91 Probe Trans flares on 2 to 3 shift - Ford Forum - Enthusiast Forums for Ford Owners

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91 Probe Trans flares on 2 to 3 shift

  #1  
Old 02-25-2019, 11:21 PM
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Default 91 Probe Trans flares on 2 to 3 shift

Wife's 91 Probe was shifting fine and not slipping with 138k, but then the front seal started leaking faster than you could pour in fluid. Hauled it to a local transmission shop. It was 1k to R&R for seal or 2.3k for complete walk trough. Elected to rebuild due to 28 years and 138k miles - figured fresh fluid would wash the trash out and we would end up rebuilding anyway. They did rebuild and a valve body mod which was supposed to be required. On the way home from the shop the tranny would flare at the 2 to 3 shift. My wife states the engine would rev up and she lets off, then the trans is in 3rd. I drove it a couple times and had same result. Returned to shop they did more valve body work etc... But there is still a flare at 2 to 3 shift. I think it is a bad sprag. Has anyone else experienced this issue after a rebuild with valve body mod - if so what was your issue?
 
  #2  
Old 02-28-2019, 01:49 PM
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There are what we call accumulators in an auto trans that cushion upshifts. It sounds like either one of the clutch seals may not be sealing correctly or a possible problem with the 2-3 accumulator system. They might have missed something in the valve body also.
 
  #3  
Old 02-28-2019, 10:05 PM
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Originally Posted by hanky View Post
There are what we call accumulators in an auto trans that cushion upshifts. It sounds like either one of the clutch seals may not be sealing correctly or a possible problem with the 2-3 accumulator system. They might have missed something in the valve body also.
Thank You for the information. The flare during the shift gives me concern about it causing excessive wear in a clutch pack - is that a valid concern? BTW I have been told this is a this is a 2_ Pan ECAT transmission (hope I got that right).
 
  #4  
Old 03-01-2019, 07:08 AM
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I believe you have a valid concern, here is why.
Usually when a clutch is applied there is minimal slippage because slippage produces heat and heat is a transmissions worst enemy.
When the engine flares and the vehicle is not directly responding that means the clutch pack is generating excess heat and damage can result to the fiber discs in the clutch pack. This problem should be corrected before the particles and heat get circulated throughout the trans and cause addl problems.
 
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