front driveshaft play excessive?

[cherokee chief]

I have a part time quadratrac case . When engine is started after sitting overnight there is no clunk while going into reverse with brakes applied. However, after a few times of going from drive to reverse it clunks. If my foot is off the brake its not as bad. The chain is stretched about 3/4 inch. I'm assuming that's part of it. Any time during the day when I go into reverse it'll clunk.
With the engine off and in park I can rotate the front driveshaft 1/2" - 3/4", and the rear 0". Is this caused by the chain stretch?

[paddyp]

Part of it is chain stretch, and part of it is due to the 10 spline tailshaft in the transmission/transfer case input. Clearances in the splines get sloppy, and it starts clunking, especially when going into reverse.

[Heavy_Metal_Thunder_81]

Ah yes, the ever terrible "quadra-clunk"

[cherokee chief]

I have a spare t-case with a good coupler. Would that help reduce the clunk?