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01-13-2015, 04:28 PM | #1 |
Junk Yartist
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,203
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Re: K30 Downgrade to Cummins Project
My bone stock cummins tows just fine in overdrive with 3.55s. I think you'll want the 3.73s. We ran an '05 10.5 AAM on the 82 frame for my brothers crewcab. We had to relocate perches and shock mounts. I've also noticed the limited slip GM uses now (still has the RPO G80) is a different and more reliable design.
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-Jeremy YOU ONLY FAIL IF YOU STOP TRYING 70 Crew Cab Build Link 70 GMC Suburban 4X4 build thread 95 Yukon Daily Driver Rebuilding an NP205 |
01-13-2015, 05:53 PM | #2 | |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: K30 Downgrade to Cummins Project
Quote:
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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01-13-2015, 06:47 PM | #3 |
Junk Yartist
Join Date: Jul 2009
Location: Greeley, CO
Posts: 2,203
|
Re: K30 Downgrade to Cummins Project
The 11.5 AAM has the different limited slip. As for the perches, ditch the stock crap. I know it's a more abusive environment, but the government trucks in our fleet needed the perches built up from wear. They are rounded on the edoes and allow for more movement. I wasn't happy with the aftermarket ones my brother bought either. I would have rather made my own. I'll be running a ladder bar setup on his for added strength
__________________
-Jeremy YOU ONLY FAIL IF YOU STOP TRYING 70 Crew Cab Build Link 70 GMC Suburban 4X4 build thread 95 Yukon Daily Driver Rebuilding an NP205 |
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