I'm beginning to map out a 12V engine swap for my F250, to begin this may, and I've got a tranny question for you all. How will my 4R100 auto hold up behind a '91.5+ 12V Cummins? I'd need to buy a flywheel, starter, and adaptor plate in order to run it. If I end up purchasing a complete truck rather than just an engine, I'll run the Dodge trans/t-case and just have a new driveshaft fabricated I suppose.

 

Well, i am thinking of heading the same route that you are, just about 6 months or a year behind ya. I dont know much about those transmission, but the mechanic that i was talking to about it said that on the several swaps he has done from the powerstroke to cummins have been straightforward and easy when you consider what your doing. The stock trans on the powerstroke is fine, but if your coming from a 5.4 like me it wont work. Easiest bet from what im hearing is to go with the adapter kits from this place called De-stroked and to be ready to spend on the nickel and dime parts that pop up.

-Jacob
"gone missin, back later"

 

Get a 4R100 from BTS and it will hold up fine. If you're wanting to drop in a 5.9, here's an interesting read for you. It tracks Jeremy's progress of his conversion. https://www.ford-trucks.com/forums/7...on-update.html

 

My budget is right around $10,000 so I don't know if I can afford a whole new trans. All said and done in order to adapt my trans./t-case to a 12V it would be around $1300; That's for an adaptor, flexplate, and 6.0L starter. Whereas it would be around $300 plus fabrication work (crossmember/mounts, shift linkage, etc.) to drop the Dodge trans/t-case in.