727 sometimes not going in reverse

Thank you for your help! When pressure testing I stuck the air on front clutch and listened for the engage sound. This case has always seemed a little weak there, but then again it was dry. On the rear servo test I basically just hit it with air to ensure the servo engaged the rear band. You're saying I should hold it and see what air comes out eh?

Also on the needle jumping that sucked bounces up and down Like a pogo stick continuously. The rear servo is one of those billet jobs. Is it possible that rear servo hole is worn out to where it's not always getting a good enough seal even though it has a new seal?