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1968 CAMARO REAR END 10 BOLT

 
JOHNCAM1
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Posts: 1
Joined: 06/09
Posted: 06/22/09 05:40 PM

I HAVE A 1968 CAMARO THAT IM WORKING ON AND I NEED TO KNOW THE REAR END THATS IN IT
THE NUMBER ON THE LEFT PASSENGER SIDE TUBE IS PA0115G1 IS IT AN 8.2 OR 8.5 AND WHAT RATIO AND A LARGE RING OR SMALL N POSI OR P POSI PLEASE HELP.
                                                      THANKS  

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zman123
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Posted: 06/24/09 08:45 AM

If you take the cover off and count the teeth on the ring and pinion gears then divide number of teeth on the ring by the number on the pinion you will get the ratio. If the carrier is a posi it will have springs in it you can see, open diffs don't  

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69camaro1
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Posted: 07/05/09 08:53 AM

It's a 8.2.The ring gear size only changes from gear ratio to gear ratio. The ring gear size doesn't change from posi to non posi. You can check for a posi without opening the cover. By spinning the wheels/axles both will go the same direction with a posi; oppisate for non posi. If you have a posi you can detrmine the gear ratio by the number of turns of the axle in relation to the pinion yoke. Without a posi you have to go by the dividing method with the cover off. If you don't have a posi try looking in ebay for an original eaton posi, which can be had for around $200-275 compared to new aftermarket eaton about $500.  

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homebuilt
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Posted: 12/30/10 05:06 AM

I have a 68rs with the origanal 10 bolt rearend I was wondering what kind of horse power these rearends can handle. I am running a 350 with around 325 housepower but plane to go bigger in the future. Would appreciate any input on this subject.Homebuilt68rs.  

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tuffnuff
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Posted: 12/30/10 05:33 AM

Icon Quotehomebuilt:
I have a 68rs with the origanal 10 bolt rearend I was wondering what kind of horse power these rearends can handle. I am running a 350 with around 325 housepower but plane to go bigger in the future. Would appreciate any input on this subject.Homebuilt68rs.

Depends on what 10 bolt you have,,,
this 8.5" one

10Bolt85inch

or this 7.5" one

10Bolt75inch

check it out and post which of the two you have,,,

Grin  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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Dave632
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Posted: 12/30/10 03:36 PM

I think the original rears in the early Camaros were the 8.2 version, I think that's what my 67 had in it. After 43 years my memory may be fading however.  
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homebuilt
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Posted: 12/31/10 04:34 PM

by looking at both rear ends I would have to say its the 7.5 But being a rally sport I woud think it woud be the 8.5.  here are some numbers maybe it will help. pa0102g2  970 gm on shaft.  62-L157 other numbers I have are 3894859nf. Thank you for any info you may have. Happy New Year.  

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Dave632
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Posted: 12/31/10 08:26 PM

My last 68 Camaro had a Dana 60 in it which has a 9.75" ring gear. If you want one that is hard to break try one of those. I could not break it with a 632 and some nitrous.  
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tuffnuff
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Posted: 12/31/10 08:49 PM

Icon Quotehomebuilt:
by looking at both rear ends I would have to say its the 7.5 But being a rally sport I woud think it woud be the 8.5.  here are some numbers maybe it will help. pa0102g2  970 gm on shaft.  62-L157 other numbers I have are 3894859nf. Thank you for any info you may have. Happy New Year.



The 8.5" would have the bulge in the cover, to clear the larger crown gear.
If your diff has the 2 claws at the bottom and no bulge, it's a 7.5"

Grin  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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homebuilt
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Posted: 01/01/11 05:53 AM

Thank you for that info very much appreciate. mine does have the bulge. so I belive you are corret it is a 8.5 witch I am glad to know. thanks again.  

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homebuilt
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Posted: 01/02/11 11:59 AM

I just found some numbers I had written douwn when I changed the fluid in the rear end of the 68rs camaro. I thought maybe someone could identify them. The gear inside the rear end reads  2gm 3790629  12  37. Just curious Tanks.  

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tuffnuff
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Posted: 01/02/11 12:08 PM

That 12 37 means you have a 3.08 ratio

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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homebuilt
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Posted: 01/04/11 06:22 AM

If this rear end is a 8.5 would puting in a Powertrax lock-Right locking differential from Richmond bought through Summit Racing plus adding Strange c-clip eliminators be a suitable setup for the 350 engine with say 325 horse power. For having fun fiday night gruge night at new england dragway? Thank you for any opinions on this set up.  

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chevelle83
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Posted: 01/04/11 09:35 PM

Yes that 8.5 will be just fine with 325-375 hp,,, I think the C-clip eliminators will be over kill.  

Adding a posi unit is a great idea and is much stronger than your factory carrier.    If you are using an automatic trans at the strip that makes it even easier on the rear end.  

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Dave632
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Posted: 01/05/11 11:46 AM

Some tracks will require a c clip eliminator on cars with slicks.
Some tracks will let you run anything as long as you pay the entry fee.
I would check with the local track rules. I have to agree that c clip eliminators are not needed on your setup but the track rules are the main factor here.
A locking diff would definitely be a plus for drag racing.  
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