742 makes it the large pinion 8 3/4, and will likely have the good clutch sure grip, if it has one.
Three stock gear ratios for 69 runner, 3.23 open or sure grip, 3.55 or 3.91, both automatically a sure grip.
With both rear tires off the ground, manually turn one tire. If other tire turns same direction, 95% chance it's sg. If it turns opposite direction, it's open, and 95% chance it's 3.23.
Assuming it's a sure grip, with both tires off the ground, in neutral,
turn the rear tires one turn, and count driveshaft revolutions. 3 1/4 will be 3.23, 3 1/2 will be 3.55, almost 4 will be 3.91.
If the gears have been changed, all bets are off.
The numbers you mentioned have nothing to do with gear ratio.
(Too bad it's not a lynch road car. Rearend ratio code is on the fender tag.)