rear driveline pop

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Joined
Mar 19, 2006
Threads
67
Messages
572
Location
Fort Collins, CO
For at least two years now, as I take off from a full stop, after going a few hundred feet, I get a loud metallic pop in the driveline in the rear. I've checked out the U-joints, and even though they've got 200k on them, they're nice and tight.
Just lately I've been hearing a grinding or scraping sound back there, and the pop still happens.
Everything's good and greased, and always has been.
What's going on? Is my pinion gear missing a tooth? Could the bearing bind and pop like that?
Don't know much about gears, and I can't spend too much on this rusty thing. But I want it to keep running, so I can get to the parts store when I've got my 60 pulled apart.
Any help appreciated.

It's an 87 4Runner.
 
Thank you both.
I'll check out the pinion nut this week.
 
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