redhead 10 #1 Posted January 1, 2016 Have a question, can you change the o-ring and back up ring on a c-141, with Sundstrand still in tractor? Looks like you might have enough room but not sure, mine is leaking. If so how much oil would have to be drained. Thanks for all info you will give me in advance and HAPPY NEW YEAR Share this post Link to post Share on other sites