I use the silicone on my vacuum hoses,I recently swapped all my old vacuum hoses with silicone hoses and I guess I mustve had a vacuum leak because now my rig is shifting alot smoother(auto) and seems to have more pep.The silicone will last forever i just dont know how the hold up to hot water.
HEY!!! thanks alot very helpful,i was having vibrations on de-celeration and my u-joints were fine...so i decided to change out my drive-shaft like you did and it fixed it...oh yeah my vibrations started happening right after a 3"lift and most noticeable after reaching a speed of 50 mph...