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Message: [QUOTE="chappy, post: 243549, member: 196"] What fluid have you been running in the rear when you changed it? Some of the fluids like valvoline and royal purple have the friction modifier aready mixed in it. I'm sure you will have the 3 pinion heavier duty carrier. The 2 pinion was used in the lighter applications like the 7700 f250 light duty ect. I believe the excursions got the 2 pinion as well. You won't mess up the clutches by not running the fluid you would just get a chatter feel from the rear end when you take off and are turning . Kinda like when you leave a stop sign and are turning and accelerating at the same time. Might feel like wheel hop. Thats what the friction modifier eliminates. The 9.75 rear end in the f150's is very tight. Even with the modifier they will do it sometimes. Fords actually changed the clutch material at least once to eliminate it instead of having to change the design. The 10.5 really doesn't need it that I have found. They are a loose limited slip and don't give you much of a problem usually besides not wanting to lock up . [/QUOTE]

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