Positraction Identification
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 916
Likes: 2
From: prescott arizona
Positraction Identification
Hi everyone, I'm new to the C2 side of the forum as I usually hang out on the C5 section. Tomorrow I trailer to Las Vegas to pick up my newest acquisition, a 1965 coupe with the 300 hp engine, powerglide, ps, pb and original knockoff wheels. It just finished a complete cosmetic make over and with the powerglide and power steering and brakes it will make a nice car for my wife. My question is --- how can I tell if it is a positraction car? 
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
The easiest way is to light up the rear tires and see how many stripes they leave. But with 300 horses and a powerglide, that's not likely to happen. Unless you do it on a dirt road....gently of course.
The other way is to jack up the rear end, both tires off the ground. With the car in neutral, turn one tire by hand. If the other tire turns the same direction, it has posi.
The other way is to jack up the rear end, both tires off the ground. With the car in neutral, turn one tire by hand. If the other tire turns the same direction, it has posi.
Le Mans Master
Joined: Jan 2007
Posts: 6,004
Likes: 1,509
From: Prescott Arizona
Differential Codes
Steve, two ways to find out if it has posi come to mind. One is to look in towards the fill plug on the passenger side of the differential.
If you see this red plastic marker held in place by the fill plug, it's 'probably' a posi diff.
The second way is to get the car up in the air and crawl under the differential and read the stamped codes on the bottom of the diff.
After you have the numbers/letters, post them and someone will translate the gear ratio and whether it's a posi unit or not.
Mike T.
If you see this red plastic marker held in place by the fill plug, it's 'probably' a posi diff.
The second way is to get the car up in the air and crawl under the differential and read the stamped codes on the bottom of the diff.
After you have the numbers/letters, post them and someone will translate the gear ratio and whether it's a posi unit or not.
Mike T.
Burning Brakes
Joined: Dec 2002
Posts: 1,062
Likes: 5
From: Hasbrouck Heights NJ
So if the wheels on my car usually spin in the same direction, it means posi. I have noticed lately that it sometimes spins like a non posi (wheels spin opposite). Does that mean a re-build is soon needed?
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
Verify this, because I'm not absolutely sure. With posi, the wheels will turn in the same direction if the trans is in neutral and the driveshaft is free to turn. The wheels will turn in opposite directions if the trans is in gear and the driveshaft can't turn.
