How quarts of transmission fluid are in a GMC/CHE pu with allison transmission...

Dry system capacity with the shallow stock (OEM) pan is 12.7 quarts.

Dry system capacity with the optional deep pan is 15.9 quarts.

Drain & refill with the shallow stock (OEM) pan is 7.4 quarts.

Drain & refill with the optional deep pan is 10.6 quarts.

Use DEXRON III fluid.
 
Fill After Rebuild, 12.0L/12.7qts
Fill After fluid and filter change, 7.0L/7.4qts
 
If you have owners manual check their or call auto Zone or Kragen.
 
Fill After Rebuild, 12.0L/12.7qts
Fill After fluid and filter change, 7.0L/7.4qts
 
According to my references The Allison 1000 Automatic Transmission

Automatic Transmission, 5 speed 1000 Initial Fill..........7.4 quarts[2]
Automatic Transmission, 5 speed 1000 Total Fill..........13.0 quarts
 
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