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Go Back   Dodge Cummins Diesel Forum > 1st Gen. Dodge Cummins 89-93 12V Forums > 89-93 Powertrain
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 02-11-2010, 03:04 PM   #1 (permalink)
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Enigne Swap

OK guys I need your help, I am wanting to do an engine swap on a 79 model pace arrow motor home I have.
It currently has a crysler 400 v8 in it right now a chrysler automatic tranny too. I have the opportunity to buy a 91 model 12 valve cummins. My question is has any one done this type of swap? Would a one ton in 79 have the same tranny as one in 91? What would I need to get. Any ideas would be greatly appreciated. websites for parts would be great to. If I can get this project going Ill take pictures and post them on here for everyone to see.
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Old 02-11-2010, 05:34 PM   #2 (permalink)
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I put a 5.9 with a allison in a 75 dodge travco it is not fun if you use a non intercooled motor with a 518 overdrive trans it would be allot easier the motor mounts will work & I used a radiator out of a pace arrow & have no cooling issues but you will have to change the rearend gears to 3.73 or 3.54 depending on tire size
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Old 02-12-2010, 05:11 PM   #3 (permalink)
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Sounds like I'm getting in over my head!! What i'm really trying to figure out is if I can leave the transmisson that's in the motor home in there and just bolt the cummins up to it. Will it match up?
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Old 02-12-2010, 08:41 PM   #4 (permalink)
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if i had things that far apart, id at least have the trans gone through. The torque converter in any stock auto regardless of the year is not well matched to the Cummins torque curve. Plus the stock trans in the motorhome is a non overdrive unit, which will, just like the pickups, will leave the cummins at a higher than happy rpm.

The ideal setup would be a pre 91.5 NON intrcooled engine, an A518 overdrive automatic with a good aftermarket torque converter and 4:10 or 3:55 rear end gears.
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