Posi trac?
#1
Posi trac?
My friend tells me my 72 cutlass convertible has a posi in it . I'm about to pull the aluminum cover drain and fill how do I know for certain it's a posi and if so what is the additive I use in it? Thanks ps I don't see the w27 stamp on the cover
#5
There is only one kind. "Posi-Traction " and "Limited-Slip" are two different trade names used by various car makers to refer to controlled traction differentials.
Last edited by Charlie Jones; August 19th, 2013 at 07:09 PM.
#6
No, there are two types
1) "open" where one wheel spins and the other does not.
2) Various names for controlling slip- positraction, Limited Slip, etc. Various mechanisms are used also, but ALL involve more than just some spider gears that are totally free to move.
You might want to watch the testimony of Ms. Vito in "My Cousin Vinny" also
1) "open" where one wheel spins and the other does not.
2) Various names for controlling slip- positraction, Limited Slip, etc. Various mechanisms are used also, but ALL involve more than just some spider gears that are totally free to move.
You might want to watch the testimony of Ms. Vito in "My Cousin Vinny" also
#7
With all due respect, there are 4 types, sort of.
1. Open.
2. Limited slip
3. Locking.
4. Direct gear transfer.
A locker can be locked by the car or by you, either electrically, cable actuated, or turning some bolt.
The reason I included direct gears is that a lot of the old 4 wheelers just had a straight gear set with no differential gears. I guess the closest thing cars have is a spool for draggers.
1. Open.
2. Limited slip
3. Locking.
4. Direct gear transfer.
A locker can be locked by the car or by you, either electrically, cable actuated, or turning some bolt.
The reason I included direct gears is that a lot of the old 4 wheelers just had a straight gear set with no differential gears. I guess the closest thing cars have is a spool for draggers.
#8
The cover for the rear must be after market it has no numbers or markings on it that I can see . I guess I'll know for sure when I pull the cover and see what type of gearing is in there if I remember the open rear end will have the main gear and the two spider gears?
#11
The cover for the rear must be after market it has no numbers or markings on
it that I can see
#12
Positraction,Limited-Slip,Sure-Grip,Safe-T-Trac,etc. All the same thing.
Non-posi,Open,Peg-Leg,One-Wheel-Wonder,etc. All the same thing.
Now there are different types of posi units: clutch style,cone style,coupler,helical gear.
Non-posi,Open,Peg-Leg,One-Wheel-Wonder,etc. All the same thing.
Now there are different types of posi units: clutch style,cone style,coupler,helical gear.
#13
The obvious correct way to ascertain the information!
"With all due respect, there are 4 types, sort of.
1. Open.
2. Limited slip
3. Locking.
4. Direct gear transfer. "
=========================
OK, sure, but for most purposes, by far the most common is 1) Open, followed by a few 2) "posi" or similar name not-open differentials... the other 2 are few and far between. The chance of finding anything other than 1 or 2 in a std issue car is right about zero.
When you pull the cover the guts should show right away if it's open. Your tooth count will be stamped into the OD of the ring gear, like
"11 39"
Divide the two numbers to produce the gear ratio- in this case 3.55
"With all due respect, there are 4 types, sort of.
1. Open.
2. Limited slip
3. Locking.
4. Direct gear transfer. "
=========================
OK, sure, but for most purposes, by far the most common is 1) Open, followed by a few 2) "posi" or similar name not-open differentials... the other 2 are few and far between. The chance of finding anything other than 1 or 2 in a std issue car is right about zero.
When you pull the cover the guts should show right away if it's open. Your tooth count will be stamped into the OD of the ring gear, like
"11 39"
Divide the two numbers to produce the gear ratio- in this case 3.55
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