I wish the search function was working. Someone posted a great write up on the diffreces off the BIG10 by year a couple months ago.
Basicaly in the first couple of years the BIG10 was the way that GM got around smog requirements on a 1/2 ton.
The weight limits on the truck were rased just above the cut off for smog equipment.
I believe after 1979 the weight limit was rased which brought the BIG10 back into smog requirements.
Once the search function is enabled again do a search on BIG 10 and look for the write up. It was the best information on a BIG 10 I have ever seen.
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