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87 came with 10 bolt from the factory.The later 700r4's are fine.If the PO swapped out the TBI, you may have issues with inspection (if you have them).Pics?
The 10 bolt was fully implemented into the half tons in 1982 so no the 12 bolt is not stock. The 208 has a full aluminum case and the 205 is cast iron so that should be an easy spotter right there.
12 bolts were in these trucks for a few years. Stronger than a 10 bolt....
Quote12 bolts were in these trucks for a few years. Stronger than a 10 bolt....This is not true. 12bolt trucks had a MUCH smaller pinion than the 12bolt cars and it is smaller than 10bolts.