If i was to say go to a junkyard and find a few 4runners there how would i be able to i.d. the gear ratios in the front and rear diff. Vin# or by looking at the diff itself? P.S. i am looking for 4.56's or 4.88's out of a runner and will they be able to replace my stock 4.10 on the 1990 4x4 without mods?

 

gear codes are going to be on the info plate in the door jamb, do a search this has been beaten to death

 

Should have the axle code next to the paint code. Should be a letter and three numbers if I am not mistaken.

 

This website will help you

http://www.brian894x4.com/Gearratiosanddiffs.html

 

thanx guys thats just what i needed to know