That is good news, i think i can afford $9 a bottle. Also I have another question, how many bottles do you normally buy when changing the fluid and gasket? And do you have any gasket recommendations?
No idea really, both of my trucks are 10 bolts so I'm not super familiar with the 14 bolt stuff. The 10 bolts are just over two quarts, so I'd imagine the 14 bolts take a little more than that. Three quarts would be 96 fluid ounces, which would be a little over four of those 23oz bottles.
As far as gaskets, I use the OEM ACDelco part number on my 10 bolts. Just took a quick look and I can't seem to find one for the 9.5" 14 bolts like you have. Second choice would be a FelPro, their part number for the 9.5" 14 bolt is RDS55387.
https://www.summitracing.com/parts/fel-rds55387