CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
April 25, 2015, 01:36:20 AM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
112260 Posts in 12899 Topics by 4935 Members
Latest Member: rspallina
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  General Discussion
| | |-+  12 bolt width/8.5 10 bolt posi questions
« previous next »
Pages: [1] Print
Author Topic: 12 bolt width/8.5 10 bolt posi questions  (Read 2489 times)
Hero Member
Posts: 889

69 X33D80 Z28

View Profile
« on: March 23, 2008, 06:01:37 PM »

How wide is the Camaro 12 bolt backing plate to backing plate? I measured mine at approximately 53". Is this correct?

Also, I have a 8.5 10 bolt posi that measures approximately 56" backing plate to backing plate. Could this be for Chevelle possibly? Or 70's Camaro? I have this coil spring 8.5 10 bolt with a traction lock posi (based on info I received from BIGGEARHEAD last year) that I have no idea what it belongs to. Been surfing the web since 3 AM this morning trying to find info on it, but kept coming up facing a stone wall. I can't tell if it's a dated 69 unit or a 79 unit. Posi unit works fine. Based on the date of the differential H 15 9 and the carrier 410409 N dated H 2 9 and the ring gear part # 1 GM 1252065 17 41 dated 9 79 I can't tell if I'm coming or going. The passenger side tube has what may be a 7 but only has the bottom leg then KA   G267  1. I sure could use some help on this. I plan on just selling the posi unit but if the housing is a good needed housing I would rather see it go to someone that needs it.



'UNRESTORED' 1969 Cortez Silver X33D80 Z28
Hero Member
Posts: 5070

View Profile
« Reply #1 on: March 23, 2008, 06:17:49 PM »

How wide is the Camaro 12 bolt backing plate to backing plate? I measured mine at approximately 53". Is this correct?

Yes, that is approximately the measurement on my car.


Hero Member
Posts: 520

almost finished

View Profile Email
« Reply #2 on: March 23, 2008, 10:48:34 PM »

The '69 10-bolts were 8.2" ring gear, so you have a '73-up rear. If I remember right, after '72 the 12-bolt was gone and all the axles were 8.5" after that. It couldn't be for a '70s Camaro--they were all leaf spring cars. My 2 cents and good luck!

HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.071 seconds with 17 queries.