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Slow, rhythmic thrumming sound 50-60 mph
Posted 06 September 2016 - 06:12 AM
Posted 06 September 2016 - 10:39 AM
Posted 06 September 2016 - 12:09 PM
Posted 06 September 2016 - 02:51 PM
Posted 07 September 2016 - 06:34 PM
Just put a little testing into it. It's not the clutch, no amount of goofing around with it changes the sound.
Lug nuts are tight, wheel bearings feel good, nothing sounds right when I hit it with a mallet. I notice that I'm feeling it too, through the body but not stronger in the pedals, shifter, or wheel. I did notice when under the car that the left rear axle shaft slides very freely between the joints as I'd expect, but the right rear slides "gritty" and I can get it to stick in some angles of rotation. I assume those should be very free to float.
Does a failing axle make that sort of sound?
Posted 07 September 2016 - 07:50 PM
Posted 09 September 2016 - 06:58 AM
Posted 12 September 2016 - 07:25 PM
I think I overstated the clutch thing. It vibrates when I coast down through 55 mph with the clutch in.
Posted 11 January 2018 - 12:32 AM
Posted 11 January 2018 - 06:12 AM
Posted 11 January 2018 - 09:07 AM
A mechanic I work with suspects that there is a bearing that turns when in 2wd (separating the drive from the rear output) that does not need to turn on its own when 4wd is engaged. For those who have had the transmission apart does that make sense?
Posted 21 January 2018 - 09:26 PM
I've never had one apart, so I'm not much help in your situation.
We had a nice few days here so I took mine for a drive and did the same test. Still vibrates. Mine is completely engine speed related. Sitting still in neutral it really picks up above 3k rpm whether the clutch is engaged or not. I will add that right after I got the brat, it had trouble starting due to a worn ring gear, so I removed it and rotated it to where the un-worn teeth would do the engaging. It also had blown headgaskets and a worn thrust bearing, so it didn't get driven much before I had the bottom end rebuilt.
I have eliminated the water pump and alternator as a possibility by running it without the belt. The distributor shaft feels nice and tight still. The tranny mounts are new, and the engine mounts are presumably original but not oil soaked or broken.
I have a vibration analyzer so the next step for me is to spend some time playing with it.
Posted 06 February 2018 - 11:57 PM
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