Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am Cam.
You are feeling what is called Slip Bump. What is happening is the slip yoke into the transfer case or transmission is binding under power. The fix takes about an hour and if you can take it off, yourself and have a small file, then you can do this yourself. Using a small triangular file, file the edge of the splines in the slip yoke. 1-2 quick strokes is enough. You just want to smooth the corner off. Ideally you will not be able to see a difference, but when you clean it out and lube it with grease, then install it, that slip bump will be gone.
Slight layer of grease on the splines is fine, filling the yoke will push it into the transfer case.