thinking abotu putting a positraction unit into my car but there is no way to tell the gear ratio without opening up the housing. does anyone know the stock gear ratio for a 91 camaro rs with the 305 v8? i called idfferent dealerships in my area and they couldnt help me using the vin number. i know it is either a 2 or 3 series ratio but i need to know which. the posi will only work with a 3 series ratio, thanks

 

IF its original

Auto tranny=2.73
5 speed=3.08

 

thank you sooooooo much, now i need a gear conversion kit to get the posi in, but it will be worth it

 

You just need a 3 series carrier and 3 series gear. That is not the only way but may be the cheapest. 3 series carriers and gears out of a 4th gen would be a good starting point. If you don't trust used parts you can always buy new gears from many different companies that will for your rear. Gear swaps and a posi are great for any 3rd gen car, even if it is a 305 TBI

 

the thing is you can use 3-series gears (ring and pinion) with a 2-series carrier because the carrier is smaller than the ring gear and an adapter/spacer plate will make it work. you cannot use a 3 series carrier with a 2-series ring gear because the ring gear is too small to fit over the carrier. also remember that some housings that came with 2-series gear and carrier might be too small to fit in the 3-series ring or carrier. and make sure to have your new ring pressed onto the carrier housing, don't just try and pull it up with the screws like i heard of someone else doing before...

 

i have a 91 305 tbi 5 speed and i recently installed a powertrax diff locker, actually called the "No-Slip Traction System". works pretty good, im happy with it. not terribly expensive and it took about 30 mins to install. it definatly got me threw the snow this winter.

just a FYI