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Old 10-29-2015, 10:43 PM   #6
ElGracho
Gentleman Jim Driver
 
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Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,554
Re: Differences in driveline length between 10&12 bolts?

Quote:
Originally Posted by Tx Firefighter View Post
I've never needed to modify length, but the u joints are different....
Some 12 bolts have 3r yokes like a 10 bolt. I have one I just swapped into my 85. I think it came from a 1979 or 1980 suburban. 3.40 posi...

I didn't change anything with the driveshaft but I do think it was out of the trans about 1/4" more than it was with the 10 bolt.
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Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '87 C10, '87 R30, 2 '89 R3500 Flatbeds
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