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560 gear noise

K

Karl in MD

Member
I checked the archives and didn't find anything, so here goes: My 560 Gas has a click in all gears except 5th (which I know is direct drive). The click gets faster as you go to higher gears. It doesn't seem as bad if you are under load, but you can always hear it. I'm figuring it isn't in the final drives, diff or axles, since 5th gear is quiet regardless of speed or load. Any help would be greatly appreciated.
 
Something is not making too much sense here. The transmission input shaft, counter shaft, and reverse idler all turn in direct ratio to engine speed, not road speed. The transmission main (output) shaft, differential assemble, and final drive components all rotate at speeds directly related to road speed.

Normally when you have a complaint where there is noise in all gears except 5th the problem is in the constant mesh gears or lower shaft bearings. A bad pilot bearing noise would slow down as you moved to a faster gear.

About the only thing that I can think of that would match your problems is a noisy rear main shaft bearing where the race is bad on top. When in gears 1 - 4 there is a force pushing the main shaft up as the gears try to separate. When in 5th the force would only be to the side from the ring and pinion gears. What kind of noise do you have in reverse?
 
It clicks in reverse also. I thought a gear tooth or teeth broken, but like you said, it would not change speed like it does. I've worked on transmissions for years and I'm lost. I'd like to have an idea of what I'm facing when I do tear it down. Thanks!
 
Take the cover off hydralic filter and see what is in there. If nothing is found in there pull pto out and fish arround in rear end with a magnet and maybe you will find some clues and go from there. Good luck
 
Sure it isn't the axle clamps on the wheel hubs? They might be pulling enough in 5th that they aren't making noise. Axle bearing maybe. I'd jack a rear wheel up & roll the wheel to listen for noise. Try to locate before you tear into the tranny.
 
Already checked the wheels, rims, axles, etc. The noise changes frequency through the gears. Loudest in 4th direct coasting, no noise in 5th, either pulling or coasting.
 
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