ford 9 inch guys

i am putting a big bearing ford 9 inch out of an f150 in and i am going to put 35 spline shafts in it, and i was wonder if i should buy an iron nodular third member or will my stock third member hold up, i am going to run a spool either way and i have seen spools made for the stock case that are 35 spline. i have a 4.0 liter and with intake exhaust, with no plans of more power, i was wondering if the stock thrid member will hold up, i am also runin 35x12.5 swampers.

thanks
zach

stock is fine. if it has the 3.25 bearings. otherwise you will need a nodular 3.25 trd.