If you had a chance to swap in a diesel engine and a tranny in the 100, what would it be?
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Cummins turbo diesel (6 cyl)) they put int he Dodge 2500 with Allison or American rear end they also use in the Dodge 2500. Easy to get parts...near bullet proof...and great performance for HP and mostly Torgue.....and mate that with a 5spd or 6spd auto tranny.

The Cummins inline 6 cylinder (ISB) 5.9 was used on dodge trucks from 2003 thru 2007.5 and is a beast of an engine. It was mated with 2 manuals (NV 5600 and Getrag G56) and 2 auto trannys (47RE and 48 RE) during that time pariod of the "3rd generation" dodge manufacturing years. Both autos are junk and Ive been down that road. To get them built with billet input shafts, output shafts, triple disk torque converter, and other parts is easily a 5k job to do it right with prices approaching 8k for a Goerend or Suncoast fully built tranny.
Those engines are super dooper heavy as are the trannys. I think for a LC the 4bt (same block with 4 holes instead of 6) may be a better choice but gosh amighty thats gonna be a costly conversion. Me , Im stickin with what the chinese kid in the math class came up with.![]()
How many MPG do you expect from a diesel engine in your 100?
the old TB's and Cummings are very reliable, but i am not sure that you can obtain more than 18 MPG in a LC100 with them.

There are a ton of older 6bt's to be found. The 190hp version that was in things like school buses and such. They aren't any more expensive than a SBC would be. Heavier... probably... more awesome? Definitely.
https://forum.ih8mud.com/expedition-builds/453887-long-overdue-rastarig-buildup.html
https://forum.ih8mud.com/hardcore-corner/84611-cummins-6bt-install-fzj80.html
https://forum.ih8mud.com/60-series-wagons/67579-shes-cummin-along-nicely.html
