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  #11  
Old 12-23-2011, 01:03 PM
whatroads whatroads is offline
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One thing to keep in mind with LSD. It's operation is only as good as the friction plates. Typically, Chrysler LSD's don't have real strong lockup. I've seem many Jeeps, in off road situations, that have LSD where when one wheel was in the air it simply spun. The wheel on the ground was not getting strong enough lockup, from the LSD, to move the Jeep forward.

I have an LSD. As stated earlier in this string the only real test of an LSD is to jack up the rear and spin one tire. My LSD will work for now. My future is likely to include a Detroit locker though. I've used Detroit's on several of my previous Jeeps. Their tough and reliable
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Old 12-28-2011, 09:22 PM
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One great thing with the 3.55 gears is you will get better gas mileage. i have the 3.92 with LSD and my mileage is not as good because i tach about 250rpm more at 110km then my buddies truck. i have never got better then 16.5 mpg and that is driving the prairies at 105kph with a tonnoue cover and K@N drop in filter. I tow a camper so wanted the bigger gears but for day to day driving yours are great.
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Old 01-10-2012, 12:38 PM
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I have a '12 Express with 3.55 gears and LSD according to the build sheet and broadcast sheet. The truck has the new style ZF 245mm rear axle with the drain plugs on the passenger side of the axle housing and no filler plug in the differential cover.

I tested the LSD by lifting the axle up so that both wheels were up and in neutral and rotated the left tire by hand and the right tire rotated in the opposite direction. Then I lowered the truck so that only the right tire was on the ground and I could spin the left tire that was off the ground. So I'm like hmmm what's up with this LSD.

Next I drive to a open asphalt parking lot to do a pavement test. I pressed off the ESP button and then poured water on the left tire and in front of it and the right tire was on dry pavement then nail it which spun both tires. Then I poured water on the right tire with the left tire on dry pavement and nail it and both tires spin. The I do a brake torque on dry pavement and both tire spin and finally I pour water on both tires and in front of them. Then cut the wheels to the left and nail it and do a 360 with both tires smoking.

So I'm confused about testing the LSD, it acted like a open differential with the tires off the ground but on pavement it behaves like a LSD with both tires spinning
even with unequal traction. This must be a torque sensing differential because it will act like a open differential until torque is applied then both wheels spin.

Anybody know what type of LSD they are using for the 245mm ZF axle?
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Last edited by jmr; 01-10-2012 at 05:46 PM.
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