Originally Posted by jomichael
...I don't think a 4 cylinder diesel would pull my 4x4?..

I think the right one will.
Not the right choice for your truck, but the 4 cylinder in my 2 ton will have no problems going down the road and hauling a load too.

If you're serious about a Diesel swap I suggest you look closely at a Cummins 4BT, which is essentially 2/3 of a Dodge Cummins engine.
Lots of reading and ideas here at www.4BTSwaps.com

One issue you may have is axle gears, if your NAPCO front axle is geared slow with no faster options you may or may not be able to get enough overdrive in there to make it worth while.
Proper gearing is the key to a successful diesel conversion, before buying a single part ensure that you can make the gearing work. Typically Diesels run slower than the gas engines they replace and need faster gears to be both economical and enjoyable on the highway.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-