Rear end clanking noise
01-13-2019, 05:00 PM
#1
Racer
Thread Starter
Rear end clanking noise
There’s a bad bad noise coming from the rear end on Limpy (1983 944). Supposedly has 65k miles on it. Left side rear bearing was replaced by PO, and he said the RR is going bad too. We had Limpy off the ground yesterday for new shocks, and didn’t hear the clacking with the engine turning the wheels in the air. I’m used to a roar for a bad bearing, and there is a minor roar, but this clacking has me confused. It seems to correspond with hops in the speedo too.
Any ideas? Just a bad bearing?
Any ideas? Just a bad bearing?
01-13-2019, 05:17 PM
#2
Drifting
There’s a bad bad noise coming from the rear end on Limpy (1983 944). Supposedly has 65k miles on it. Left side rear bearing was replaced by PO, and he said the RR is going bad too. We had Limpy off the ground yesterday for new shocks, and didn’t hear the clacking with the engine turning the wheels in the air. I’m used to a roar for a bad bearing, and there is a minor roar, but this clacking has me confused. It seems to correspond with hops in the speedo too.
Any ideas? Just a bad bearing?
Any ideas? Just a bad bearing?
01-14-2019, 12:31 AM
#3
Racer
Thread Starter
Is the stub axle the shaft with the CV joints? If so, then when you say to hold it and rotate the tire, is the purpose to “load” the CV joint to make the bad portion of it click? We tried this unloaded with the rear tires off the ground and the clanking noise wasn’t noticeable. I can try it again adding resistance to the half shaft with my hand while rotating the wheel if that’s what you’re suggesting.
Thanks,
Camelman
Thanks,
Camelman
01-14-2019, 08:20 AM
#4
Drifting
Is the stub axle the shaft with the CV joints? If so, then when you say to hold it and rotate the tire, is the purpose to “load” the CV joint to make the bad portion of it click? We tried this unloaded with the rear tires off the ground and the clanking noise wasn’t noticeable. I can try it again adding resistance to the half shaft with my hand while rotating the wheel if that’s what you’re suggesting.
Thanks,
Camelman
Thanks,
Camelman
01-14-2019, 09:22 PM
#5
I have lost a couple of these CVs and they would sort of groan when turning on the interstate on ramps. I just bought a new half shaft and bolted it back in place. Finding the cheesehead wrench to remove those bolts on each end will take longer than the actual repair. Even if you know the wrench is somewhere in your garage from last time u did this job! Lol
01-14-2019, 09:40 PM
#6
Nordschleife Master
I’ve heard a bunch of noises from the rear however damaged cv’s, loose axles, bad trans, rear wheel bearings, etc don’t imo “clank”. The only thing back there that would make a clanking sound would be either a loose muffler or muffler heat shield.
01-15-2019, 12:29 AM
#7
Racer
Thread Starter
The noise doesn’t jibe with bad bearings from my experience, but it does correspond perfectly with rotation of the rear wheels. The speedo needle also bounces in concert with the clang from the rear, but I don’t know if there’s any relationship there. I need to try T&T’s suggestion of loading the axle shaft while turning the wheel.
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01-15-2019, 06:32 AM
#8
While you are back at the transmission area, double check the rear drive shaft clamp to transmission input shaft. You have to remove the rubber plug in the aluminum flange to get at the clamp. The bolts sometimes get loose or were not tightened correctly if it was loosened before for other work. The two bolts should be tightened to 59 ft. lbs. and a good torque wrench should be used.
A loose clamp can make this clanking noise.
HTH.
A loose clamp can make this clanking noise.
HTH.
01-16-2019, 04:33 PM
#9
The noise doesn’t jibe with bad bearings from my experience, but it does correspond perfectly with rotation of the rear wheels. The speedo needle also bounces in concert with the clang from the rear, but I don’t know if there’s any relationship there. I need to try T&T’s suggestion of loading the axle shaft while turning the wheel.
01-16-2019, 04:41 PM
#10
Racer
Thread Starter
What exactly do you mean by "tranny ring gear housing"? Which part did you specifically damage to cause this noise to happen? I discovered we have an open diff, so I'm leaning towards getting a limited slip anyway, If there's something wrong with the structure of our differential, then I'll focus on a completely new trans as opposed to swapping in an LSD.
01-16-2019, 05:59 PM
#11
Drifting
What exactly do you mean by "tranny ring gear housing"? Which part did you specifically damage to cause this noise to happen? I discovered we have an open diff, so I'm leaning towards getting a limited slip anyway, If there's something wrong with the structure of our differential, then I'll focus on a completely new trans as opposed to swapping in an LSD.
01-17-2019, 05:56 PM
#12
What exactly do you mean by "tranny ring gear housing"? Which part did you specifically damage to cause this noise to happen? I discovered we have an open diff, so I'm leaning towards getting a limited slip anyway, If there's something wrong with the structure of our differential, then I'll focus on a completely new trans as opposed to swapping in an LSD.