cummins help

rpllr · May 1, 2012

hey guys looking for some advice on a 5.9 cummins engine, I am looking at putting a 5.9 cummins in my old gasser. I have found some in busses with an allison automatic pretty cheap, but i was wondering if the transmission could be changed to a dodge or if the engine will only accept the allison? basically is there an adapter at the bellhousing for different trans applications? thanks for any help

sixtyninegmc · May 1, 2012

The cummins B series has a flywheel housing on the back of the engine (not to be confused with the bellhousing) that is removable, and you can get them with different SAE bellhousing patterns, ford, chevy, dodge, and some other oddballs. Lots of different flywheels available as well. I would keep the Allison if at all possible, a stock gasser trans will not live long behind the 6BT, and the factory autos were not all that hot either.

Dblair · May 1, 2012

that bell housing for the Allison is worth a lot more than the bell housing for the Dodge . if you change the bell housing and the flex plate the Dodge auto may be used and will go in a older Dodge truck other wise the hump in the truck will be to small for an Allison transmission .

Mark - IN. · May 1, 2012

You kind of lost me. I have 5.9 Cummins in both of my '96 and '02 Dodge pickups. My '02 has an automatic, Dodge. The weakest link in the drivetrain in the Dodge pickups with automatics, is their automatic transmission. The Dodge warrantee covered my automatic at under 50,000 when I lost everything but first gear. After my 10 year warrantee expired and I lost everything again, a trans rebuilder rebuilt the same trans before I hit 70,000. My choice of mating a Cummins to anything would not be a Dodge automatic trans. If I had to adapt it, I would adapt it to something worth my money. I see that you are looking to get this out of a bus, school bus I'm guessing, and I know nothing about that Allison. I always thought that if Dodge could have mated the Cummins with the Allison that is mated to the Duramax, then they could have had something outstanding. I guess that when you say into your old gasser, you mean pickup? Fellas have been putting the 5.9 into tractors like Olivers for instance, but no need to a Dodge automatic transmission needed there.

What is your old gasser?

Mark

Jim in Ma. · May 1, 2012

I agree with sixtynine - Go with the allison

Hurst · May 1, 2012

Better check on what kind of Allison is in that bus. I'm willing to bet it's not and OD transmission, likely an AT545 4spd non OD transmission without a torque converter lockup. If that's the case, you will need some pretty low gearing in the rear end to get any speed out the truck, and that will come at the price of towing ability. Also, that Allison will take a few MPGs away, especially without a lockup TC. I would look for a manual transmission, probably an NV4500 would be the best band for the buck and you can get off the shelf parts to make it all bolt up.

Hurst

WJD · May 2, 2012

Check with your nearest Cummins Distributor (not dealer) they should be able to help you our with your question in an adaptor.
I know Cummins have several in their system.

cummins help

rpllr

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sixtyninegmc

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Dblair

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Mark - IN.

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Jim in Ma.

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Hurst

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WJD

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