How can u tell a LSD from an Open Diff

[Rav335uk]

Hi guys, can u tell me how to tell as above as i have one but no markings.
It's a large case.
Thanks

[noney82]

i got told to do a big wheels spin and if you leave 2 tyre marks its a lsd. i take it there is no ID tag on the box

[DHFiS]

Jack both rear wheels of the ground, spin one by hand and if the other spins in the same direction it is a LSD, if it spins in the opposite direction its an open diff.

[Rav335uk]

Diffs not on the car atm, it on a bench, so more info now please

[monkey]

i think im right in saying if you hold the input shaft and then turn one of the output shafts , if the other output turns the same way the one you have turned then its and lsd if it goes the opposite way then its an open diff

[uzdubmwe30]

same as above, should spin the same way, if in doubt take the back cover off and look at the internals.

[Rav335uk]

Ok will try tomorrow,Thanks

[Theo]

Just try and turn the output shafts in opposite directions. If you can, it's an open diff.

[Rav335uk]

Cheers lads, can confirm an open diff.

[Brianmoooore]

The standard test doesn't work for a torsen type LSD. The only way I know of to identify these is to tale off the rear cover and see what's in there.

[cecotto479]

The tag indicating the ratio has a "Z" or "S" prefix.