1994 Ford Thunderbird xmission drops OD and 3rd at speed

Tiny
WHAMMAKER
  • MEMBER
  • 1994 FORD THUNDERBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 103,000 MILES
Looking for guidance on xmission problem in 94 Tbird LX with 103,300 miles.
Problem: Began in Oct. 2009 with 96,400 miles. At speed (anywhere between 50 mph and 75 mph) either with cruise on or off, xmission will suddenly drop OD & 3rd. Using throttle to vary engine rpm has no effect on picking up xmission drive. No check engine light appears. O/D light does not flash. After coasting down to about 45 mph (or coming to a stop) and then re-accelerating to speed xmission performs as normal. This repeats 2, 3, or 4 times in a stretch of 5 or 6 miles. No advance warnings, it just does what it wants.

Action taken: I was on vacation so drove to a local Ford dealer who did an inspection, changed filter, and fluid and sent me on my way. They said everything in xmission was very clean and appeared to be in good shape. I got about 50 miles before re-occurance so I returned. They weren't real happy to see me. This time they replaced the T/R sensor with F5AZ-7A247-AA and sent me on my way.
All was well until this past weekend and it was deja-vu all over again. After about three dis-engagements in several miles I drove home 275 miles with no re-occurance.

Local Ford dealer says one of the clutch packs is beginning to fail and a complete rebuild is in order?

Thanks
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Tuesday, June 22nd, 2010 AT 12:24 PM

3 Replies

Tiny
JACK42
  • MEMBER
Take it to a reputable trans shop for a second opinion. Usually when a clutch pack is going it wont come and go like that. This sounds like it may be an electronics or solenoid issue.A trans shop will have the software to force actions on the solenoids to see how they react and if they are working properly
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Tuesday, June 29th, 2010 AT 8:10 AM
Tiny
WHAMMAKER
  • MEMBER
2CarPros Jack,
Thanks for your thoughts, but since the shifting seems flawless the overwhelming majority of the time I question whether or not any software package will detect a fault? It smells to me to be electronic related (either go/no-go) and lets face it with so much 16 rear old electronic stuff involved, who knows. What do you think about the OSS (Ford pn F4AZ-7H103A) as being the problem. I drove another 860 miles trhis past weekend with no problem, but this is like a car version of Russian roulette it seems to me.
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Tuesday, June 29th, 2010 AT 9:05 AM
Tiny
JACK42
  • MEMBER
It could be, I was just thinking if they used a scan tool "break out box" maybe they could get it to fail without having to drive it who knows how many miles.
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Tuesday, June 29th, 2010 AT 9:53 PM

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