I've got a 2001 F150 4wd Supercrew with a 3.55 limited slip. I had the diff oil changed last week. I've just noticed, after a long day of highway driving, that it is making a grinding noise and vibration when accelerating from a stop into a turn. It won't do it if accelerating straight ahead, and the truck feels fine when up to speed. If I accelerate with very light throttle and only a light turn, it won't do it.
I'm thinking that the mechanic did not put friction modifier in with the diff lube, and I'm hearing and feeling the clutches in the limited slip grinding. Does this sound like a possibility, or is there potentially another, larger problem going on? I'm taking it to a Ford dealer early in the morning and will have them help assess it. I'm either going to have them open it up, inspect it, and refill with diff oil and friction modifier, or I might just have them suck out some lube and top it back off with the modifier.
Ideas and suggestions are welcome. I'll be towing a VERY heavy boat for about 650 miles over the next two days, as I return home, so this thing has me a little nervous.
I'm thinking that the mechanic did not put friction modifier in with the diff lube, and I'm hearing and feeling the clutches in the limited slip grinding. Does this sound like a possibility, or is there potentially another, larger problem going on? I'm taking it to a Ford dealer early in the morning and will have them help assess it. I'm either going to have them open it up, inspect it, and refill with diff oil and friction modifier, or I might just have them suck out some lube and top it back off with the modifier.
Ideas and suggestions are welcome. I'll be towing a VERY heavy boat for about 650 miles over the next two days, as I return home, so this thing has me a little nervous.