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Discussion Starter #1
I am going to do a conversion on my 98 Durango. I am trying to decide between a 5.7 HEMI, a built big block of some flavor (383,426,440, or maybe a "hybrid" 400 with a 440 crank). Maybe a 3.9 Cummins with a P-pump, or a 5.9 Cummins of undecided flavor.

I have pretty well ruled out the 5.7 HEMI. There is sooooo much more that can be done with a big block. I would love to build a MPFI big block, and adapt a 47RE overdrive on it.

The route I will probably take is the Cummins though. I would love to have the ultimate in power AND mileage, and the Cummins seems the best choice. I want to do a 5.9 for the power, but the lighter weight 3.9 is definately interesting to me. I like the idea of having a lightweight engine for off roading but still be able to pull down some serious power and mileage. Should be able to get 500RWHP out of the 3.9 and still pull off 25+ MPG.
 

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Stuff this EFI elephant motor tween the frame rails...

 

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Discussion Starter #3
While that would be cool, a gen II HEMI is out of the budget.lol
 

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Discussion Starter #4
Well, looks like its going to be the Cummins 3.9. I got the engine home today, so I guess the build will begin tomorrow.
 

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I have a 2002 Durango and a 99 Ram 2500 with a Cummins.
Good choice.
With the weight of the ISB 5.9 Cummins and what it does to the ram front end, you would have to come up with a much better steering / susp setup than what you have in the durango. I would think 3.9 to be ok though.
Kevin
 
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