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You would have to change the case to get all the updates on an '83 transmission. Run the #'s off of the tranny to see what year it was, maybe he had a different core used already... you will still need to buy another core for the output shaft though. And the 2wd and 4x4 cases were slightly...

The '83 700R4 should be avoided as a starting point, you would end up needing another core anyway for all the parts your missing. Than and you want one from an '87 or later with more of the updates if you want to go that route. 36" tires and 4.56 gears would be a good combo for the 6.2L and the...

The driveshaft out of the civi blazer will be too short, but you can reuse the driveshaft from the M1008 though without modification. Your biggest problem is going to be the durability of the stock 700R4.

Building the 700R4 can last if your not towing to full capacity of the truck (M1008). But the wiring and computer from a '91 K30 with the 6.2L and 4L80E is stand alone and doesn't cost that much if your good at searching for the right parts. I have bought those setups in the past for less than...

What are you putting it in, an M1009 or M1008? For an M1009 a stock transmission can be ok, but they are not known for being reliable. There are a lot of upgrade parts available that will help them last. You will also want to change out the axle gearing as 3.07 gears will not work for the OD...