1988 Ford Bronco Malfunction - Drive Train & Driveline

Question: The truck had a speedometer gear(s) replaced at a transmission shop after the speedometer stopped working altogether. They had a lot of difficulty ordering the gears and when it was done the best they managed was a working speedo that reads very high. Ie. 75 at 50MPH. The truck runs poorly with bad data being fed into the computer. Is there a way to determine what the original gears/parts should be by VIN and order them? What we started with was not original either. Thanks!

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Technican: I recommend calling your Ford dealer. The parts must come from there, and are usually differentiated by the color of the gear. Your gears are not original, so they have the best ability to run the VIN and get the right parts. They may also need the calibration code from the drivers door area. Make sure you find a helpful parts man, be patient and persist until you get an answer.

Owner: How hard are these to replace? I picked up a Haynes manual on the way home this evening and I don't see anything I couldn't handle in briefly reading about the gear. What does the calibration code look like? The truck is 800 miles away and I'll have to describe it before my next trip so I can order parts. Thanks again!

Technican: As I recall, the calibration code is on the drivers door, or door post. It says clearly, CIBRATION CODE 5YC3, or some other code. Ask your dealer what information they need. They should be able to tell you what they need, and where to find it. The gear is easy to change, assuming only the external gear needs replacement. Remove 1 bolt, pull out the assembly, remove a clip to seperate the gear, then do it all in reverse.

Owner: One last question.. Is the inside gear a difficult thing to replace if the wrong outer gear has damaged it. I'm hoping not to have this problem but what if..

Technican: That is definitely a bigger project. If your gear is turning and not slipping, the inner gear should be OK. Likely the whole transmission would need to be disassembled to access the rear shaft.

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