Any knowledge of LSD axles?

truckdoctor · Post by **truckdoctor** » Tue Apr 17, 2012 7:26 pm

Hi , anyone have any knowledge of LSD axles?
I have purchased a Jensen interceptor Mk!! from a rusty wreck thats been sittting in a field for 14 years, anyhow, it appears unlike other normal diffs that if one hub is held stationary and the pinion turned, both hubs try to turn. Could this be correct?
As I have very little knowledge of the internals I wonder if someone could shed some light for me.
Thanks Steve

unstable load · Post by **unstable load** » Wed Apr 18, 2012 7:54 am

In a nutshell, a LSD allows drive to go to both wheels even if one has reduced or no traction, unlike a regular diff that transmits drive to the wheel with the least resistance.
It normally uses a series of discs and friction plates in the gubbins to lock the outputs into one "solid" axle if it senses any inequality in the available traction at the wheels, although there are other methods of actuation.
http://en.wikipedia.org/wiki/Limited-slip_differential
http://auto.howstuffworks.com/differential4.htm

kiwicar · Post by **kiwicar** » Wed Apr 18, 2012 10:08 am

Hi
Jensen interceptors ran pretty much all Mopar (chrysler) running gear, if you have a look here http://en.wikipedia.org/wiki/Jensen_Interceptor it givea a basic run down. The axel is described as a "salsbury LSD" that is just that it is a clutch pack type as said above. I am pretty sure they were Dana 60 axels http://en.wikipedia.org/wiki/Dana_60, spares for them are pretty easily available because they are as if not more bomb proof as a ford 9", have a huge range of ratios are lighter than a ford 9" and are quite a bit more efficient, they have less verticle pinion offset. Strange engineering http://www.strangeengineering.net/catalog/toc.html make spares for them, along with and Jegs, Summit and others carry spares in their catalogs.
Best regards
Mike

truckdoctor · Post by **truckdoctor** » Wed Apr 18, 2012 8:23 pm

The clutches fight this behavior, wanting both wheels to go the same speed. If one wheel wants to spin faster than the other, it must first overpower the clutch. The stiffness of the springs combined with the friction of the clutch determine how much torque it takes to overpower it.

Thats the answer I was after, thank you.

Denis247 · Post by **Denis247** » Wed Apr 18, 2012 9:41 pm

Make sure you use the correct oil, and these diffs usually can't take additives.

truckdoctor · Post by **truckdoctor** » Thu Apr 19, 2012 8:10 pm

What is the correct oil ATF?

Denis247 · Post by **Denis247** » Thu Apr 19, 2012 11:36 pm

Normally hypoy 90, but check your particular one. Never heard of atf being used in a diff. Nor additives, they mess up the lsd action.

ian.stewart · Post by **ian.stewart** » Fri Apr 20, 2012 6:22 am

Im not sure if "must not use additives" is the correct, Dont put slippery additives into the diff, stuff like slick 50 is a deffo non starter.in fact any sort of additives in diffs and gearboxes Im not sure about, put a supper slippy additive into a manual gearbox the additive works against the function of the syncro rings giving you a baulky change.
Just to confuse matters, Ford used to sell a Additive to put into the diff for Atlas plate type LSDs
What you must use it the correct oil for Plate LSDs, there are a few about, but not generally easy to find, I think Castrols version is EPX90 with the X denoting extra Additives to cope with Extra Pressure.
Older Jags use a version of the Dana with a lsd so that may be a place to look,

truckdoctor · Post by **truckdoctor** » Fri Apr 20, 2012 6:11 pm

Thanks for that, it is a Dana 60 axle so will ask about for the correct oil

JSF55 · Post by **JSF55** » Fri Apr 20, 2012 6:33 pm

Loads of info here
http://www.differentials.com/technical- ... tification