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Old 12-14-2010, 11:32 AM   #11
Mini-Skoolie
 
Join Date: Dec 2010
Posts: 17
Year: 1990
Chassis: International
Engine: 366 GM big block
Re: my 9.o wont get me above 50 mph

Saying that a 9.0L doesn't have the power to do above 50 on flat ground is a myth. They are no power houses by any means, but our scout troop used to have an '87 with the 9.0 that would do 75 on flat ground if you let it. This was a bus that was fresh out of school service with no modifications at all. If you want I can find out what gearing the thing had, I think it was fairly high. Also, on hills you should try manually downshifting the allison into third or second. Those old allison's are stubborn to downshift, and that does not mix well with a naturally aspirated diesel. We found that doing this made a big difference.
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