okay im pretty sure i have a 8.5 10 bolt non posi and im trying to change it to a posi unit with 373 gears or should i go with 308's. i have a 1967 camaro and im going to build a 383 motor pushing maybee somewhere around 400+ Horses. first of all i want to get this rear end worked on. then take the 305 currently in but i want to test the engine after i change the rear. but im still not sure if it is a 8.5 or a 8.2 i've searched for this post and i found that the 8.5 has the square lugs on the lower part of the rear end and that what i have and the 8.2 is just a circle. well i want to know what kind of posi units should i get
let me know what you guys think
thanks again
louis

Check out this link. This will help.

http://www.novaresource.org/axle.htm

I would recommend an Eaton Carrier because they are rebuildable. I would also go with 3.08s because with 400 plus horsepower, the car is going to take off fast. When you hit highway speed, your RPMs will be low.

how do i know if its a 28 spline or 30 spline

pull an axle to be sure but, i believe the novas all came with 28 spline axles, trucks had 30 spline
you can change if you want, 30 spline would be stronger

well im still unsure on what i have there because the pictures that shows from that website that camaros n chevelle shows i have a 10 bolt 8.5 but when i question these people that sell the posi units says its a 8.2

my car is a 1967 camaro that had a powerglide

what i have and the 8.2 is just a circle.


If you do not have the lugs on the bottom it is an 8.2 with 28 spline axles.

http://cgi.ebay.com/ebaymotors/10-Bolt-8-2-Eaton-Posi-Gear-Bearing-Kit-Camaro-Nova-SBC_W0QQitemZ120272527185QQihZ002QQcategoryZ33731Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

I bought mine from this guy good price and service.

okay i just checked again and now i knoe i got a 8.2.
i want to know if i should change my rear end if im going 400+hp and to what
will it be okay to run this 8.2

By saying 400+, does that mean you are staying around 400 HP ? The 8.2 should hold up fine to that. If you are looking at 500 HP, it would be wise to change it.

okay good im stay with this 8.2 im trying hit 400-420hp and you guys say that it should up but gear ration 3.08 or 3.73 what will the 3.73 do i have a 4 speed muncie in it m20

Your car has probably has the stock 8.2" ten bolt under it now, so changing it out for the one you bought wouldn't do much good.

You have more options that 3.08 and 3.73. The higher numerically you go the faster your engine will spin when cruising on the freeway.
With 3.73 gears at 60 mph you're spinning about 3000 rpm
With 3.55 at 60 you're spinning about 2800 rpm
With 3.08 at 60 you're at 2500 rpm

However, your car will be quicker off the line with numerically higher gears...

It is a trade off, with out an overdrive it is a balancing act.

are these easy to change to posi or is it more to it?

I would almost bet that you could find a 8.5 rear to go in the car that is already set up and ready to go for about what you are going to put into the 8.2. My brother in law just bought one with 3.73 gears/posi/all new bearings and ready to go for $800. To change his removed 8.2 unit to posi and make the gear change would have cost that much in parts and we can do the work ourselves. As for changing the rear from non-posi to posi and making a gear change it is not just a matter of buying the parts and sticking them in. You have to ensure that the unit is properly shimmed and that the pattern on the gear is proper, etc. If you have not done one before you would probably need to get some assistance at the least and again I would bet that you could find a ready to go 8.5 set up to your specs if you take a bit to look. Then if you go with more power down the road you are still using a rear that can handle it. Just my thoughts.

I bought an 8.5, and a used posi unit and had it set up for less than I could have put a posi into the 8.2. Parts for the 8.2 are kind of pricey since there aren't many left.

will 10 bolt 8.5 from 1970 camaro bolt right up on a 67 camaro

okay i found this site http://www.chevyhiperformance.com/techarticles/48518_posi_10_bolt_upgrade_install/index.html
it tells me a lot
i was wondering cause i got confused on how it says that the novas from 72 and 75 will bolt right up also leaf spring
but the 71-81 camaro/firebird will employ a wider leaf mount cause its 1' wider so if i change the axle from my 8.2 will the mount line up or i need to fabricate can someone elaverate what this article is trying to say cause im a little confuse i know its saying it interchangeable but is it only the axles what makes the 8.2 and 8.5 different in bolting up in the 67-69 camaros????

im going to find a 8.5 with posi unit from a camaro for under 200 and go with that, thats the plan instead of buying the kit and spending 700 bucks on an 8.2 that once its abused it'll break you know what i mean ending up to be just a waste right
thanks again
louis

8.2" with a good Eaton posi will last a long time if driven with common sense. Mines beat on at the track and still good to go..... for now :D.

12 bolt awaiting gears (ordered finally)

I got one from a 70 Nova. It bolted right up. Nova's are easy to find, even a 4 door will have an 8.5, and it will be cheap.

8.5" 10 bolt didn't start in Nova's until '72

I think this answers a question you asked.

A rear end from a second gen Camaros (71 through 80 something) will not bolt in, the leaf spring mounts are further apart and the whole rear end is wider.
That means that you would have to cut the leaf spring perches off the axle and weld new ones on in the correct location.On top of that your current rims might cause some rubbing with the extra width of the 2nd get axle.

So, you want a rear end from a 72-75 Nova I believe.

I found a guy with a 8.2 10 bolt posi with 3.73 for $400 out of a 68 nova it only has 100 miles on it was bulit by a professional and the guy is 67 years old he didn't like the setup because it was too fast for him and he changed his rear to a 8.5 10 bolt 3.08 so my question is should get this its pretty much new and the whole rearend instead of building my 8.2 for almost $700
oh yeah will the 68 novas fit right in with the 67 camaro

thanks again
louis

I have the 8.2 in my 68 Camaro with 3.73, posi and never had problems yet. It is supposed to be close to 400 hp. It takes off fast but the cruise speeds like gas. The only planned change is a new cover with the preload bolts. From what I have read it should be fine running street tires. I do like the 3.73's for around town but may end up adding a TKO 600 in the future.

I believe ill be satisfied with the 3.73 because I'm looking for take off power and on top of that my question is that the unit came off of a 1968 nova so will that bolt right in
thanks louis

FOr $400 you probably can't go wrong if the unit is good and the gear is what you can use. Any Gen 1 Camaro rear will fit so yes a 68 would go right into a 67. The good thing too is that using the 8.2 you won't have to do anything with your driveshaft. It will fit right back in there.

I think I'm confusing you guys the whole rear end drum to drum from a 1968 Nova will that bolt right in to a 1967 camaro
thanks louis

i just found a guy selling a 10 bolt non posi 8.5 drum to drum on craigslist and im thinking about picking it up it came off of a 1972 nova and what i been reseraching is that the 8.5 is almost as strong as the 12 bolt and these novas will bolt right up with the 67 camaro instead of just sticking and getting another 8.2 im going to go ahead and get this one but what can i use from my old 8.2 the axels ?? do i have to get the driveshaft shorten what else do i need to do
wel on the cheveryperformance magazine it says that the 8.2 axels are interchangable to the 8.5 is that right?

thanks again louis

Well, if the 8.5" is complete drum to drum, why reuse anything.

But my guess is that the brakes would bolt up, the axles maybe, and the diff cover would also bolt on.

okay i just bought a 10 bolt 8.5 non posi off a 72 nova for $90 i think its a steal what do you guys think

now im still not sure what posi unit to go with eaton seems good and rebuildable should it be a 28 spline or 30 spline so i wont ebay the wrong thing.
i also found a guy that was trying to sell a 3.42 ring and pinion [$50] will that be good for a 4 speed muncie??? im going to be building a 383 stroker between 400hp and 450hp i just dont want to be whinning on the freeway. oh yeah does it also matter if if the ring and pinion set be 30 spline for the 10 bolt 8.5
its going in my 67 camaro
thanmks again
louis

sorry if this thread got too long i just really want to get thing right the first time you know its hard to wrench on these cars twice haha

Will a 76 Nova rear bolt right in to my 69 Camaro. I believe it should be a 8.5 too?

okay i just bought a 10 bolt 8.5 non posi off a 72 nova for $90 i think its a steal what do you guys think

now im still not sure what posi unit to go with eaton seems good and rebuildable should it be a 28 spline or 30 spline so i wont ebay the wrong thing.
i also found a guy that was trying to sell a 3.42 ring and pinion [$50] will that be good for a 4 speed muncie??? im going to be building a 383 stroker between 400hp and 450hp i just dont want to be whinning on the freeway. oh yeah does it also matter if if the ring and pinion set be 30 spline for the 10 bolt 8.5
its going in my 67 camaro
thanmks again
louis

sorry if this thread got too long i just really want to get thing right the first time you know its hard to wrench on these cars twice haha

Dang, your lucky, good find. At $90 you really did steal that thing! I paid almost double that for mine.

The stock axles are 28 spline in a car 8.5", 30 spline in a truck 8.5" (your axle is from a nova so should be 28)
You can choose to go with either, but if you want to go with 30 spine you have to get new axles and some specific bearings (so I was told, I haven't finished or started the install)
If you want you can keep the stock 28 spline axles and get a 28 spline posi (or swap out the axles later)

When looking for gears is should not matter if you go with 28 or 30 spline axles.

To figure out what ratio to go with try some different combos on a calculator like this one:
http://www.wallaceracing.com/calcmph.php

With 3.42:1 you will be at about 2900 rpm at 65 mph