Forum Discussion

Snomas's avatar
Snomas
Explorer
Mar 21, 2014

Trans output shaft leaking. Need opinions.

A mechanic noticed that my allison trans output shaft seal is leaking but I never have had to add trans oil. Can anyone tell me if this is serious and if it should be fixed right away?
  • With your coach/air bag suspension, VERIFY RIDE HEIGHT!

    That very short driveshaft is sensitive to out of spec ride height.

    Your chassis maker can provide you with the specs.

    Be sure to have jack stands under it before checking/changing ride height-- you don't want to drop the coach on you!
  • It can be seating a little and go on for many years. If it doesn't drip and if you look at it and it's dirty, it's probably fine. If it's clean and wet then it's time to replace it.
  • If no puddles when level and you don't have to add fluid I would just keep an eye on it.
  • Thanks for all the oopinions. There is no fluid on the ground. I did have the MH parked on a hill (5 degrees) and did get some trans fluid on the ground after prolonged storage but no leakage on the ground when sitting level! Maybe this is what the mechanic is referring t.
  • Snomas wrote:
    Can anyone tell me if this is serious and if it should be fixed right away?
    I've seen tractor trailers go many, many, thousands of miles like that. Just keep a eye on the level of the fluid.
  • Is this a trusted mechanic? If not then I would keep an eye on it and if it's actually leaking. Perhaps your guy is trying to pull a fast one on you.
  • If the fluid level has not drop, clean and watch. Could have been sprayed so that the seal would look like it needed replaced. Just saying.