73-87 Chevy _ GMC Trucks > Engine/Drivetrain

Clunk sound when in reverse

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JohnnyPopper:
2 or 4 wheel drive?

Captain J:

--- Quote from: JohnnyPopper on October 18, 2021, 03:27:12 PM ---2 or 4 wheel drive?

--- End quote ---
4 wheel drive K2500

JohnnyPopper:
Have someone shift from inside while you listen to isolate the location.

E-Brakes are your friend... ;)

Captain J:

--- Quote from: JohnnyPopper on October 19, 2021, 10:55:48 AM ---Have someone shift from inside while you listen to isolate the location. 👍🏻👋🏻

E-Brakes are your friend... ;)

--- End quote ---

bd:

--- Quote from: Captain J on November 15, 2021, 11:39:27 AM ---I did what you suggested (to put gear in N, parking brake on, check the shaft to check movement), the shaft moves from stop to stop less than 4-6mm, very minimal movement.
The transmission mount is factory original, have some cracks.
I may need to change it, but it’s not causing the loud clunk noise.

--- End quote ---

You never answered the earlier questions:  Does the clunk occur only when the engine is cold and idling fast or every time the transmission is shifted into reverse, both at operating temperature and cold?  Are the u-joints tight and serviceable?  Any evidence of rust tracks?

Disconnect the rear driveline from the transfer case.  With the transfer case in 2H and the transmission in park, using a pair of channel-lock pliers or similar to firmly grasp the transfer case output shaft, how many degrees of rotation stop-to-stop?

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