damn, sounds like an expensive fix. mine clunks after its warmed up too.IIRC you can engage the CDL in 1st and 2nd when in 4hi, but once the vehicle shifts up to 3rd it disengages.
Should automatically engage in 4lo.
For the heck of it I’m going to engage mine before I go to work today as I have zero clunk when cold, after driving and warming up is when it starts.
Has to be something that is warming up, I just hope it’s not my transmission or TC.
Well I’ll be a monkeys uncle!
I went out and filled up my gas tank, got home and shifted it into 1st, engaged CDL and back and forth to reverse and NO clunk. Guess that means most of my play is in the TC/Ctr Diff?