Rear end

[Sick5]

What sign to get before a rear end goes out or when it's getting low on oil
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[raycow]

The most obvious sign would be visible external leakage. It is very easy to check the oil level through the filler plug hole. Most owner's manuals prescribe mileage/time intervals for checking the differential lube just as for other fluids.

Ray

[Sick5]

Well my rear end is leaking. Right were I hook up the driveline.
I've been having issue with a rumbling noise coming from the rear when going around 60 and fades after. I thought it would go away after swapping tranny, balancing driveline addig new ujoints and hoping it would be gone. So now I'm thinking it may be the rearend. In front of the rear end were the nut is there a seal there?
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[jchav62]

Originally Posted by Sick5

Well my rear end is leaking. Right were I hook up the driveline.
I've been having issue with a rumbling noise coming from the rear when going around 60 and fades after. I thought it would go away after swapping tranny, balancing driveline addig new ujoints it would gone. So now I'm thinking it may be the rearend. In front of the rear end wee the nut is I'd there a seal there?
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There is a seal there. The pinion seal. You'll usually hear more of a whining noise out the rearend... as far as a rumbling noise, the damage may be pretty bad. You may have to install a bearing kit. Good luck...

[raycow]

Unfortunately, you might be looking at a pinion bearing failure. That could account for both the noise and the pinion seal leak. Grab the pinion yoke with both hands and see if you can wiggle it. Rotational play is ok, but there should be no in/out, up/down, or sideways movement of any kind.

Ray

[raycow]

Well, if your truck was newer, like from the 70s, I would say you might have a Gov-lock, but I don't think those go back as far as 61.

Ray

[Sick5]

Originally Posted by raycow

Unfortunately, you might be looking at a pinion bearing failure. That could account for both the noise and the pinion seal leak. Grab the pinion yoke with both hands and see if you can wiggle it. Rotational play is ok, but there should be no in/out, up/down, or sideways movement of any kind.

Ray

thanks for the help ill check the oil level in the morning and disconnect the driveline and check the pinion