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#1 |
The Early Chevy Van Man
Join Date: Dec 2008
Location: Seattle, WA
Posts: 76
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truck 12 bolt posi question
Hey everyone.
I have a '65 GMC Handi-van with a truck type 12 bolt 3.73 gears in it. My van has 5 lugs. I came across an ad on the local craigslist where a guy is selling a 12 bolt posi out of a '62 chevy truck. (has 6 lugs). He thinks it has 4.10's but he is going to check and make sure. Will the posi unit out of the '62 truck bolt into the van's rear end?? Are the splines all the same on truck 12 bolts?
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64 Chevy Van 65 GMC Handi-Van 99 2500 silverado 4x4 ext cab |
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#2 |
Account Suspended
Join Date: Jan 2009
Location: galt ca,
Posts: 749
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Re: truck 12 bolt posi question
yes.
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#3 | |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: truck 12 bolt posi question
First the truck 12 bolt didn't come out until '63, so a '62 would have the old 10 bolt with the drop out 3rd member. Secondly the '63 & '64 12 bolts had 17 spline axles and coresponding side gears. The 30 spline axles started in '65 and were used thru the end of the 12 bolt in '79. The 5 lug bolt pattern on the 12 bolts started in '71 and went thru '79 in the C10's. Your '65 van has either aftermarket 5 lug conversion axles or has a '71 and newer 12 bolt under it. Hope that helps.
Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 10-27-2009 at 11:45 PM. |
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#4 | |
1 thing at a time is progress.
Join Date: Jun 2007
Location: Ball Ground GA
Posts: 5,511
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Re: truck 12 bolt posi question
Quote:
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Alan
Philippians 2:14-16 |
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#5 |
Registered User
Join Date: May 2009
Location: Loganville, Ga.
Posts: 1,408
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Re: truck 12 bolt posi question
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#6 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: truck 12 bolt posi question
Thanks guys
I guess after 34 years of working with these trucks, I have acquired a little knowledge on them. ![]()
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 10-27-2009 at 11:59 PM. |
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#7 | |
The Early Chevy Van Man
Join Date: Dec 2008
Location: Seattle, WA
Posts: 76
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Re: truck 12 bolt posi question
Quote:
Thanks for the info, but something is not adding up... I think the rules are different for the 12 bolts in the vans. I can tell you for a fact the 12 bolt under my '65 GMC Handi-van is factory stock 1965 and has 5 lugs, 4&3/4" bolt pattern like the musclecars. Also, this guy crawled under the truck while I was on the phone with him and told me it is a 12 bolt, and it is a '62. So.... ??? In any event, if that 12 bolt in the '62 has 17 splines, I don't think it will fit my little van. Here's a couple pics of my '65 GMC van just for fun:
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64 Chevy Van 65 GMC Handi-Van 99 2500 silverado 4x4 ext cab |
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#8 |
Account Suspended
Join Date: Sep 2009
Location: High Plains of Colorado
Posts: 2,485
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Re: truck 12 bolt posi question
Man those flat nose vans are awesome. Thanks for posting the pictures.
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#9 |
Registered User
Join Date: Oct 2008
Location: broken arrow oklahoma
Posts: 266
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Re: truck 12 bolt posi question
M 62 half ton came with a 10 bolt, and I switched it for a 67 12 bolt, maybe this guy had the same thing done to it before he got it.
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#10 |
Registered User
![]() Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: truck 12 bolt posi question
FWIW, I have seen some early truck 12 bolts that had Dana posi units rather than the Eaton unit. I don't know when the switch was made. (The rear I had was a 64) If it is a dana, I don't think any parts are available to rebuild it. At least when I tried, I couldn't find ANY parts for the Dana posi.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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#11 | ||
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: truck 12 bolt posi question
Ahhhh OK I was thinking of something like a step van. Yeah those vans had the 5 on 4.75 bolt pattern. I just don't remember for sure if they are based on the truck 12 bolt or passenger 12 bolt.....been a long time since I've seen one. I'm thinking it is truck based. The rear end in that '62 can't be the original if it is a 12 bolt, so it's hard to say what year it is. There is a code stamped in the passenger side axle tube that tells what the original application was. You could also pull the cover, and there is a date on the ring gear too. I don't know about those older vans, but the vans from like '71 or '72 and up have wider rear ends than pickups do.
Quote:
All of the Dana posi units that I've seen were of the 17 spline type ('63/'64). Those are some really stout posi units though. Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#12 |
Registered User
![]() Join Date: Mar 2008
Location: San Marcos, CA
Posts: 578
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Re: truck 12 bolt posi question
I second that as well!!! Thanks! I just cut and pasted that little tid bit of information for my files lol
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1964 Fleetside LWB 1995 Yellow Mustang convertible 1996 Camaro Z28 My build thread Looking for help on completing the Disc Brake Upgrade Reference Thread If you didn't build it, you don't really own it |
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#13 |
Registered User
![]() Join Date: Nov 2006
Location: Nashville, TN
Posts: 1,510
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Re: truck 12 bolt posi question
Cool van... you don't see those things everyday.
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#14 |
Registered User
![]() Join Date: Mar 2008
Location: San Marcos, CA
Posts: 578
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Re: truck 12 bolt posi question
Very cool van! It's in good shape too! I dont envy you having to find parts for it.
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1964 Fleetside LWB 1995 Yellow Mustang convertible 1996 Camaro Z28 My build thread Looking for help on completing the Disc Brake Upgrade Reference Thread If you didn't build it, you don't really own it |
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#15 | |
The Early Chevy Van Man
Join Date: Dec 2008
Location: Seattle, WA
Posts: 76
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Re: truck 12 bolt posi question
Quote:
Hahaha, yeah parts can be a bit tough to come by, nobody has a resto parts catalog for these things. Luckily I have a parts van!
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64 Chevy Van 65 GMC Handi-Van 99 2500 silverado 4x4 ext cab Last edited by kookykrispy; 10-29-2009 at 10:31 PM. |
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