1999 GMC 2500 4x4 12V cummins swap - Diesel Bombers

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Old 09-14-2011, 07:58 AM
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Join Date: Sep 2011
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Default 1999 GMC 2500 4x4 12V cummins swap

Hello, I'm considering swapping my 6L vortec out for a 12V cummins i have in my 92 dodge. I have done a small amount of research and found i can almost buy everything to make it a bolt in process(motor mounts, adaptor plate, flywheel, transmission controller, ect...). I haven't actually located any threads that had someone doing a swap on my style truck, so i'm wondering on what fab issues i may run into. It seems a lot of people change the transmission along with the motor, but i plan to keep mine the same(4L80). I'm wondering if i buy a duramax front bumper and intercooler if it should work? Will i have to modify some of the cross-members? Any information would be greatly appreciated! thanks!
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Old 09-14-2011, 12:10 PM
geddy's uncle's Avatar
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Join Date: Sep 2010
Location: Keller, TX
Posts: 415

Don't know about the various frame/mount mods, but, there's a company that makes just about every possible bell-housing imaginable for bolting up a tranny to the back of a Cummins. You might also source one from the worldfamous "bread truck" that's often powered by a 4BT and has a TH400 trans.

somebody's probably already done it, though...maybe he'll happen along and give more (better) information.
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Old 09-22-2011, 05:13 PM
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Join Date: Dec 2010
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you might go an look into autoworld with there motor mounts. and is it 4x4 or 2x4?
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Old 10-15-2011, 06:01 PM
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Location: Lincoln, CA
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is the 99 the 88-98 square body style still or the 2000 up body style
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