Hey guys. I have recently purchased a 87 728 camaro. Its the 305car automatic
was wondering it it was single,positive, or limited slip traction? Any help?

 

Get the code off of the axle on the front of the passanger side and look it up.

 

just remember that the previous owner could have swapped...

if he had the speedometer re-calibrated, get your speed, transmission ratio (what gear your in), and rear tire diameter and google for a rear end calculator...

if the speedometer is off, you can use a GPS and it should get you close enough...

 

The Code on the axle will be correct.

 

Welcome to TGO, Falconsfan.

The rear is either an open or a limited slip (same thing as posi). In theory the axel tube suggestion is a good one; however, the ones I've looked at were rusted to heck and the numbers unidentifiable. You could also check the RPO's. Since the car is 20+ years old though and may not be original to the car--and who knows when the last time the diff fluid was changed--drop the cover and take a peek. If the rear is a 10-bolt, the link below will help ID what you have:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

 

Or you could jack the car up and turn the tires if both tires turn the same way its a posi if not its open you can do it on jackstands to thats what i did .When i went from a 2.73 open to a 3.42 posi out of a 98 4th gen camaro and it made a big difference on my 305 tbi but i have some things done to it im putin down 202 hp and 268 tq to the tires