Lsd

[ppetion]

What is the best way to find out if a transmission is LSD.

Transmission is not mounted in the car.

Thanks

[bgyglfr]

I believe you turn one of the output flanges the other should turn the same direction. If the other turns opposite, it's not an lsd.

[Pazuzu]

Or take off the side plate and look inside...

Remove flange bolt, remove flange, remove side plate, carefully hammer it off, examine differential.

[DRACO A5OG]

Originally Posted by bgyglfr

I believe you turn one of the output flanges the other should turn the same direction. If the other turns opposite, it's not an lsd.

+1, Just raise and spin the wheels

[porsche930dude]

also a factory LSD trans will have a 12 in the middle of the serial number if its a 915

[Peter Zimmermann]

Originally Posted by DRACO A5OG

+1, Just raise and spin the wheels

Yep, with BOTH rear wheels OFF the floor, trans in neutral, and e-brake off, turn the right rear wheel. If the left rear wheel turns the same direction, you have LSD.

[Bill Verburg]

th spin the wheel test doesn't always work
one reason is the lsd is worn out and another is that the low pre-load used on some just doesn't act the way you would expect

The ZF 40% unit in my '76 works as described above, you can also feel it in tight turns at low speeds

The much more effective Porsche Motorsports 40/65 in my 993 is never felt at all under normal low speed operation but is far more effective at track speeds and loads, it can appear to be open w/ the casual casual wheel spin test.

one way to improve the test is to hold one wheel will spinning the other, this places a bit more load and the lsd resistance can usually be felt

for oe lsd look for the 12, this is a 915/73 from an '86 911 seril # 03454

[Peter Zimmermann]

It would help if the OP posted the type of car he's got...

[ppetion]

As I mentioned motor and transmission are not mounted in the car . Motor is a 3.2 L

I spined the flange and they went opposite direction .
The vin number is not fully readable . I don't think it is an LSD.

Thanks to all who educated me on this topic .