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It is usually the slip yoke as others have eluded to.
There has been several discussions on this site pertaining to it.
The grease from Ford is very close to 100.00 for the repair, I don't see why one could not use CV joint grease in its place. Maybe someone can give some imput on the grease they used.
Most of the symptions is a clunk when you start and stop. The clunking over a period of time could also add to a U-joint problem.
I know a guy who had the same problem with his F-350 and lubing the slip yoke solved the problem. It almost acts like a slip in the transmission sometimes.
Exactly! I thought the tranny was going bad. Just bought a '99 F250 and this is what it's doing. I'll be lubing the splines tomorrow. Thanks.
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