OK I got some pics, they are all scaled to 1440x1080 pixels, so if you need a closer look just click them for a larger view. Pay no attention to my dark, dingy work area lol.
First shows pinion scarring on the LSD's case due to a loose pinion nut...
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Next is the other side, showing the same...
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Next is overhead view of diff and ring gear. Production year "78" is circled in red...
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Up next is pic 1 of 3 showing condition of the ring gear teeth, which all look good...
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2 of 3...
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3 of 3...
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Pic of brand name of gear set, Richmond Gear, USA...
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Pic of "back side" diff opening, showing crosspin and side blocks...
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Pic of "front side" diff opening, showing locking mechanism which for the most part is in good shape...
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Pic 1 of 2 showing problem areas of locking mechanism's large gear. Here there are 4 teeth missing...
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Pic 2 of 2 of problem area, 1 tooth missing on the large gear about 1.5" away from other area...
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Now on to the pinion...
Overview of pinion. Note the crush collar, you can reuse it by using a vise and hammer to expand the crush if you like or you can buy a new one, it should be less than $10...
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This pic shows some information engraved on the bottom of the pinion. It also shows a chipped tooth, shown circled in red...
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Another view of the chip. If you look closely at the shiny area above the chip and the black area where the chip is, it shows that the gears were not running on the chip, that the chip was a result of a loose pinion nut (ALWAYS use red thread locker!!) and not a result of incorrect setup...
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And a final picture of the condition of the other teeth...
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If you buy these parts they will get a quick wash in the parts washer, compressed air dried, light coat of machine oil, and a good wrap/packing job to prevent any damage. Shipping via Fed Ex they will be insured for free for $100. Parts sent are guaranteed to be the same parts in the pics. Beyond that I can't take responsibility for your ability or inability to properly set up the gears. There are a couple write-ups here on the forum I have done that can give you the general gist of it, and I will be willing to help with the technical side of it if you need it. I have no shims or bearing races to provide, but will throw in a 1310 strap-style pinion yoke for free if you want it, and WILL provide the pinion nut. Even though I quoted $29 to ship I will go ahead and say it may cost as much as $40 to ship, given my recent experiences with Fed-Ex. I've sold several parts here on the forum so I'm known to be a fair-and-square dealer, some of the transactions can be reviewed back through this thread. If you have any questions, further picture requests, or other comments post away, or PM me if necessary. Thanks for looking!
I'm sure the truck will really like them when I finally get around to installing them. She's got pep now, but I'm expecting quite the kick in the butt dyno after this. 
