View Full Version : Posi/Gears
band77one
11-10-2005, 10:21 PM
ok so i have an 88 iroc, it has 3.08 gears, limited slip, is limited slip a posi rear? i dont really know anything about rears, but it would help, i dont want to waste money on a rear thats the same as mine with different gears. I want to put 3.73's in my car if its only got 3.08, or would 3.42 gears be better?
NJSPEEDER
11-10-2005, 10:59 PM
limited slip and posi mean the same thing.
3.73 gears are definately a good call. you really could get away with more gear if you wanted to, somethign like 4.10's are perfectly streetable and daily drivable and will give you an even larger gain than the 3.73's will.
camaro2you
11-11-2005, 12:22 AM
posi both at the same time all the time limited slip one wheel spins while the other is free while going around turns and when going straight sometimes both will kick in.
band77one
11-11-2005, 07:15 AM
is it better to have regular posi or limited slip ?
Injuneer
11-11-2005, 07:37 AM
As Tim already pointed out..... "limited slip" and "posi" mean exactly the same thing. Its a differential using a system of clutches and ramps that allows the rear wheels to move at different speeds when the car is going around a corner, and starts to tie the two axles together when one wheel starts to slip. Back in the ye olde days (when I was your age) Chevrolet trademarked their limited slip differential "Positraction"..... and from that point on, "posi" meant limited slip dfferential. Pontiac called the same thing Safe-T-Track, but their name never really caught on.
There are also limited slip diff's that use other means to tmeporarily tie the two axles together.... e.g. the Torsen unit that uses some cones.
I limited slip differential should lock both axles together when one of the them starts to slip. But because the clamping of the clutches is somewhat dependant on the torque being transmitted, you don't always see both wheels hooking at low loads. But under full throttle, the only way one wheel would slip was if the clutches are worn out.
Then there is a "locker"..... when one wheel starts to slip, it mechanically "locks" the two axles together, so both wheels transmit the power. Works similar to a limited slip, but can be a bit jerky, because its either fully on or fully off. And finally a "spool", which is a solid piece that splines to both axles and does not let the wheels ever turn at differnt speeds, which can be a bit of a problem on the street when you try and turn a corner.
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