Topic: '81 axle ratio?

[Speed]

On my '81 Toyota 4WD truck,is the original axle ratio stamped anywhere,or is there supposed to be a tag somewhere that tells what gearing I have? As I understand it,there was a 3.90 and a 4.10 available,but they figure out so close I can't be sure which it has.
   Speed

[emsvitil]

The data plate in the engine compartment will have an axle code....

http://www.off-road.com/trucks-4x4/tech/toyota-differential-identification-18588.html

Mine is G292  which translates into

G 8"
29 4.10
2  2 pinions


A   G072  would be    8"   3.90    2 pinions

[Speed [OP]]

   Thanks for the reply;  I'll go check it in the AM.
   Speed