Hard shifting

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Jun 11, 2003 | 04:38 AM

Goneraw

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Hard shifting

I recently drove my 95 Bronco XL ( 5.0 EFI) to a place in the moutains. On my return, just before I reached my home, I noticed that the tranny had begun to shift very early and rather violently. I have a 4 speed overdrive automatic, and have had no previous problems. I ran the truck through each one of the gears maually with no difference. I also noticed a slight whine in first gear and what sounded like fluid spraying from under the vehicle, (although I could see no instaces of any leaks). The fluid level is good and hasn't dropped since I started checking it, and the fluid has good color with no burned smell.
Has anyone experienced a problem like this, and did you find a quick solution?

Thank You.

Jun 11, 2003 | 09:26 AM

adelyser

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Hard shifting

Yep, had the same problem in my Bronco. It ended up being the PCM. There is a circuit that controls the fluid pressure in the tranny, and mine went out, so I had maximum pressure in the tranny, resulting in fast and very hard shifts. Pull the engine codes and check for the PCM malfunction code, as well the transmission pressure circuit code. It could also be a bad solenoid in the tranny.

Jun 12, 2003 | 11:54 AM

Goneraw

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Hard shifting

I took it to a local tranny shop, thinking the worst, ther ran a code read on it and came up with the throttle positioning sensor was out of range, The tranny had reported a slip (not constant) and at some point an overheat episode. They cleared the memory on the computer and it runs fine. I replaced the TPS ($34) and bought myself a code reader to check for the same probs. The tech said the computer cranks up the oil pressure in the tranny to prevent slipping from doing further internal damage, but it felt like it was going to break in half when it shifted. Hopfully, these were only a random problem caused by the TPS sending bad ifo to the computer.

Thanks