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Old 07-11-2010, 03:55 pm   #1
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CM Drivetrain clunk
I have a 94, 6 speed coupe with 110K on it. I've been chasing a clunk in the drivetrain for a while. From a very easy start I get a deep sounding clunk when I let the clutch out with very little gas. I can repeat it if I'm on a slight incline. It's like there is slack in the drivetrain. A couple of years ago I replaced all the U joints thinking that was the problem. That wasn't it. The suspension is tight because last fall I completely rebuilt the suspension using poly bushings, new ball joints and new tie rod ends. The Bilstien shocks were rebuilt at the factory. Any suggestions on where to start? Thanks!
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Old 07-11-2010, 10:36 pm   #2
 
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When you say "all the u-joints", you mean the drive shaft AND the half shafts?
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 07-11-2010, 11:03 pm   #3
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That is correct. I replaced the U joints in the drive shaft and the rear half shafts.
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Old 07-12-2010, 01:06 am   #4
 
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I'm leaning toward a TO bearing, or flywheel bolt problem.

How's the clutch fork look? How are your motor & trans mounts? Exhaust system? Anything loose or broken there could make such a noise.
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 07-12-2010, 11:30 am   #5
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HI there,

Or something in that driveline is loose.

I have seen arms with worn bushings create a noise like that.

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Old 07-15-2010, 10:27 am   #6
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C4C5 guy,
I relplaced all the bushings with polly busings last fall. U joints 2 years ago. Everything seems tight. Any other thoughts?
Thanks
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Old 07-15-2010, 10:55 am   #7
 
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How are your sway bar links? I broke a bolt once and it made that noise.

Have you serviced your differential lately?
1985 Z51 4+3 trans rebuilt 5.7 TPI,(.10 over) w/ CompCams 12-262-4, 52MM Throttlebody, underdrive pulleys, reworked heads, Hypertech Thermomaster chip, & cat back exhaust
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Old 07-15-2010, 02:40 pm   #8
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Sway bar links are all ok. They all have new bushings. I havent' serviced the differential and I've had the car from 80k to 110K. Thanks
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Old 07-15-2010, 03:57 pm   #9
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HI there,

Im still leaning towards something loose.

Every single bolt needs to be checked.

Torque to specification and then evaluated for noise with a Chassis ears.

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Old 07-15-2010, 04:12 pm   #10
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Chassis ears?????? What's that?
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