I Know this is a wicked nEwb question, but i dont know what my RAR is I have a 1989 Camaro IROC-Z 350TPI. About how much HP / Torque can my stock rear take... And maybe this is the wrong place to ask this, I have sub-frame connectors and drag bars on the rear axle how much power can I have before i worry about putting in a roll cage... (ps I do have T-Tops)

 

I must be a noob too then...whats a RAR?

RAWR!!!

 

Never heard of a RAR either!

 

Rear Axle Ratio?

 

If its rear axle ratio I am 99% sure you have a 9-bolt rear end with 2.77 gears. You're going to need a whole new rear end to swap in there if you want to change it, as 9-bolt parts are almost impossible to find. I'm running 12's on my 9-bolt with 3.70 gears and now 4.10 gears, but I was lucky and got mine long ago when they were available.

If you go to the dragstrip, you wont need a rollbar until you run 11.40's. And you'll be a long ways away from that.

 

Yeah rear axle ratio, I guess im used to crownvic.net its more of a popular acronym, but when do I have to worry about the structural integrity of the car enough to need a roll cage the 383 is somewhere in the neighborhood of 450hp and 500ft ilbs.

 

worry about it when you:

A. Tear the car at the roof seams at the rear of the window

B. Turn a driveshaft into a corkscrew

C. Rip your motor mounts

D. Lift the front left tire off the ground on takeoff

 

A 1989 with a 350 TPI has a 9 bolt diff. It came with crappy 2.77 gears. If you have the performance RPO code G92, it will have better 3.27 gears.

I pushed a 3.27 geared 9 bolt into the very high 11's with no problems. I switched to a 10 bolt for better gear options for a couple of years which got me into the low 11's then switched to a 9" when I installed a transbrake. I started with sub frame connectors the first year and only ran high 14's. The second year, after a bunch of changes, I hit 12.0 on the first race of the year and put a 6 point roll bar in before the next race. At the time, you needed a roll bar at 11.99. Now it's 11.49. The 6 point bar stayed in for a few years until I was just about into the 9's. I then took out the roll bar and installed a full cage.

I've never had a problem with my T-tops in all the years I've raced my car.

 

Is the RPO code in my VIN or where do I find it Im thinking about just opening up the diff and start counting.

 

The RPO codes are on a decal inside the glove box. If the decal is gone or unreadable, you'll never know what options the car came with.

 

you could take the vin to chevy and they will give you the codes.