Occasional shifting clunk

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Jul 30, 2003
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Anyone know what would cause a clunk occasionally during shifting? It's a stock 78 40. Does not always happen. Seems like the slower I move the shift lever, the less clunk there is. Sometimes it does not do it at all. The clunk also varies in loudness/intensity. The worst it was was one time going from 1st to reverse, really loud clunk and felt it in the floor. I noticed a very slight sort of whirring noise when I am in neutral with my foot all the way off of clutch. It shifts pretty smoothly although and doesn't grind or make really frightening sounds. I grabbed the front drive shaft and there was slight play when I spin it back and forth, but not much, might be normal. The uni-joints are tight and look good. Any ideas what to check?

Thanks a lot for reading and for any suggestions.
 
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Gear oil, output shaft bearing, output shaft stake nut, RR U joints, Motor mounts, tranny mounts Whirring noise is a bad sign that the clutch is riding on the TO bearing.
 
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Jul 30, 2003
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Last night I adjusted the release cylinder pushrod so that it was closer to the release fork. This made the shifting a lot better in general and has pretty much eliminated the symptoms, so far. Today I'll check the gear oil and if it's low, I'll replace it since I don't know what brand is in there now. Does anyone have favorite type/brand? I'm in the N.E. and get some very cold temps.

Thanks a lot for your time and suggestions

Jim
 

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