goggle images of dana 44 and dana 35, there are distinctively different in looks, then compare to yours, you will know straight away. The Dana 44 kind of looks like an apple on its side.
Jeep Dana 30 uses 5 on 4.5", same as Ford Explorer. S10 doesn't use a Dana 30, it has a GM rear axle and an IFS front. Wheel bolt pattern on S10 is not the same as the Jeep, think it's 5 on 4 3/4",...
There are three ways. 1 A dealer can normally tell from the vin number. 2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement info. 3 You can count...