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Old 10-27-2021, 11:56 PM   #1
Join Date: Jun 2020
Posts: 36
Losing trans fluid

I have a 1997 dt466 with an automatic Allison 2000 transmission.

When I check the trans fluid it shows pretty low on the dip stick. I add a couple quarts and it reads normal. I'll drive around, park it. Then when I check it before starting it's low again.

There's no leaks on the driveway. No weeping lines.

Anyone had a trans fluid leak with no obvious leak?

ttee is offline   Reply With Quote
Old 10-28-2021, 01:35 AM   #2
Join Date: Aug 2021
Location: Santa Fe
Posts: 49
Year: 2007
Coachwork: Thomas
Chassis: 31 ft. HDX
Engine: CATC7
Rated Cap: 36,300 GVW
How much fluid does the transmission hold ? I think my Allison 3000 holds 5 gallons?
So the low mark on the stick might be a gallon from full.
Make sure you check the fluid in the same level spot.
Good Luck!
jimmythomas is offline   Reply With Quote
Old 10-28-2021, 11:30 AM   #3
Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 2,696
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Well, for starters, you check the fluid on allisons with the bus running and in neutral. So if you're checking before you start it, that's your issue. Check it with it running.

Second, fluid level can vary on the dipstick based off of temperature. They'll either have 2 crosshatch areas for both cold and hot fluid temps. OR one crosshatch area for hot fluid. If the fluid is cold and not in the crosshatch area, I typically wouldn't worry, so long as the level is on the stick and not in the "add" area.

The only "phantom" place a transmission can leak is through the cooler, but the lost fluid will appear into the coolant. ATF floats on the coolant, especially several quarts, so if the reservoir and radiator aren't overfull and show none, you can rule out the cooler leaking.
My build: The Silver Bullet
Booyah45828 is offline   Reply With Quote

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