Is there any sign, whether from the vin, year built, % of CUCV's, whatever, that can give a hint or indication if the crank has the hole for the bushing or is it a crap shoot. If it is a total crap shoot what % rate do I have to worry about, from your experiences. I ask this because maybe I should wait until I have a tranny rebuild necessary anyway.
Thanks
None, you'll need to separate your existing transmission from the engine to get a look at it.
You can disconnect the front driveshaft, support the tranmission with a jack, unbolt the crossmember, rotate the flexplate and unbolt the torque converter, slide the torque converter back into the transmission, unbolt the bellhousing from the engine, and then slide the transmission 2 or 3 inches back onto the rear drive shaft yoke without investing too much in the way of effort. At that point you can use a mirror or even a small camera to take a picture of the crank and get a look at it.
You should see something like this (but not exactly, or you'll be replacing your flexplate):
Ignore my arrows, that picture was taken in response to a busted flexplate I had. You'll be concerned with the larger hole in the center. I cannot say for certain with regard to the diesels but GM used the same pilot bushing diameters throughout their standard corporate gasoline V8 offerings. I'd be surprised if it was any different for the 6.2. You just need to make sure the hole is wide and deep enough to accept the bushing. As I recall, they were about $5-10 from the parts house but it has been a while since I needed to replace one. Whatever part number you find for the diesel, should match up with one for a manual transmission Camaro or Corvette.
//use loctite on the six torque converter bolts when you put them back. The rest of what you'll encounter will do fine with 'wrench tight'.