I'v got a 92 4runner and I was looking into putting a solid front axel in it. I found one. Just need to know if there is any kind of marking to tell what year it is? And also wanted to know how hard it is to convert it? And possibly how to convert it???

 

84-85 gusset goes past the spring perch, 83 and older does not.

 

Look into the offroad tech section

 

here:
https://www.yotatech.com/forums/f152/

you should be able to find all the info you need there