I don't believe total gear ratios are determined by multiplying the transmission gear ratios times the rear end ratio but by adding the ratios.
IE: 2.94 x 4.11 = 12.08 should be 2.94 + 4.11 = 7.05.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine