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I'm still at a loss, watched the drive shaft while my son put the truck in drive and reverse. Seems like there is no play in the u-joints or carrier. Could it be in the trans?
It clunks, but that is because it is taking up the slack when I take off.
I'm pretty sure I would know if it wasn't in first gear from the performance angle.
I can't even tell you how many U-joints I have replaced in my F250's. None have ever given me a clunk noise when bad. The only hint of a problem was a bad vibration at highway speeds. The last u-joint I replaced was in my 94 250 and it had shattered the cups and was almost ready to come out. Most likely my fault always power shifting and driving like I stole it.
I'm still at a loss, watched the drive shaft while my son put the truck in drive and reverse. Seems like there is no play in the u-joints or carrier. Could it be in the trans?
mrsteve,
Couple of questions.
when your son put it in drive and reverse, did the drive line start turning right away or did the engine seem to rev up and then catch up to the drive line?
If the engine reved up first, then yes it could be the trans. If you have the auto trans you may have something going on internal. First thoughts would be tork converter or dirty/low fluid or cloged filter.
If you have a manual, the springs on the clutch plate over time become totally compressed and can cause the clutch to clunk when engaging. I have expierences this one with some older vehicles.
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