Several questions:

Is 90 weight gear oil + additive for Suregrip OK for 8 3/4" rear?

Dextron III ok for A 904? (Non racing car with oil cooler)

Dose cast deep base add extra two quarts of transmission fluid over factory pan?

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

80W-90 is more common and superior in most cases to SAE 90. GL-5 with the additive or GL-5+ can usually be used without the additive. No additive needed if you don't have Sure-Grip.
Dexron III is fine.
Capacity depends on the pan. I feel it's a waste of time and money at this performance level.

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Joshua

Thanks Josh
wjajr wrote: Came bolted on the darn transmission when I purchased the car.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC