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Transmission slips bad at WOT

This is a discussion on Transmission slips bad at WOT within the 1997 to current 4 speed Automatic (4T65E) (4T65E-HD) forums, part of the Transmissions category; last night on the on ramp to the highway going about 30mph, i punch it, and it downshifts to first ...

  1. 11-12-2009 #1
    Rather B Blown
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    Question Transmission slips bad at WOT

    last night on the on ramp to the highway going about 30mph, i punch it, and it downshifts to first like normal, but as its pulling it really slips bad. its like it would grab, and slip out again like 4-5 times, i dont really know how to explain it. you could really feel it surge and buck. it only happens at WOT. Oh also, when you're going about 50-55mph and as it shifts into 4th it kinda slips and revs the motor before it shifts, but its always done that. the WOT thing just started last night.
    Quote Originally Posted by Reptile
    It sounds like you accidentally stuffed a midget in the downpipe, and he's hammering out an SOS to get out.
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  2. 11-12-2009 #2
    Toofastgs
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    Default Re: Transmission slips bad at WOT

    Check tranny fluid. If it is fine time for a rebuild
    00' GTP 350/420 - Retired
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  3. 11-12-2009 #3
    Zef_66
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    Default Re: Transmission slips bad at WOT

    Quote Originally Posted by Toofastgs View Post
    Check tranny fluid. If it is fine time for a rebuild

    My bet is the latter.
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  4. 11-12-2009 #4
    Rather B Blown
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    Default Re: Transmission slips bad at WOT

    fluid level was about half a quart low and it smelled kinda burnt not horribly but noticeable, i topped it up and its still doing the same thing. on another note could i use a tranny out of a gt to get the 3.29s? or should i just get a junkyard gtp tranny and put it in for now and build my broken trans with good parts and 3.29s.
    Quote Originally Posted by Reptile
    It sounds like you accidentally stuffed a midget in the downpipe, and he's hammering out an SOS to get out.
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  5. 11-12-2009 #5
    ninnyGTP
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    Default Re: Transmission slips bad at WOT

    Burnt clutches or burnt fluid most likely
    98 Grand Prix GTP L32, GenV, n*, 3.2", 1.9 rr's, 3.29 gears. All that jazz SOLD
    99 Mustang GT Steeda UDPs, 3.73s, Pypes O/R xpipe, Accufab plenum, Steeda CAI, B&M ripper, MHS s2 cams, 10.5:1 compression (290whp/310wtq) SOLD
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  6. 11-13-2009 #6
    Boostd1
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    Default Re: Transmission slips bad at WOT

    That tranny is done. Burnt fluid in a GM Automatic = Toast

    Dave @ TripleEdgePerformance.com

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  7. 11-13-2009 #7
    ninnyGTP
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    Default Re: Transmission slips bad at WOT

    ^ Dave is the MAN!
    98 Grand Prix GTP L32, GenV, n*, 3.2", 1.9 rr's, 3.29 gears. All that jazz SOLD
    99 Mustang GT Steeda UDPs, 3.73s, Pypes O/R xpipe, Accufab plenum, Steeda CAI, B&M ripper, MHS s2 cams, 10.5:1 compression (290whp/310wtq) SOLD
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  8. 11-13-2009 #8
    03impala9c1
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    Default Re: Transmission slips bad at WOT

    sounds to me that that trans has about had it at this point. sounds like it could have started as torque converter/lockup issues and escalated from there. regardless... find yourself a gt trans, swap your hd dif and dif cover onto it put in the gt torque converter and mate it to a drilled l67 flexplate. you will thank yourself
    96 z/28 headers, cam, 3.73's, n2o, etc. - cant wait to bring her outta storage.
    99 gtp 3.0 nic l32 built trans and susp. sold
    99 regal gse t66 t3t04e zzp trans l32 stattama custom cam HUGE spearco a2a ic sold
    98 gtp 3.4 built susp sold
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  9. 11-13-2009 #9
    ninnyGTP
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    Default Re: Transmission slips bad at WOT

    Quote Originally Posted by 03impala9c1 View Post
    regardless... find yourself a gt trans, swap your hd dif and dif cover onto it put in the gt torque converter and mate it to a drilled l67 flexplate. you will thank yourself
    Oh yes... Yes you will
    Nothing like having a completely useless 1st gear at WOT haha. Wouldn't have it any other way
    98 Grand Prix GTP L32, GenV, n*, 3.2", 1.9 rr's, 3.29 gears. All that jazz SOLD
    99 Mustang GT Steeda UDPs, 3.73s, Pypes O/R xpipe, Accufab plenum, Steeda CAI, B&M ripper, MHS s2 cams, 10.5:1 compression (290whp/310wtq) SOLD
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  10. 11-13-2009 #10
    03impala9c1
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    Default Re: Transmission slips bad at WOT

    Quote Originally Posted by ninnyGTP View Post
    Nothing like having a completely useless 1st gear at WOT haha
    It gets the chicks so lol
    96 z/28 headers, cam, 3.73's, n2o, etc. - cant wait to bring her outta storage.
    99 gtp 3.0 nic l32 built trans and susp. sold
    99 regal gse t66 t3t04e zzp trans l32 stattama custom cam HUGE spearco a2a ic sold
    98 gtp 3.4 built susp sold
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  11. 11-13-2009 #11
    ninnyGTP
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    Default Re: Transmission slips bad at WOT

    Quote Originally Posted by 03impala9c1 View Post
    It gets the chicks so lol
    Hey it's not called a GTP for nothing. "Gets The P*ssy"
    98 Grand Prix GTP L32, GenV, n*, 3.2", 1.9 rr's, 3.29 gears. All that jazz SOLD
    99 Mustang GT Steeda UDPs, 3.73s, Pypes O/R xpipe, Accufab plenum, Steeda CAI, B&M ripper, MHS s2 cams, 10.5:1 compression (290whp/310wtq) SOLD
    01 SVT Cobra #3654, B&M Ripper, K&N FIPK2, MAC O/R xpipe
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