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1987 Chevrolet Truck trans shudder

Tiny
MFOX6425
  • MEMBER
  • 1987 CHEVROLET TRUCK
  • 135,000 MILES
GOOD MORNING

I AM RUNNING INTO PROBLEM WITH MY 700R4. THE PROBLEM IS WHEN I AM RUNNING DOWN THE ROAD IN OVERDRIVE I'M GETS A VIOLENT SHAKE IN MID THROTTLE. YOU GOT TO BE INTO THE THROTTLE OR APPLY LITTLE THROTTLE FOR IT TO NOT BE THERE. ALSO IT IS STARTING TO FEEL A LITTLE SLUGGISH. I WENT AS FAR A DISCONNECTING THE TCC LOCK-UP AT THE BRAKE PEDAL AND THE VIBRATION STOPPED AND I REGAINED SOME POWER BACK. ANY IDEAS WHAT IT MAY BE? TORQUE CONVERTER OR PUMP?

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Tuesday, October 8th, 2013 AT 7:44 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You can't even be sure it's a transmission issue at all. Many engine performance issues are mistaken for transmission issue and visa-verse. If it is the transmission I would tend to blame the torque converter.
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Tuesday, October 8th, 2013 AT 8:03 AM
Tiny
MFOX6425
  • MEMBER
  • 2 POSTS
THE THING THAT I DON'T UNDERSTAND IS THAT WHEN I DISCONNECT THE TCC LOCK-UP THE SHUDDER/VIBRATION IS NOT THERE IN ANY OF THE ACCERATOR POSITIONS. PLEASE ADVISE.
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Tuesday, October 8th, 2013 AT 8:24 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That doesn't prove much. You removed both the low RPM load and the converter so the issue could still be either.
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Tuesday, October 8th, 2013 AT 8:29 AM

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