There wasn't any transmission put into 1980 Chevy pickups that shifted hard enough to need double-clutching. That applies to older HD sliding gear transmissions. Not collar-shifted transmissions like you've got. I assume you've got the Muncie SM-465. Only sliding gear with no synchros is the granny low.
Transfercase, if cast-iron is likely the 205. It does not have near as low a low-range as the chain drive 208 or 241. Cast iron 205 only has a 1.9 to 1 low range. Aluminum 208 has 2.6 to 1 in low, and the 241 (replaced 208 in 1987)has 2.7 to 1 in low.
As to gear oil, the 90W versus thinner Dextron has nothing to do with being heavy duty, or not. If that were true, there would be an alful lot of hugh HD Allison industrial transmissions blowing up.
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