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#1 |
Registered User
Join Date: Aug 2010
Location: Springfield, Oregon
Posts: 164
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12 bolt car vs. truck
Ok it's been a really long time since I've been on here....but it's good to be back!!! Anyway I am back working in my C10 and I was getting the parts lined up for the rearend and was reading about the difference in car vs. truck and I don't know what I have....it was given to me not with a rig so I'm worried and I don't quiet understand what is different....is the housing? Or the internals? Or all of it? I was going to replace everything but the housing pretty much....new 5 lug axels and an rayon posi unit with new gears....but I'm scared of buying missmatched parts...I have tried to search on here and the Internet with bono luck so hopefully I didn't miss a lot...but anyway thank for your help!!! You guys are the best if the best
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-1969 C/10 Short Step soon to be Brand NEW Ls6/T56 ![]() -03 Mazda Protege 5 -WTB 1970 Chevelle project |
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#2 |
Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,587
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Re: 12 bolt car vs. truck
Nothing interchanges expect maybe a few gaskets, and their gear ratio's are a bit limited by comparison.
They are two different rear ends, and the car is better in nearly every way. If I am not mistaken the 8.5 10 bolt is stronger in more ways too then the truck 12 bolt. |
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#3 |
Registered User
Join Date: Dec 2008
Location: NW-Ohio
Posts: 2,525
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Re: 12 bolt car vs. truck
Most of the BOP ones are nice for a shell because its 4 link ready, first thing you do to a race car and off road truck, 4 link system. on the cars it just wasn't adjustable with stock arms.
just be careful for the 8.75 10 bolt cover with a 12bolt carrier inside, lots of those are posi [got one] but no one makes parts and no parts from others will fit. [you can reuilb the posi] can't even get the right 10bolt cover gasket, as its bigger then a 10bolt, but strong as a tank. |
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#4 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 12 bolt car vs. truck
1. Chevy car 12 bolt.
2. Truck 12 bolt. |
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#5 | |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 12 bolt car vs. truck
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#6 |
Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,587
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Re: 12 bolt car vs. truck
I've heard the axles are slightly better, and usually have more teeth. Also the main caps are supposed to be a touch better.
If my truck had one I wouldn't rip it out, and I would actually build it up a bit. There fine for just about anything thrown at them. Except 500+ HP, and sticky tires. Or heavy off-roading. |
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#7 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 12 bolt car vs. truck
The 12 bolt car and truck both use 30 spline axles. The 12 bolt car gears can actually be used in the truck housing. There is a thread on this forum in the "Racing and High Performance" section with the bearing number to make it work.
There are actually a few members here that race their trucks and are still running the truck 12 bolt.
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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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#8 |
Registered User
Join Date: Aug 2010
Location: Springfield, Oregon
Posts: 164
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Re: 12 bolt car vs. truck
So how do I know what I have? I am assuming the housing are different...so do they measure out different? I'm fine running a truck 12 bolt I just wanna make sure I get the right parts
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-1969 C/10 Short Step soon to be Brand NEW Ls6/T56 ![]() -03 Mazda Protege 5 -WTB 1970 Chevelle project |
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#9 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 12 bolt car vs. truck
The rear covers are shaped different....Did you not see my earlier post?
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#10 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 12 bolt car vs. truck
Here is a link to a page with some more info on identifying a car 12 bolt from a truck 12 bolt.
http://www.drivetrainshop.com/GM_12_Bolt_s/105.htm
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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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#11 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: 12 bolt car vs. truck
I sold the rearend from my 68 to a guy with a chevelle who was tickled to get it? lol idk
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#12 |
Registered User
Join Date: Oct 2006
Location: bridgecreek ok.
Posts: 1,214
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Re: 12 bolt car vs. truck
I'm running a truck 12 bolt with moser 33 spline axles c-clip eliminators and a car 12 bolt billet yoke and a full spool with welded axle tubes.. Works great so far.
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#13 | |
Registered User
Join Date: Aug 2010
Location: Springfield, Oregon
Posts: 164
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Re: 12 bolt car vs. truck
Quote:
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-1969 C/10 Short Step soon to be Brand NEW Ls6/T56 ![]() -03 Mazda Protege 5 -WTB 1970 Chevelle project |
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#14 |
Registered User
![]() Join Date: May 2005
Location: Tallahassee Fl
Posts: 773
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Re: 12 bolt car vs. truck
Raced a Narrowed 12 bolt with factory posi for years, twisted an axle once, but that was about it. 3500# car 14x32 slicks running 10's It's all in setting them up properly.
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#15 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: 12 bolt car vs. truck
Like mentioned earlier... the "weak" link in a truck 12-bolt is the smaller pinion diameter as compared to the car 12-bolt. But I have seen a lot of cats with trucks with truck 12-bolts putting some serious punishment to them, and they hold up fine.
Gary
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#16 |
Registered User
Join Date: Aug 2010
Location: Springfield, Oregon
Posts: 164
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Re: 12 bolt car vs. truck
Thank you guys just one last question and I know it's kind of broad but any idea what someone would charge to install the new posi axels exit if I bought parts....just strictly labor I have read the sticky and I might do it myself but just checking
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-1969 C/10 Short Step soon to be Brand NEW Ls6/T56 ![]() -03 Mazda Protege 5 -WTB 1970 Chevelle project |
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