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View Full Version : Cummins Turbo Deisel Swap

vintagetrks
09-19-2009, 09:43 PM
Has anyone put a cummins turbo diesel into their FSJ? If so how difficult of a swap is it and what kind of mileage does it get? Does it mount up to the trans or does that have to be heavily modified?
recycledj10
09-19-2009, 09:55 PM
Some people make it sound it would easier to swap the whole frame under the jeep. I was told those engines are heavy,

Wait a sec are you talking about the 4bt are 6bt?

The 4bt fits nicly in the engine bay but your stock trans won't bolt up to it, are even hold up to the extra power. If you play your cards right and measure you could probaly run the 4bt whatever trans to that and an adapter to the trans and then your stock transfer case. Then maybe you won't need new driveshafts if you lay the engine in the right position.
Bill Moore
09-20-2009, 03:13 PM
Some people make it sound it would easier to swap the whole frame under the jeep. I was told those engines are heavy,

Wait a sec are you talking about the 4bt are 6bt?

The 4bt fits nicly in the engine bay but your stock trans won't bolt up to it, are even hold up to the extra power. If you play your cards right and measure you could probaly run the 4bt whatever trans to that and an adapter to the trans and then your stock transfer case. Then maybe you won't need new driveshafts if you lay the engine in the right position. depends on what you have already, T400, you can swap to a chevy t400, and put the jeep tailshaft on to keep the rest of the drive train stock, if manual go for the nv4500 or sm465
Jim Blair
09-21-2009, 01:06 AM
http://www.4btswaps.com/forum/index.php
dusty
12-04-2009, 01:44 PM
yes see my sig. for link to the build
gotmike
12-04-2009, 09:37 PM
yeah... i've got the 6BT in mine... but i did the trick of swapping bodies and modifying the frame... the dodge frame is much heavier than the jeep frame...
J10Mike
12-04-2009, 09:50 PM
If staying with an auto transmission, a GM tranny adapter with tilt (expensive) and 700R4 tranny will work. Or, you could find a Dodge tranny adapter (cheap), Dodge 727 or A518 (46rh with O/D), and Dodge NP205 from a 89 thru 93 Dodge Cummins truck.
If it were me, I would use the Dodge components to do a CTD 6bt or 4bt conversion. They can be had much cheaper.