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209 threads searching "overdrive transmission" . It includes Cummins swaps, gas swaps and several different model tranny swaps.
A Cummins swap from 7 years ago ;
New Cummins HMMWV project in the works!
https://www.steelsoldiers.com/search.php?searchid=6094248
And if read through and search the HMMWV forum you will probably come up with a 100 threads on it ,some with posts from the last few days. Also your comparing a "modern F350" to a 30 year old tactical truck with a turd for a motor.Most anything is possible if yoiur pockets are deep enough.