A friend of mine did it about three years ago, and I just bought it. He took the engine, trans, transfer case, radiator, etc. from a '91 Dodge. It fits tight, but not so tight that there's any problems from it. There's about an inch between the fan and rad. He had to "modify" the firewall a bit with a hammer. The Chevy condensor is till there and the A/C works, using the compressor that was on the Cummins. He used the PS pump on the Cummins with the GM steering box. Also used the vacuum pump on the Cummins and converted the truck from hydroboost to vacuum brakes. The brakes work super. He made brackets to mount the rad. Pretty sure it has the Dodge tranny crossmember. Dodge hydraulic clutch parts adapted to the Chevy pedal. Chevy dual tanks feed the Cummins transfer pump. That's all I can think of right now. If you have any more questions, I'll answer or ask him if I don't know. I really think I have the best of both worlds now - A Cummins in a Chevy. Had a '93 Dodge W250 club cab Cummins truck, my only Dodge after many Chevys, and sold it to get this one. I use it as a daily driver and for pulling my 13,000 lbs. of gooseneck trailer with my Jeep, camper, etc. on it.
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Hauler - '79 K30 Silverado crew cab SRW, Cummins, 5 spd, NP205, D60, 14 bolt, 4” lift
Crawler - '80 CJ-7, 350 TBI, SM420, D300, D60, Eaton rear, 3 link, etc.
Beater - '78 K20, 350, TH400, NP203 w/part time kit, D44, 14 bolt, plow and dump bed, 4” lift
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