Thread: car will only shift into 3rd at 40mph

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  1. #1 car will only shift into 3rd at 40mph 
    SE Level Member e6600's Avatar
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    car will only shift into 3rd at 40mph, and when i let my foot off the gas
    it'll run all the way up to 3k rpm at 38mph in 2nd everytime

    its fine when im pegging it but when im commuting its ****in annoying
    i got no dtcs at all and ive got 120k on stock tranny

    thanks
    98 grand prix gtp: stock until i fix problems
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  2. #2 Re: car will only shift into 3rd at 40mph 
    resident snitch gtpinsc's Avatar
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    transmission DTC's will not set SES light... have u had car scanned at all?

    02 GTP with mods 05 GP for DD
    Quote Originally Posted by SuperSport View Post
    The majority of the people here are potheads who want to buy good condition parts at junkyard prices.
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  3. #3 Re: car will only shift into 3rd at 40mph 
    Donating Users kfish's Avatar
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    yes it will, i had a dtc for the torque converter lock up set my light off.
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  4. #4 Re: car will only shift into 3rd at 40mph 
    Donating Users Lawngoose's Avatar
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    I say your first step should be to d/c your battery for 15-30 minutes. Then hook it back up. This will reset your pcm. Then go drive and see if it does it again.
    02 GTP 13.6 @ 100mph - SOLD
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  5. #5 Re: car will only shift into 3rd at 40mph 
    resident snitch gtpinsc's Avatar
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    Quote Originally Posted by kfish View Post
    yes it will, i had a dtc for the torque converter lock up set my light off.
    ive had PCS, TCC, and a shift solenoid codes in PCM but never got a SES light.. u sure u didnt have a code for something else that set off light?

    02 GTP with mods 05 GP for DD
    Quote Originally Posted by SuperSport View Post
    The majority of the people here are potheads who want to buy good condition parts at junkyard prices.
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  6. #6 Re: car will only shift into 3rd at 40mph 
    Donating Users kfish's Avatar
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    no other codes.
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  7. #7 Re: car will only shift into 3rd at 40mph 
    SE Level Member e6600's Avatar
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    Quote Originally Posted by Lawngoose View Post
    I say your first step should be to d/c your battery for 15-30 minutes. Then hook it back up. This will reset your pcm. Then go drive and see if it does it again.
    ive done this a few times and its still the same
    and ill scan it while driving to see if anything happens

    it hard shifts but only when its hot, and theres a noticable pause between shifts in other gears too

    and its whining in 2nd gear only

    could it be a bad EPC solenoid?
    98 grand prix gtp: stock until i fix problems
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  8. #8 Re: car will only shift into 3rd at 40mph 
    SE Level Member e6600's Avatar
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    ok so
    no dtcs at all

    and the tranny is getting worse. when it gets hot, 4th gear wont work

    when the trannys hot theres this huge whining sound coming from the rear of the car

    could it be a problem with the cooling system? maybe the tranny line is clogged with dexcool
    98 grand prix gtp: stock until i fix problems
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  9. #9 Re: car will only shift into 3rd at 40mph 
    resident snitch gtpinsc's Avatar
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    start looking for a used trans or have that one rebuilt. its done.

    02 GTP with mods 05 GP for DD
    Quote Originally Posted by SuperSport View Post
    The majority of the people here are potheads who want to buy good condition parts at junkyard prices.
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  10. #10 Re: car will only shift into 3rd at 40mph 
    Ridin' the Blue IrishNation24's Avatar
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    do u have a overkill pcm?
    http://www.grandprixforums.net/membe...lbums-car.html
    2001 GTP special edition. lots of mods.
    1994 Greenwood C4 LT1-traded in for 6700 with 160K miles for....
    a 2004 LE MANS COMMEMORATIVE EDITION Z06 23K MILES.
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  11. #11 Re: car will only shift into 3rd at 40mph 
    SE Level Member e6600's Avatar
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    no stock pcm
    i drove it yesterday and it was almost fine except 3rd gear, and it was a cool 75f

    strange thing is i can use third gear but cant accelerate in 3rd gear, if i do it drops to 2nd
    98 grand prix gtp: stock until i fix problems
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  12. #12 Re: car will only shift into 3rd at 40mph 
    Donating Users Ibwrong's Avatar
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    As a couple of others have said, I'd look for a used trans with lower miles or get someone locally to quote a rebuild...
    2000 GTP - Project
    2000 Mustang GT
    2006 Charger
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