The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Loud Bang from the Rear End

I used a 12 bolt posi in my off topic Model A Hot Rod.

It chattered really bad when I first got the car on the road. I ended up using two tubes of GM posi additive to get it to stop chattering.

And yes, the posi still works, as is evident by two black tire marks when I put my foot heavy on the foot feed.