Ed
The noise only occurs when driving. It does not occur when I let up on the gas, a little or punch it and let up. It only happens when I let up all the way (basically remove my foot). Most noticeable (probably due to road noise) when going about 35 and I take my foot off the accellerator. One moderate thunk at that exact time every time. It doesn't affect drivability, but I want to fix if it will. My list is:
Check motor, tranny and xfer case mounts
Check driveline wiggle
I don't think it's the linkage. It's a heavier noise than that.
Thanks so much for your input.