one wheel wonder has to go. I believe i either have 3:08 or 3:23 gears, more research this weekend should give a more definitive answer. From reviews on here the eaton posi seems like the way to go, but what else do you recommend? id definitely like larger gears, but for a stock 305 (headers, intake, 570 cfm holly carb) just not sure it be worth it. I also have the Pro built road racing rebuild kit installed on my 700r4, with a 2200 stal.

All work will be done by a shop, assuming i can find one like to keep this under a grand, but will see what you all throw out there.

 

Eaton posi center is the most common preference. There is auburn but they are not as preferred. If you could find it fairly cheap a 98+ LS Zexel-Torsen posi rear center should be another good choice. Hopefully you can find a place at a reasonable rate. I have heard others say about 200-250. I only found one place at 600 after I bought all parts.

 

Sounds like a good plan. While you have the rear out upgrade your 10 bolt to the same specs as a '90-'92 thirdgen 10bolt rear with the G92 option. Those came with 3.23 gears (L98 engine) or 3.42 gears (LB9 / 5-speed). Both set-ups had posi-traction, 28 spline axles and, the marginally larger 7.625 inch ring gear vs. the earlier 7.5 inch ring gear.

In terms of strength a '90-'92 10bolt thirdgen rear is equal to a fourthgen 10bolt rear. You could also add a differential girdle for a little added extra strength. At some point you could also upgrade to the '89-'92 11 inch brakes in rear along with the PBR calipers aswell. Doing that brake upgrade will also make your car have the same rear brake set up as the fourthgen 10bolt rears. Also remeber to get the right speedometer gears if you do end up changing the rear gear ratio as well. That way your speedometer will still be reading correctly for your new set up.

Upgrading your gears to 3.23 gears (if you don't already have them) or 3.42 gears would be my recommendation. They are a good compromise between good all around performance and fuel economy.

I've got a borg warner 9bolt rear with 2.77 gears and I am in the process of swapping them out for 3.27 gears. I've driven a couple of '91 Z28's that had the L98 and 3.23 gears and I liked that set up. I've also got a bowtie overdrives level 3 700r4 and 2400rpm stall. The gear change should really wake my car up. I am sure that swapping the gears in your car (especially if you have 3.08 gears) will really wake your car up as well.

The gear swap will be a welcome upgrade for your Z28. Performance for the early '82-'84 Z28's like yours was helped out a lot by the L69 engine option. Besides the increased power the L69 had over the LU5 and LG4 engines, they also had steeper rear gears from the factory. For '83 the L69 was only available with the 5-speed and 3.73 gears. For '84 you could still get the L69 with the 5-speed and 3.73 gears. The L69 also was available with the 700r4 for the first time.

The 1984 non-G92 gear ratio option 700r4 combination was: L69 engine / 700r4 / 3.42 gears.

The 1984 G92 gear ratio option 700r4 combination was: L69 engine / 700r4 / 3.73 gears.

 

its a 9 bolt well i think its a 9 bolt...

 

Thats not a bad thing. 9bolts are stronger than 10bolts. If it is a 9bolt just means that someone swapped the rear over the cars life. The parts a more expensive to get for 9bolts compared to 10bolts since GM used the 10bolt rear in so many vehicles.

GM made 3rd and 4th generation Camaros from 1982-2002. A good bit of the cars produced during that run were equipped with the 10bolt rear. Until you go beyond something that the 10bolt or 9bolt can hold, I would want to keep it. Both of those rear ends are lighter and take less power to turn compared to an aftermarket 9'' ford or 12 bolt rear.

10bolts are very easy to find and so are parts. I used the website below to get some parts for my rear. You can also look for cheap rear ends in the junk yards to. You could also sell the 9bolt that you have and use that money to build up a 10bolt rear.

http://www.9bolt.com/

 

ill have to count the bolts again tomorrow, but yesterday i counted 9. Don't see how i got that wrong, but maybe i did.

 

Yeah I understand that. Better to check and be sure.

The important thing is that you are keeping that Z28 on the road where it belongs!

 

If it is a 9 bolt then the posi carriers mentioned above will not work. The 9 bolt was much different from the 10 bolt in that area.
I have 3 10bolts to use to make one. An early disc rear, a 97 4th gen posi disc rear and my current open drum brake 91 rear.
I need the narrower 3rd gen rear with the wheels I am going to use otherwise I would throw the 4th gen under the car.