Allison Transmission Leak

[gMw]

I have a 2002 Journey, Cat 330, Allison 6 speed (MD3000MH), about 30,100 miles on it…. Transmission last serviced at approx 25k miles…

While in a rest area last weekend, engine running, I noticed something dripping from the transmission area. I moved the coach forward and found the liquid was red, so suspected a transmission leak.

Today, applied a spray cleaner, and cleaned up the transmission. Waited for it to dry, then started the engine, and crawled under to see what I could see….

I found a leak, rear housing, at the output shaft end of the transmission. It’s not at a seam, I can’t see a crack (not saying there ain’t one, just I can’t see it). I used a paper towel to soak up the transmission fluid, and more immediately came out through the housing, same place.

Has anyone ever run across something like this?

Short of replacing the rear housing, any ideas how to stop the leak?

[RKL]

I would first check, using the control pad, to see if you have an overfill of trans fluid...If not it sounds like a seal on the shaft has broken or cracked...Sometimes driving it after it has sat for a long time will soften the seal and stop the leak....good luck, RKL

[edgray]

George: Just a friendly reminder to keep adding fluid to maintain the proper level until you get the leak stopped.

Allison says a slow leak that allows you to keep moving with too little fluid is more harmful than a sudden loss of all the fluid, which actually prevents damage by forcing you to stop.
ED

[gMw]

RKL.. Thanks for responding.. The leak is through the housing itself, not even close to a seal of gasket.

Ed... Once I found it was leaking, I immediately checked the fluid level, so far so good. But to be sure, I'm buying Trans fluid to carry just in case it's needed.