I really dont know alot about what goes into rebuilding rear ends,so I plan on having someone do it for me, but I would like to be sure I buy the correct parts that I need to install a posi. I have a 91 camaro rs with 5.0 v8 and I was told that I have a 10-bolt with 7.625 open 2:73 ratio. From what I read in the FAQ section about 10-bolts my car comes stock with 28 spline axels, I know I need to buy a posi carrier and I have read that the Eaton posi is the one I should use also that I need a set of bearings and shims as well as a new diff cover for extra strgenth. I also don't know what gear ratio I should upgrade to, like I said before I really dont know that much about this type of upgrade. My maine concern is if my information is correct, am I forgeting something and what gears should I use. If anyone has done this upgrade before I would love to have a list of what parts you used as well as what you did. Thanks for your help and patience with this newbie to the thirdgen world..lol.

 

i went from 2.73 to 3.23 in mine, i like em, its a good combo of low end and cruisabilty

the eaton is good if you can afford it,

i put all new seals and bearings in mine, new brake line, 100% new brakes and a used low mile set of 3.23

i was going eaton, but they where on back order everywhere it seemed. i went with the pro serries from auburn, its better than the regular auburn, the 5 year pro rated warrenty and all i said the hack with it, if it last 5 years thats good enough for me.... if it dont i will swap it out on the pro rated thing, and sell the one they send my back and get an eaton

 

Did this a couple years ago.
Put in 3.73s with Auburn posi.
While I was replacing things...
I went to 30 spline axles (not necessary unless you have some big HP plans later on)
I also added the Rearend girdle you mentioned.
Definitely woke the car up.
Absolutely a good upgrade. Higher # gears are great if you want a lot of pep, but don't make a lot of long trips. (Drinks gas a bit on the highway)
If you drive a lot on the highway, 3.23s would be a better choice.
Good luck with your upgrade.

 

Randy's Ring & Pinion has a posi unit by Yukon that I'm running now. It's a great unit and much smoother than the locker I was running. 3.73s are the gold standard for a street gear. Going up a full point of gear like that will give you bang for buck close to nitrous. You could drop a full second off your 1/4 mile, which is like adding 100 HP.

Get a posi unit for 28 spline axels, a bearing kit, a shim kit, and a set of gears (get American made like the Yukon gears from Randy's, no cheapie import junk, it's worth the extra $40). I would suggest ditching the crush sleeve and going to a solid spacer too. If you do the rear end girdle get a set of studs for the caps too. I like TA Performance for these. Definiately look at your axels and pinion yoke too. If the seal surfaces are scored, and/or the car has high milage I would replace the axels and yoke. It sucks to spend time and money building a rear just to have an axel break, or a seal leak. Moser makes a good axel kit for these cars for about $250 I think. I'm running them and love them. A new yoke will set you back about $75, but again is well worth it to prevent a puddle on the floor. A rear built like that will be the strongest 7.625" 10 bolt you can have. It's not going to be a 9", 12 bolt, or Dana 60 no matter what you do, but it will live a long life on the street regardless of power, and should even do well with limted strip duty. I don't know if I'd run slicks on it, but sticky DOT tires should be fine.

 

You need the Eaton Posi, gear set and a good installation kit. The 3.42 is very popular along with the 3.73. The 3.42 would be better if you are on the highway a lot. A new Eaton is $435, gears are about $200 and the installation kit is between $90 and $100. Be sure to check the axles for wear. A new set of axles is around $200 and bearings and seals are $20.

 

Thanks guys for the info what place in your opinion would be the best to buy my parts. I use ebay a lot but if you know of any company that sells what I need at decient prices it would help alot.

 

Do you do realize that the gears need to be setup properly. You can't just bolt them in and expect it to work. It requires some special tools and the know how. Just thought I'd mention it in case you weren't aware.

 

I bought all my stuff from Moser. They were reasonably priced and have good quality products. Then I found a reputable mechanic locally to put the gears in for me and set it up.

 

yeah I know that it needs to be done right that is whay I plan on haveing a local drive train shop do it for me . Thanks for the help any ways.

 

Don't forget that your speedo is going to be off too.

 

Yeah does anyone know what I'll need to fix it to wear my speedo is what it should be.

 

You will have to change the speedo gear in your transmission. You will have to do a search on which gear you will need to get it accurate again.

 

do a search on here for speedo gear swap, just read them all, some have links that tell you exactly what you need, i got lucky on my swap and only had to change the cable gear, not the shaft gear also

i think on my post "2.73 to 3.23 speedo gear swap" has some good links on it