stay in 4th? 
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    damn thats a cheap fix but seems lke a pain in the ass ill just take it easy on my car until i get my auto trans class in school lol that way i can leave her on a lift ha
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