Just get a dana 44 it will bolt right in and you will have the right gear ratio and it won't be a 10 bolt you can probably pick one up for about $200.

The S10 10 bolts are 5 lug probably have diffrent spring and shock mounts.

So I think the Dana 44 is a Cheaper and more reliable option.

94 Rodeo 3+3 lift Red)
95.5 Rodeo 1" Body lift Dana 44' front & rear 4.88 gears 35"s 176,000 miles Optima Yellow top InexAir Co2
front winch bumper custom rear bumper, Hella 500's
2004 Silverado duramax