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71Blazer · 11-21-2003, 08:21 PM

What would cause a front driveline "thunk" that increases with speed when 4WD is engaged. The transfer case also has a tendency to pop out of 4Lo.

I've replaced the u-joints at both wheels in the front axle and the entire front driveshaft out of necessity. I half hoped that might take care of the mysterious "thunk" too.

It's still there, any ideas?

11-21-2003, 08:21 PM	#1
71Blazer Goodbye Darlin' Join Date: Nov 2001 Location: Coupeville, WA USA Posts: 330	front driveline "thunk"? What would cause a front driveline "thunk" that increases with speed when 4WD is engaged. The transfer case also has a tendency to pop out of 4Lo. I've replaced the u-joints at both wheels in the front axle and the entire front driveshaft out of necessity. I half hoped that might take care of the mysterious "thunk" too. It's still there, any ideas? __________________ 1971 Blazer CST SOLD!