10 bolt rears, 8.2" vs 8.5"...what's the difference? - Team Camaro Tech
Team Camaro Tech join team camaro
 
Camaro Parts at SS396.com     
GROUND UP & SS396.com         
Official Sponsor of Team Camaro
   

Auto Insurance



Registered users (free) do not see these large ads

Brakes, Suspension & Steering Conversion questions, Steering & Handling

Reply
 
Thread Tools Display Modes
  #1  
Old May 20th, 05, 11:07 AM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default 10 bolt rears, 8.2" vs 8.5"...what's the difference?

How can I tell the difference between these 2 (other than ring gear diameter)? Or do they use the same housing? What are the part code differences?

Thanks
Buddy P
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old May 20th, 05, 11:23 AM
pdq67 pdq67 is offline
Banned

 
Join Date: Apr 2000
Location: Columbia, MO USA
Posts: 21,341
Smile Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

An 8.2 has a 10 bolt cover on it that looks like a 12 bolt's "12 bolt" type cover whereas, I think the 8.5" rearend has tw lugs that hang off the lower right and left sides of the bottom of the center casting so that you can tell them apart quite easily if not mistaken from the lower back of the cars....

pdq67
Reply With Quote Quick reply to this message
  #3  
Old May 20th, 05, 02:38 PM
DOUG G DOUG G is online now
Moderator

 
Join Date: Mar 1999
Location: Harford Co, Maryland. USA
Posts: 15,352
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

http://www.novaresource.org/axle.htm
This has a picture of what they look like and some of the differences.
__________________
68 Camaro~LSx
Best to Date....
1.546 60'
7.132 @ 94.43 660'
11.327 @ 116.79.
*NEW: Custom built 5000 stall just added....un-tested, yet
RedЯum <-Pics
http://www.youtube.com/watch?v=Of8WV...ature=youtu.be <~More here
Reply With Quote Quick reply to this message
  #4  
Old May 20th, 05, 04:41 PM
boodlefoof boodlefoof is offline
Senior Tech

John
 
Join Date: Feb 2001
Location: Maine
Posts: 3,095
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

If I remember correctly, the 8.5'' unit also uses a higher spline count on the axles which contributes to making them a bit stronger.
__________________
John

- '68 Chevy Camaro (sort of done, but always subject to improvement)
- '63 Pontiac Tempest (work in progress)
- '72 Datsun 240-Z (back-burner for now)
Reply With Quote Quick reply to this message
  #5  
Old May 20th, 05, 05:53 PM
HwyStarJoe's Avatar
HwyStarJoe HwyStarJoe is offline
Moderator

 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,343
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

The 8.2 10-bolt has a 1 1/8" pinion nut and 3/8" ring gear bolts with 9/16" heads.

The 8.5 10-bolt has a 1 1/4" pinion nut and 7/16" ring gear bolts with 3/4" heads and left hand threads.
__________________
*---------------------------------*

STREET MACHINES OF ROCHESTER

SEMA ACTION NETWORK

UNITED SERVICES ORGANIZATION (USO)
Reply With Quote Quick reply to this message
  #6  
Old May 21st, 05, 07:42 PM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

So if I were to get a Posi differential for a 10 bolt, do I want the 8.5 housing or doesn't it matter? Kinda limited on knowledge on rear ends. A full differential housing replaces the ring and pinion gears right?
Reply With Quote Quick reply to this message
  #7  
Old May 22nd, 05, 05:19 AM
HwyStarJoe's Avatar
HwyStarJoe HwyStarJoe is offline
Moderator

 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,343
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

The carriers are different between the 8.2 and the 8.5 rears. You can't use an 8.2 carrier inside an 8.5 rear end, and vice versa.
__________________
*---------------------------------*

STREET MACHINES OF ROCHESTER

SEMA ACTION NETWORK

UNITED SERVICES ORGANIZATION (USO)
Reply With Quote Quick reply to this message
  #8  
Old May 22nd, 05, 02:01 PM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

Are the leaf spring perches something you can buy to weld on? Have a chance to get a 8.5 10 bolt but the leaf spring perches have been cut off.
Reply With Quote Quick reply to this message
  #9  
Old May 22nd, 05, 07:05 PM
WildBillyT WildBillyT is offline
Senior Tech

Bill
 
Join Date: Apr 2004
Location: Raritan NJ
Posts: 1,323
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

Moser makes a nice set for around $70.
Reply With Quote Quick reply to this message
  #10  
Old May 23rd, 05, 03:22 AM
novaderrik novaderrik is offline
Senior Tech

 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,296
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

i got a set of "Mopar" spring perches from a circle track supplier for $15 when i put the 8.5 in place of the 8.2 in my nova. i only needed them because the housing was setup for multi leaf and my car had mono leafs at the time.
i re-used the 8.2 axles, brakes, and rear cover and put a posi from a 79 Z/28 with Richmond 3.70 gears (bought both together for $100) in a housing i bought out of a 74 Nova in the boneyard for $50. another $40 to get the perches welded on and $50 to have my cousin's friend set it all up. another $15 in Amsoil series 2000 gear oil and i was set.
but i got off really cheap, and it worked pretty well for 4 years until i traded the car off last fall.
__________________
you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
Reply With Quote Quick reply to this message
  #11  
Old May 23rd, 05, 06:25 AM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

What do you mean "until" you traded the car off? What kind of power were you putting out with your car? A buddy of mine can get a locking differential for nothing.

Are these holding power pretty decent? 500hp range? Should I just focus on a 12 bolt? Just had a lead on a 8.5 10 bolt is all.

Also, I've heard that the 8.5's out of the Nova's will bolt right up to the 1st gen camaro's, is this true?
Reply With Quote Quick reply to this message
  #12  
Old May 23rd, 05, 07:06 AM
HwyStarJoe's Avatar
HwyStarJoe HwyStarJoe is offline
Moderator

 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,343
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

8.5's out of Nova/Apollo/Omega bolt right in. They're the same dimensions as the First Gen rear ends. No fabrication required at all.

If you're throwing 500hp at the rear wheels, I'd go with a rebuilt 12-bolt. But everything I hear says an 8.5 that's rebuilt properly with higher spline axles like Mosers and a quality carrier and gears is still less expensive and just as strong as a 12-bolt.
If you already have the 8.5, go for it.
__________________
*---------------------------------*

STREET MACHINES OF ROCHESTER

SEMA ACTION NETWORK

UNITED SERVICES ORGANIZATION (USO)
Reply With Quote Quick reply to this message
  #13  
Old May 23rd, 05, 08:23 AM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

I don't have an 8.5 currently but I would be putting in a good set of 30 spline axles
Reply With Quote Quick reply to this message
  #14  
Old May 23rd, 05, 09:30 AM
camaroman7d camaroman7d is offline
Senior Tech

Royce
 
Join Date: Apr 2001
Location: Vacaville, CA
Posts: 10,406
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

The 8.5" rear end can be built very strong. If you want to run 30 spline axles you will of course need a carrier that has 30 splines as well. Stock is 28 spline. If you get 28 spline aftermarket axles they will be much stronger than stock. The ring gear is larger on the 8.5 vs. the 8.2.

I built my 8.5" with Moser axles (28 spline), ARP cap studs, c-clip eliminators, locker, and aluminum support cover. Ran in the 11's for years and never hurt it. Built a blown small block didn't change the rear end and still never hurt it. It is still in the car and the guy I sold it to put in a blown engine as well. My point it they will take a lot of abuse if built right. Even in stock form they are pretty darn strong. If you are going to run slicks and a trans brake you might want larger axles. If not I doubt you would hurt the 28 spline axles. You didn't say how much power or how fast you are trying to go so it's hard to make suggestions.
__________________
Royce (NO XQSSS) Bradley
www.facebook.com/driveyourjunk
http://www.youtube.com/watch?v=DSLsGgDjFXE
(brief sound/video clip, 3 1/2" exhaust through Borla Sportsman mufflers)
Reply With Quote Quick reply to this message
  #15  
Old May 23rd, 05, 10:40 AM
BuddyP BuddyP is offline
Tech Team

 
Join Date: Aug 2004
Posts: 96
Default Re: 10 bolt rears, 8.2" vs 8.5"...what's the difference?

Yes I would be getting a 30 spline carrier and would get HD 30 spline axles. I am building more of a Pro Touring car so would not have slicks or be making hard launches, and will probably not have more than 500hp.

Are the 30 spline axles between the 10 bolt and 12 bolt the same? (interchangable?)
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply
Team Camaro Tech > First Generation Camaro Info and Tech - 1967- 1969 "Where it all started" > Brakes, Suspension & Steering      Current Topic: 10 bolt rears, 8.2" vs 8.5"...what's the difference?
Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Trunk Lid Fit Problem RPOL72 Body Shop 8 Aug 27th, 03 02:45 AM
Hood adjustments!! Handy69Z Body Shop 2 Mar 13th, 03 05:14 AM
Hanging Doors ? wesley58_do Body Shop 6 Jan 30th, 02 12:23 PM
What is the difference between a 12 bolt and 10 bolt rear? 69musclecar Tech 2000 9 Feb 7th, 01 07:46 PM
12 bolt question....which rears interchanges car to car johnm Tech 2000 3 May 2nd, 00 02:23 AM


All times are GMT -7. The time now is 07:48 PM.



Camaros.net - 2009 AutoForums.com