The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Rochester QuadraJet 4bbl Carburetor issue

Dead Parrot · 06-03-2021, 10:46 AM

If it only clunks in 4 wheel drive, suspect the X-fer case or forward drive train.
If it clunks in both 2 & 4 wheel drive, suspect the rear drive train.

Possible that since your idle is fixed, the clunk will largely go away. Even a new drive train has enough slop that switching from D to R or back at high speed can make a noise.

06-03-2021, 10:46 AM	#32
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,489	Re: Rochester QuadraJet 4bbl Carburetor issue If it only clunks in 4 wheel drive, suspect the X-fer case or forward drive train. If it clunks in both 2 & 4 wheel drive, suspect the rear drive train. Possible that since your idle is fixed, the clunk will largely go away. Even a new drive train has enough slop that switching from D to R or back at high speed can make a noise.