Car revs high before changing gears

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Thread: Car revs high before changing gears

  1. #1
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    Car revs high before changing gears

    I just got my car back today, it sat for six month. It is an 87T auto, I replaced the engine with a JDM 89+ 7mgte low mileage. Before the engine change the car changed gears fine, but now with the new engine it revs high before it changes gears. Is this an ECU problem, tranny problem (I'll check the tranny fluid when the car cools off). When I drive it sounds and feels like the car is in low gear. Can anyone give me some helpful information?
    Thanks.

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  3. #2
    sorcereur
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    You check tranny fluid while the car is Hot, not cool.
    And, what happens when you lay off the gas while it's shifting? Not that you're supposed to, but does it still rev up?

  4. #3
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    Originally posted by sorcereur
    You check tranny fluid while the car is Hot, not cool.
    And, what happens when you lay off the gas while it's shifting? Not that you're supposed to, but does it still rev up?
    In Las Vegas even letting the car sit for a little while it's still hot. The car doesn't rev high when I lay off the gas. The rpm seems normal when I'm not stepping on the gas.

  5. #4
    SupraForums Member Kroze's Avatar
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    your tranny is dyiing!!

  6. #5
    Brian@7MPower
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    Sounds like slizzipage.

  7. #6
    bigdough666
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    Yes sir, sounds like what my tranny was doin when it was on its last leg. I had a tranny guy tell me that the seals inside the tranny were old and worn down. When the tranny was cold it would shift like shit, but when it heated up it was better, but still shitty. The estimate was like $1200 to fix it, so I paid $450 and got a full R-154 5-speed swap.

  8. #7
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    I checked the tranny fluid while it was hot and while it was cold the next day it is way past the full mark. I think they accidently over filled it. The mechanic said there may have been tranny fluid that thickened and didn't drain, and once the car got hot it added to the new fluid. The car sat for six months.

  9. #8
    27836-12121 ARTSUPRA's Avatar
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    do 5spd swap ,don't bother with auto.

    Give the auto tranny to you grandpa he'll put it into a good use

  10. #9
    Republican Ckanderson's Avatar
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    the car has to be running to check tranny fluid...

  11. #10
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    I know that the car has to warm up and be in neutral when you check the tranny fluid. I have the owners manual and a repair manual, but there are also marks for checking a cold transmission it's in the owners manual. The fluid is way past full with a hot running engine and cold engine.

  12. #11
    Republican Ckanderson's Avatar
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    oh... heh, nm ill shut up!

  13. #12
    Some Guy With A Supra BoostMan03's Avatar
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    Can having too much tranny fluid present problems??

  14. #13
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    Originally posted by BoostMan03
    Can having too much tranny fluid present problems??
    According to the repair manual too much fluid can cause, slippage, overheating, and damage tranny seals.

  15. #14
    SupraForums Member crafty's Avatar
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    An over filled tranny will cause the fluid to start foaming. You can't pump foam well, so your pressure drops. Not enough pressure to keep the clutches applied and you will get slipage which will create heat which is the biggest killer of the tranny.

    Pull the drain plug and take out a quart and recheck it. Hopefully it not to late.

    HTH Dennis

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