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How do we know they are NOT connected together?

Did you drain the fluid yet? I posted a couple of Allison manuals. One of them explains how to check the fluid level. You need to verify how much fluid is in there. Since you say it blows out when its running, you probably haven't checked the level. If you drain the fluid out, and put it...

Maybe this will help.

Try this, pull the drain plug on the transmission and dump the fluid. See how much comes out; it should be about 4 gallons. If there's a lot more than 4 gallons, that might be your problem. Next, if you can drain the transmission and get the plug back in before the air leaks down great, if...

From your description of the problem, I doubt the problem is in the transmission other than too much fluid. The yellow pages would be a good place to find a towing company and also an Alison repair shop. On the other hand, you could try re-reading this thread and take some of the suggestions...

I did the same thing. Go to Walmart and buy one of the small hand transfer pumps and stick the suction hose down the fill tube on the transmission. Suck the excess out. The transmission must be at operating temp to show the correct level. Mine didn't blow fluid out when it was overfull. Is this...

Pull the transmission dipstick and see if there is air coming out of the tube while the engine is running.