My 5th gear has always felt different than the others as well, almost like it hangs for a second before going in gear. I noticed there is a TSB for the G56's jumping out of reverse, and it gives a caution not to disturb the 5th gear synchro, as it can easily come apart when the reverse syncro is removed. I'm not sure how all that is layed out in the transmission, but I have wondered if their is a reverse/5th gear connection. My truck will loudly pop out of reverse sometimes, but I've not had a chance to get it taken care of yet. The TSB number for "Transmission Jumps Out of Reverse" is 21-006-06. Thanks.