limited slip not working
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Joined: May 2009
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limited slip not working
i have a 2002 CC f-250 5.4 4x4 and the other night i got over a bank and started spinning, i noticed only 1 tire turning over. could my LS rearend need friction modifier added?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
You only need modifier if the clutches are chattering. Do some more testing, the rear end needs some wheel contact/friction for it to work. It won't work if there is almost zero friction on one wheel.
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More Turbo
Joined: Feb 2006
Posts: 538
Likes: 11
From: Shiner, TX
As the others have said, it's working normally. Unfortunately. The limited slip differential is very mild.
It'll probably spin both tires at the boat ramp or on a snowy road or in light mud, but even then you just never know. The minute you start talking about driving across banks, ravines, wash-outs, ditches, or any other surface that articulates the suspension, be prepared for a one-wheel-peel.
There are several figures floating around regarding the break-away torque designed into the clutch plates of the OEM limited slip carrier... they've all been under 75 lb./ft. when new! That aint much. That's low enough to spin one tire even if both wheels were level on the ground. Put one tire in clover and the other on grass- there's a good chance the tire on clover will spin.
It'll probably spin both tires at the boat ramp or on a snowy road or in light mud, but even then you just never know. The minute you start talking about driving across banks, ravines, wash-outs, ditches, or any other surface that articulates the suspension, be prepared for a one-wheel-peel.
There are several figures floating around regarding the break-away torque designed into the clutch plates of the OEM limited slip carrier... they've all been under 75 lb./ft. when new! That aint much. That's low enough to spin one tire even if both wheels were level on the ground. Put one tire in clover and the other on grass- there's a good chance the tire on clover will spin.
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Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Right, like the positraction they need some resistance to work. With a stick shift and plenty of HP you could smoke both tires and then go to a slippery mud puddle and just spin one. The initial preload is just to keep it snug so they are quiet. If you had one side on rollers it would just sit there and spin that wheel.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
I've got amosil 75-140 Severe Gear full synthetic in 10.5 with NO modifier and get zero chatter. If you do have excessive chatter only add small amounts of friction modifer until the chatter goes away. But anyway friction modifier won't help the OP.
Exactly. I can leave "Posi" marks on a dry road only when going stright but if theres a slick spot in the road the wheel with the least traction will unload.
As the others have said, it's working normally. Unfortunately. The limited slip differential is very mild.
It'll probably spin both tires at the boat ramp or on a snowy road or in light mud, but even then you just never know. The minute you start talking about driving across banks, ravines, wash-outs, ditches, or any other surface that articulates the suspension, be prepared for a one-wheel-peel.
There are several figures floating around regarding the break-away torque designed into the clutch plates of the OEM limited slip carrier... they've all been under 75 lb./ft. when new! That aint much. That's low enough to spin one tire even if both wheels were level on the ground. Put one tire in clover and the other on grass- there's a good chance the tire on clover will spin.
It'll probably spin both tires at the boat ramp or on a snowy road or in light mud, but even then you just never know. The minute you start talking about driving across banks, ravines, wash-outs, ditches, or any other surface that articulates the suspension, be prepared for a one-wheel-peel.
There are several figures floating around regarding the break-away torque designed into the clutch plates of the OEM limited slip carrier... they've all been under 75 lb./ft. when new! That aint much. That's low enough to spin one tire even if both wheels were level on the ground. Put one tire in clover and the other on grass- there's a good chance the tire on clover will spin.