rear axle id/ need help figuring what gears to buy

hi everyone, trying to id what rear axle i have, looked this up on the internet, but makes no sense- the rear that is in the car has axles that are retained by the wheel bearings, ring gear bolts are 11/16" socket rh threads, car is a '68 gto, but i'm not sure if rear is original, car has 3.23 gears currently, ring seems to measure 8.2". apparently i can have 2 different 10 bolts that are 8.2", one is corporate and one is bop and the gears are different between the 2. here is a link   http://www.crankshaftcoalition.com/wiki/Rearend_identification  

Check out this other thread, dealling with the same issue and lots of good info:
http://http://forums.highperformancepontiac.com/70/9375373/drivetrain-upgrade/wishing-to-change-10-bolt-69-pontiac-gto-rearend-g/  
A little help... 'cause we don't all have to learn the hard way!

Looks like you have the BOP 8.2", same as my 1970 Tempest.
Steve  
A little help... 'cause we don't all have to learn the hard way!

link didn't work!! incidentally, i'd like to put 3.73 gears in it, am i wasting my time and should find a 10 bolt out of a chevelle? this rear has a brand new powertrax unit in it. i guess a better way to put it, is this a good rear axle from a performance standpoint? car is a stick, i'll probably run drag radials and i'm wondering if this is a good way for me to go. i know alot of people have run fast w/ the gm 10 bolt 8.5", and i'm curious if this rear is as good.  

I'm going to find out the hard way I guess, i just invested in a new Auburn posi and Yukon 3.55 gears for mine!
Steve  
A little help... 'cause we don't all have to learn the hard way!

+1 Steve.
That looks like the BOP 8.2"..
From a performance standpoint, I'd look for an 8.5" or even a 12 bolt.  
Jim,

actmobmar:
link didn't work!! incidentally, i'd like to put 3.73 gears in it, am i wasting my time and should find a 10 bolt out of a chevelle? this rear has a brand new powertrax unit in it. i guess a better way to put it, is this a good rear axle from a performance standpoint? car is a stick, i'll probably run drag radials and i'm wondering if this is a good way for me to go. i know alot of people have run fast w/ the gm 10 bolt 8.5", and i'm curious if this rear is as good.

I fixed the link, so now it works.,. The 8.5 is only 3/8" smaller than the 12 bolt.
I'd go with the 8.5, if it's available to you.

 
When The Flag Drops,,,



The Bull Chit Stops,,,


P. Engineer, Engine Builder

i'd have to find one, but it seems like there out there. its a shame because this already has a powertrax in it, along w/ new brakes  

Just my 2 cents, but I would buy the 3:73 gears and put them in with the good stuff you already have and drive the (fire) out of it! Unless you're pushing 600 hp out the back door, I wouldn't worry about it. You will probably have years of enjoyment out of it with no problems. Drive it 'till it dies, then find an 8.5!  

I just read that there are different carriers the car had 3.23 gears do i also have to change the carrier to go to 3.73?  

Yes! The carrier changes when you go from 3.23 to 3.36.  
A little help... 'cause we don't all have to learn the hard way!

i ended up buying a 12 bolt out of a chevelle, 2.73 posi, so i'll have to do a gear change, if memory serves correct they make a 3.73 gearset to go on the 2 series carrier