Well I am putting the ARP studs in my toy. axle this weekend. The people at FROR are awesome to deal with!
I run 35" Mickey thompson MTZs I just got the other day, pretty sweet tires....
anyway, I think the toyota axle with the steering beefed up, long fields and an ARB locker will hold up to 35's. If I ever want to run the huge tires I will need to do a dana 60 swap. My truck is still my D.D. and a 60 with 49's is leaning a bit towards the off road only type of vehicle...
But you can still do alot with locked factory type axles and 35's....