Quote Originally Posted by Big J
read this, get smart

http://findarticles.com/p/articles/m...2/ai_n21428028

A properly peened gear set will last way longer than a non peened gear set set to the same clearances, end of story.
im not saying a shot peened gear set isnt going to last longer with the same clearances.... thats what im trying to get at... it has to be the same clearances because that little slack is what is going to kill the gears otherwise. of course they will last longer when shot peened. but shot peen makes the parts smaller ever so slightly... clearances do change when shot peened.