I use lube lockers for the 72 front and rear without an issue - no leaks, easy to remove and clean up and you usually can get 2-3 uses out of them if your careful.
I use the black oil resistant RTV on the 69 front and rear without any leaks or issues but takes a little time to clean and prep when you pull the 3rd member out or front diff cover. You don't need a ton of RTV, just 3/4 bead, make sure you go around the outside of the bolt holes and studs.
I use the black oil resistant RTV on the 69 front and rear without any leaks or issues but takes a little time to clean and prep when you pull the 3rd member out or front diff cover. You don't need a ton of RTV, just 3/4 bead, make sure you go around the outside of the bolt holes and studs.










