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Jerks when shifting

Tiny
LYNNGRIM
  • MEMBER
  • 1988 FORD F-150
  • 75,000 MILES
My 1988 Ford F-150 clunks and jerks when shifting into and out of Overdrive (automatic transmission.) All other up shifts and downshifts are normal.

The problem seems to happen at all speeds.
Tuesday, July 10th, 2012 AT 1:12 AM

5 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
CHECK THE U JOINTS AND THE TRANS MOUNT
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Tuesday, July 10th, 2012 AT 2:38 AM
Tiny
LYNNGRIM
  • MEMBER
  • 2 POSTS
The ujoints don't clunk and the transmission doesn't jump when I change from Drive to Reverse, or Reverse to Drive.
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Wednesday, July 11th, 2012 AT 3:18 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Sorry I seam to have dropped your question. This seams to be a internal problem in the trans. Its more noticed when your at higher speeds. Youll need to take it to a trans shop and let a specialist drive it. Fyi you only test the motor mounts with the rev to drive test. Use a pry bar to check if the trans mount is broken and u joints can clunk if they get bad enough. Ty for using 2carpros
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Wednesday, August 8th, 2012 AT 1:10 AM
Tiny
LYNNGRIM
  • MEMBER
  • 2 POSTS
I have replaced the Throttle Position Sensor and the transmission now shifts 3-4 and 4-3 mormally.
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Wednesday, August 8th, 2012 AT 2:40 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Lynngrm thank you for letting us know what the fix for your problem was. We appreciate you letting us know.
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Friday, September 7th, 2012 AT 5:48 PM

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