rear differential shack!

[rmb1393]

My brother has a 2004 f-150 and it is leaking fluid very slowly but it is still leaking and he has noticed in the past two days a shack starting to develope and we are both wondering what this could be?? any help please!!!!! don't want to destroy the diff

[2006PSDSD]

Shack????????

[rmb1393]

Originally Posted by 2006PSDSD

Shack????????

shake hahahahahaha

[2006PSDSD]

Shaking or chattering? Certain speeds, around corners? The limited slip clutches will chatter when the fluid gets low or the fluid is dirty. That could be it. If it's actually shaking, maybe look at U-joints. I've never heard of a rear end making the truck shake, unless it was right bfore it blew up

[rmb1393]

Originally Posted by 2006PSDSD

Shaking or chattering? Certain speeds, around corners? The limited slip clutches will chatter when the fluid gets low or the fluid is dirty. That could be it. If it's actually shaking, maybe look at U-joints. I've never heard of a rear end making the truck shake, unless it was right bfore it blew up

the truck doesn't have limited slip and it started around 40-70 mph and now it does it at any speed. and yes you feel a shake

[2006PSDSD]

I'd look at the u-joints. Unless you ran the diff empty, I don't see you feeling a vibration in the truck from the rear end. Maybe a bearing whine, but not a shake