1994 Ford Bronco Mr transmissions keep going bad

Tiny
ZIESMER
  • MEMBER
  • 1994 FORD BRONCO
Transmission problem
1994 Ford Bronco V8 Four Wheel Drive Automatic

I have a very nice '94 Bronco with a 351 engine in that keeps blowing out transmissions. Several years ago while in Santa Fe NM my tranny went bad and I had it towed into the local Ford dealer for replacement. They put in a Ford reconditioned tranny and it went out on the test drive. So they put another one in and I didn't make but a few miles and it went out again. They said that because I had a Super Chip installed in it that is the reason that the transmissions had gone bad and if I wanted my Bronco fixed I needed to pay for another and remove the Chip. Being 600 miles from home I had no choice so about $7000.00 later I drove away. That tranny lasted about 1,500 miles. I replaced that one with one that I got from a junk yard and it lasted about 200 miles. All of the symptoms that I have experienced with all of the transmissions are about the same. Driving down the road I start to hear wirring and loud sounds. When I stop I can not get the vehicle to go into reverse and barely forward. If I let it set and cool off I can coax it in reverse or forward but you can tell that it is about ready to totally lock up. This is getting very expensive. I did send the Super Chip to the factory and had it tested and they said that it was up to the factory specs and that it would not cause a transmission to go out. I called Ford and complained about the dealer screwing me out of two transmissions and they said that they stand behind their dealer 100% go figure! Do you have any ideas?
Friday, April 17th, 2009 AT 3:07 PM

2 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
First, what transmission do you have? The most common cause for the problem you describe is plugged transmission cooler lines going to the radiator. If this is the case, the fluid pressure goes into "bypass" and stays there which overheats the fluid and "toasts" tranny.
Your performance chip had/has nothing to do with the trans failure unless you take it out and grossly abuse it, which I doubt. Let me know what you find.
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Friday, April 17th, 2009 AT 9:18 PM
Tiny
ATKAPARKING
  • MEMBER
  • 64 POSTS
Yes, an often overlooked aspect of trans overhaul is all the junk in the lines and in the transmission cooler. I would blow out the lines as well as replacing the trans cooler (I think this one is in the radiator, so that means radiator replacement).
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Thursday, April 30th, 2009 AT 11:32 AM

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