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I have a 1987 chevy mid sized converted school bus with an 8.2 DD and an alisyon transmission.
It runs great and I love the conversion, but it is just too underpowered and slow. The rear end is a 5:38 ratio and at 3000 rpm the speedometer says 59 MPH and thats it!
I am mechanicaly handy (with gas stuff) and want to repower my bus with about 300 HP and want to make it as simple as possible, what will fit the automatic trans bell housing and have the converter connect to the repower motor flywheel? or, what motor trans combo would you suggest.
Will the Cummins out of a Dodge pickup get the jobe done?
I need Help here men, I also know that I will be changing the rear ratio with a Cummins or a Cat due to the reduced RPM that they make their power at.
A detroit 8.2L bolt to a SAE #2 bell housing.
You need to find out what is the rating of the engine you got now.
The 8.2L can be tune up to 250HP. & that would make hat bus fly, but the rear end is too slow.
Depending on the weight of your bus, you may have enough power but just too slow.
Running 8.2 to max RPM, it will break it's crankshaft one day.
The smooth spot should be around2400-2600.
In order to drive@ 80MPH @ 2400 with 11/22.5 tires(500 revolution per mile)
you need a rear end ratio of 3.55.(& to get that ratio, you may have to change the housing)
Formula used for the following calculations:
RPM / RE ratio x 60 / revs per mile).
wrench
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