00exjay

Got a 2000 Cherokee with a 8.25 how do I know if I got a LSD?

sthon

jack up the rear and spin the tires. If they spin the same direction you have LSD, opposite direction open diff.

00exjay

Thanks!

dogkatcher

is this close to a posi track ?

still learning axle stuff

noticed "while not in" 4 wheel drive ... slip in rear on snow/ice .. rear end just sways on my 90

what would 93 have? Im crawling under tomorrow to check fluids .. gonna write down part #s .. seems the axles stick out a bit w/ tires .. havnt pulled tires off yet, could be spacers

we'll see

00exjay

Posi trac is just another name for limited slip

00exjay

Yes should be Dana 35 and wheel spacers thicket tires and rims that stick out are all possible

djb383

There r 3 basic types of diffs.....open, limited slip and locking, the latter 2 being traction enhanced diffs. Posi or Positrak is a GM/Chevy name for their version of a limited slip diff.

XJ.89.Limited

Posi- both tires will spin the same way when jacked up (dad's chevelle has one). No matter what, both tires will spin and have power. Basically a locked diff, but it has a slight amount of give for cornering. Locked diff will always have power, and can even be tuned for one wheel to have more power than the other in some cases. That is common in road racing.

LSD- tires will either spin opposite ways or only one will spin. When one wheel is free, it will get power. When both wheels are down on the ground, they will each give and grab depending on which gets traction when. This is a plus over an open diff. I can post a pic to prove this (D35 LSD ).

Open diff- only one tire will ever spin, no matter what. Common on small 2wd pickups (s10, ranger), because they don't get traction anyway.

XJ.89.Limited

Here ya go:

foratm

How are the detroit lockers, true track?

XJ.89.Limited

I believe lockers act as a limited slip until they are engaged, but don't quote me on that. Never had one, so I don't know. haha.

caged

how to tell if you have LSD, simply remove the diff cover and look inside the carrier to see if you have clutch packs. or look inside your glove box, there should be a sticker saying you have a locking type rear differential. this is chryslers track-lock(lsd) or trash-lock as referred to by some.

only some lockers, like those in the rubicons. they are air/limited slip in the tj rubi's and electric/limited slip in the jk rubi's.

detroit true track and other auto lockers are locked until the wheels are forced to turn at different rates of speed.

not sure about ox or arb lockers as they are only locked when engaged, but may or may not have lsd clutches like the rubi.

all ausie's/lock-rite lockers are engaged until wheels are forced to turn at different rates of speed and have no clutches.
always locked in a straight line, or clicks when turning.

Rock Toy

Lot of misinformation about lockers and LSDs. A Detroit TruTrac is a gear driven torque biasing LSD not a locker. A Detroit Locker is a full case automatic locker, and it doesn't work as a LSD until it locks. Detroit Locker and Detroit TruTrac are two completely different differentials.

Posi-trac is GMs trademark name for their LSD, it is not a locker.

Electric controlled traction enhanced differentials are the only LSD I know of that will act somewhat like a locker until the clutches go away.

djb383

Posi or Positrac is a GM/Chevy name for their version of a limited slip diff. Lots of different brand names for limited slip diffs. Kinda like Kleenex is a brand of tissues. A limited slip is not a locked diff and a limited slip diff can turn into a 1 tire fire just like an open diff. Only a locking diff will provide constant torque to both axles when locked. Again, there are 3 basic types of diffs.....open, limited slip and locking. A locker is nothing like a limited slip. A locker does not slip like a limited slip can.

Here's a decent video shoeing how the 3 types perform. Forget that it says G80, that's just a GM brand name for their version of a locking diff.

Eaton Locking Differential Demonstration - YouTube

XJ.89.Limited

My dad's chevelle always lit up both tires, and it has posi-traction.