Help I think I broke my diff?

[elibenson]

Originally Posted by FX4STROKER

OK everyone heres an update. I pulled the diff cover and everything looks good. The gear oil did look alittle milky and seemed kinda thin. I put mystic gear oil in and put new rtv. took it on a drive and its not poping anymore when I turn. But its whineing like its tight but it only does that when I turn. Any ideas now

First of all, I was going to suggest that you at least change the oil before you go through the trouble of returning it to stock and taking it to Ford.

Then I saw that you had done that.

Then I was horrified to see that you used RTV sealant on your very expensive rear-end. Understand that RTV sealant is bad news for rear-ends. All those little pieces that get submerged in oil before they set break off and get lodged in the oil passages that oil the pinion bearing. You can imagine how well that works for the pinion bearing.

I wrecked the hell out of several of my ambulance rear ends this way before the mechanic that rebuilds them finally taught me what to use. There is a product called "Right Stuff" by Permatex http://www.permatex.com/brand_right_stuff.htm that is specified to use on these rear ends. I would highly recommend that you fix this quick before you do damage. If ford finds orange RTV in your pinion bearing, they will not honor the warranty on the rear end.

And finally, Did you put any friction modifier in when you refilled the rear end? That is probably why you are hearing the whining noise around corners. That is your LS clutches being unhappy with you.

[NIT2WN]

Just take it to the dealer, that's what a warranty is for. I blew the clutches out of mine and took it in. They supposedly rebuilt the traction lock but I'm not too impressed. The truck went from no limited slip to almost a locked rear end. They said it would 'wear in' in about 500 miles. It's doing the same clunking around turns your is, which is it's not allowing enough slip between the rear tires. I'm sure they're wrong and don't won't to re-shim the rearend, but I'll try it. I would be very careful in the rain, mine has become 'tail happy' since the dealer's work.

[dzchey21]

man i would love to have it damn near locked all the time.