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Old 01-23-2021, 09:41 AM   #21
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 15,604
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
you got it right hot pure and simple. by the time you ran it till it wouldnt engage anymore she was quitew warm inside.. and then continuing to drive it backwards heated it up even more, a stiuck valve in the body is a good bet as to what happened.. you likely had quite a bit of clutch material go through that tranny as getting them hot will wear the clutches quite quickly. filling it up with fluid and then vibrating it down the road likely freed the valve and not it operates correctly (for now)..


when you run the fluid low in an automatic the pump sucks a mixture of air and fluid.. the fluid foams up and the line pressure is low. (if this is an AT545 they suffer from low line pressure anyway).. even low on fluid they will run in reverse and not forward as less of the valve body gets filled with fluid (more goes to the pan) so the reversing gear can operate even if the forward gears slip horribly. which when trying to make a trans drive forward and the engine just revs, you have an pply piston putting lackluster pressure on the clutches.. and you have clutches spinning with little to no fluid.. yeah she gets hot quick..



whether tha trans is destroyed or not remains to be seen. removing the pan and finding lots of gray / silver sludge in the bottom would be the true tell-tale sign if it was hurt at all..

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Old 01-27-2021, 03:19 PM   #22
Mini-Skoolie
 
Join Date: Oct 2010
Location: FT WORTH TEXAS
Posts: 14
Year: 1992
Coachwork: WARD / AMTRAN
Chassis: INTERNATIONAL
Engine: DIESEL
Rated Cap: 74
I have not read everything, but..

I bet that bus has air brakes, and if the engine is not running.....

Emergency brakes are locked up on the rear axle..
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Old 01-27-2021, 06:33 PM   #23
Bus Geek
 
Join Date: May 2014
Location: West Ohio
Posts: 2,607
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Quote:
Originally Posted by TXDRP View Post
I have not read everything, but..

I bet that bus has air brakes, and if the engine is not running.....

Emergency brakes are locked up on the rear axle..
No. It wouldn't move forward neutral or reverse if that was the case. It operates correctly in reverse, but won't move or be pulled in forward or neutral.
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