12 bolt info - Pirate4x4.Com : 4x4 and Off-Road Forum

bignissan · 12-13-2002, 03:32 PM

i have the opportunity to pick up a 12 bolt out of a mid 70's chevy half ton. will if work in my 85 gmc half ton? spring perches aren't a problem, just wondering about the width. thanks.
greg

El Jefe · 12-13-2002, 05:44 PM

Yep. The only difference may be the driveshaft yoke.

fr8train · 12-13-2002, 06:11 PM

It will work.

bignissan · 12-14-2002, 12:00 AM

is the bolt pattern the same? i think i remember that the 70's are 5x5 and i think mine is the 5x5.5"....is that correct? or is mine 5x5 as well? it's tough to measure without pulling the wheel, which i don't feel like doing...thanks
greg

CJ-Jeeper · 12-14-2002, 04:46 PM

I don't know of Chevy useing 5x5.5" on anything.
But then, I thought all Chevy 1/2 ton 4x4's were 6 lug, so what do I know.

bignissan · 12-14-2002, 10:21 PM

ok cool , you're right.....this is a 2wd though.... thanks
greg

reddwarf · 12-15-2002, 09:01 PM

Your 85 has either a 3r series Saginaw joint (auto tranny) or a 1350 series joint (granny 4 speed). The 12 bolt has a 1310 series joint. There are conversion u joints from Spicer and NAPA (don't buy the NAPA ones, their needle bearings are junk).

bignissan · 12-16-2002, 08:50 AM

thanks!
greg

12-13-2002, 03:32 PM	#1 (permalink)
bignissan Registered User Join Date: Oct 2002 Member # 14644 Location: Magnolia, Texas Posts: 2,015	12 bolt info i have the opportunity to pick up a 12 bolt out of a mid 70's chevy half ton. will if work in my 85 gmc half ton? spring perches aren't a problem, just wondering about the width. thanks. greg __________________ 1986.5 Nissan crawler - dual cases, one tons, 42's... 2003 SV650 1997 F350 DRW PSD

12-13-2002, 05:44 PM	#2 (permalink)
El Jefe Registered User Join Date: Oct 2002 Member # 14072 Location: Aurora, Colorado Posts: 816	Yep. The only difference may be the driveshaft yoke. __________________ Thus far you have been adrift in the sheltered harbor of my patience.

12-14-2002, 12:00 AM	#4 (permalink)
bignissan Registered User Join Date: Oct 2002 Member # 14644 Location: Magnolia, Texas Posts: 2,015	is the bolt pattern the same? i think i remember that the 70's are 5x5 and i think mine is the 5x5.5"....is that correct? or is mine 5x5 as well? it's tough to measure without pulling the wheel, which i don't feel like doing...thanks greg __________________ 1986.5 Nissan crawler - dual cases, one tons, 42's... 2003 SV650 1997 F350 DRW PSD

12-14-2002, 04:46 PM	#5 (permalink)
CJ-Jeeper Rock God Join Date: Oct 2000 Member # 2095 Location: Belmont / Modesto, CA Posts: 1,344	I don't know of Chevy useing 5x5.5" on anything. But then, I thought all Chevy 1/2 ton 4x4's were 6 lug, so what do I know. __________________ '79CJ5,soa,d44/60,t18,d18w/Obrian 3.6low,5.13's,35x14.5SSR's '02 Z71

12-14-2002, 10:21 PM	#6 (permalink)
bignissan Registered User Join Date: Oct 2002 Member # 14644 Location: Magnolia, Texas Posts: 2,015	ok cool , you're right.....this is a 2wd though.... thanks greg __________________ 1986.5 Nissan crawler - dual cases, one tons, 42's... 2003 SV650 1997 F350 DRW PSD

12-13-2002, 06:11 PM	#3 (permalink)
fr8train Registered User Join Date: Aug 2002 Member # 13175 Location: Maryland Posts: 74	It will work.

12-15-2002, 09:01 PM	#7 (permalink)
reddwarf Registered User Join Date: Jun 2001 Member # 5306 Location: Melrose Fla Posts: 2,133	Your 85 has either a 3r series Saginaw joint (auto tranny) or a 1350 series joint (granny 4 speed). The 12 bolt has a 1310 series joint. There are conversion u joints from Spicer and NAPA (don't buy the NAPA ones, their needle bearings are junk). __________________ "I'm ridin like a felon" -- Doug

12-16-2002, 08:50 AM	#8 (permalink)
bignissan Registered User Join Date: Oct 2002 Member # 14644 Location: Magnolia, Texas Posts: 2,015	thanks! greg __________________ 1986.5 Nissan crawler - dual cases, one tons, 42's... 2003 SV650 1997 F350 DRW PSD

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