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Message: [QUOTE="chappy, post: 244116, member: 196"] Alright I run shaeffer as well. They do not have the friction modifier in it even though they are a high end oil. I discussed this with the shaeffer rep a couple weeks ago when I was changing the diff fluid in a buddies f150 and replacing with shaeffer. The rep told me that he only suggests the friction modifier in the f150's because of the tight clutch packs. The super dutys and chevy rear limited slips he said don't bother adding it because they are loose enough already. If you change it leave room in case you feel you need it but my guess is the shaffer is slick enough you don't need to add it in that rear end. And a ford trac loc will not lock on an off camber situation as you described. You can take a turn to hard and give the truck a little body roll and it will unlock. I've never run a true trac diff but from what I've heard it would lock in the situation you described. Crappy thing is the ford trac lock and the detroit true trac are about the same price new so if the idiots would of listened then you could have had it for about the same price. [/QUOTE]

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