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Username Post: rear end        (Topic#342802)
oldgreen57 
"7th Year" Silver Supporting Member
Posts: 115
oldgreen57
Loc: North Mississippi
Reg: 12-16-09
02-21-17 08:01 AM - Post#2677797    

I want to change my rear end in my 70 Camaro to a 3.55 posi. I have a 8.2 now with a 2.73 peg leg can someone give me some pointers?

1957 210 & 1960 Corvette


 




Shepherd 
Contributor
Posts: 852

Loc: Lake George, NY
Reg: 11-11-15
02-21-17 08:42 AM - Post#2677805    
    In response to oldgreen57

Not cheap, but you can probably buy that complete 3rd member, ready to go. Unless you have experience setting up a rear and the proper tools, this may be the way to go.



 
models916 
Valued Contributor
Posts: 4579

Age: 66
Loc: Addison, IL
Reg: 05-28-10
02-22-17 09:00 AM - Post#2677983    
    In response to oldgreen57

Last of the 8.2 in the camaro

http://www.nastyz28.com/2gcog/rearaxle.html



 
raycow 
Honored Member
Posts: 26475
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-22-17 01:45 PM - Post#2678041    
    In response to Shepherd

  • Shepherd Said:
Not cheap, but you can probably buy that complete 3rd member, ready to go. Unless you have experience setting up a rear and the proper tools, this may be the way to go.


That would definitely be the best way to go if a 70 Camaro rear end actually HAD a 3rd member, but it's a Salisbury type rear, so it doesn't.

However, your basic idea is still a good one. So look for a complete 2nd gen rear end with the gears you want and swap it. This will likely cost a lot less than buying new gears and paying a shop to set them up in your present rear. The rear end swap is just grunt work and almost anyone can do it. IMO, the only finicky part of the entire swap is bleeding the brakes.

Btw, while you are looking, don't pass up any 75-79 Nova (or BOP clone) rears. These can sometimes cost less than one from a Camaro or Firebird because the seller may not know that it fits. This can work against you though, because some sellers are just parts flippers and have no clue at all what they are selling. To be on the safe side, don't buy one that you can't personally inspect and measure. You want to see about 45-3/8" between the spring pad centers.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
Shepherd 
Contributor
Posts: 852

Loc: Lake George, NY
Reg: 11-11-15
02-22-17 05:43 PM - Post#2678069    
    In response to raycow

Good catch ray, result of too many Mopars and Ford 9's. Lol



 
Old Chevy Soldier 
"6th Year" Gold Supporting Member
Posts: 247
Old Chevy Soldier
Loc: Central Montana
Reg: 03-12-12
02-24-17 09:39 AM - Post#2678352    
    In response to raycow

Ray, I am completely ignorant on the subject of rear ends (on cars). What is the difference between rear end, differential, third member, Salisbury, etc.?

Life is to short to ride an ugly horse or drive a Ford


Edited by Old Chevy Soldier on 02-24-17 09:40 AM. Reason for edit: No reason given.

 
raycow 
Honored Member
Posts: 26475
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-24-17 08:17 PM - Post#2678434    
    In response to Old Chevy Soldier

  • Old Chevy Soldier Said:
.....What is the difference between rear end, differential, third member, Salisbury, etc.?


Ok, I'll try to keep it simple.

Rear end is just car slang for the complete rear axle assembly, which includes the housing and its internal parts. Among those internal parts is the differential, which is a gearing arrangement that allows one wheel to turn faster than the other when the car is going around a corner.

A disadvantage of the basic differential design is that if one wheel loses traction and spins, the other wheel doesn't get any driving torque. This type is called an open differential. Solutions for the traction problem include limited slip and locking differentials, which use a clutch or ratchet mechanism to insure that the wheel with the best traction always gets at least some driving torque. A "posi" (short for Positraction) is Chevrolet's brand name for one type of limited slip differential.

If the differential is mounted in a removable casting at the center of the axle housing, that removable assembly is called a third member. It can also have a bunch of slang names like pumpkin and chunk.

A Salisbury type axle housing is constructed by welding steel tubes into a cast center section. Access to internal parts is via a removable cover plate on the rear of the housing. Many modern RWD cars and light trucks use this design because it usually weighs less and costs less than a third member type rear of equivalent strength. One major downside is that it doesn't allow fast gear ratio changes like a removable third member does.

I think I've covered all the terms you asked about and I hope their meanings might be clearer to you now. If you need additional info, feel free to ask.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
Old Chevy Soldier 
"6th Year" Gold Supporting Member
Posts: 247
Old Chevy Soldier
Loc: Central Montana
Reg: 03-12-12
02-25-17 10:10 AM - Post#2678487    
    In response to raycow

Ray,
Thank you very much! I've been dinking around with cars since I was 14 years old but have only R&Rd rear ends. Your explanation was excellent. I've heard rear ends as described by you, referred to as differentials and third members. It's been my experience that these terms aren't always used correctly which leads to confusion for people like me. An automotive related dictionary with synonyms would be helpful. Thanks again, Tim

Life is to short to ride an ugly horse or drive a Ford


 
raycow 
Honored Member
Posts: 26475
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-25-17 11:32 AM - Post#2678495    
    In response to Old Chevy Soldier

Tim, you are very welcome. If I was able to help any, I'm glad. I also agree with you that a dictionary of automotive terms and their synonyms would be extremely helpful. Oddly enough, there are "translation" lists of US and British automotive terms (like hood = bonnet) on the net, but I haven't been able to find a more general dictionary such as you were wishing for.

Anyway, I missed one term you didn't ask about, but which I intended to include and forgot. If you read the OP's post, he mentions a "peg leg". That's a slang term for an open differential. In other words, one without posi.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 




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