If you have the 3rd member out, just count the teeth on the ring and divide by the number on the pinion. (ie. 41/10=4.10 or 40/7=5.71 etc.)

I would guess that you have a 4.10 based on the truck description, but you will have to verify it by counting.

hupptoy


99 4Runner SR5 3.4 Auto 4x4, 32" LTX A/T, 154K
93 Toy x-cab 22RE 5-spd 4x4, 31" LTX A/T, 150K