LS not spinning both tires
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LS not spinning both tires
I have a 2005 F150 5.4 with the 3.55 LS rear end. I just changed the diff fluid to Lucas 75W140 synthetic and added 4 oz of motocraft friction modifier. The gears looked great when I had the cover off. But now my truck only seems to want to spin one tire. It was on a ice covered road so it shouldn't be that one tire was catching more traction than the other. Could a simple oil change cause the limited slip to stop working?
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From: Chandler
Could be a few different things... there has to be some traction or resistence on the 1 wheel for it to transfer the power to the other. Applying a little e-brake or brake pedal could help. Also, I've heard that 4oz isn't enough of the friction modifier and 6-8oz is the appropriate ammount. Was the fluid pretty dark when you changed it? Mine was almost as black as dirty motor oil because my cluthces wore out. I now have a Detroit Truetrac in my rear which works way better than the factory units.
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Clutches appeared to be okay and oil was actually pretty clean when I drained it. I thought friction modifier made the oil "slipperier" so wouldn't adding more cause even more slip? I had only added the 4oz because the lucas oil says it already has the additive in it, so I didn't want to add to much. But I read somewhere on here to still add the friction modifier with oils claiming they don't need it. I'm wondering if I have to much modifier now and its causing excessive slipping
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From: Chandler
Could be the Lucas Oil stuff. Not sure how that works with the Ford LS units. IMO using the factory fluids is the best way to go. I have synthetic in mine now but that's because I got sick of the clutches wearing in the factory LS and had a Detroit Truetrac installed. No clutches.
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