Simple method to figure out you lower rating is old diam tire/new diam tire times rear ratio. (32/35)3.73 = 3.41 effective axel ratio.
If you were stock at 31", then you are down to a 3.3 effective ratio.
I'm assuming you have a DMAX with that high of a GCWR. Being as 3.73 is the only ratio, no way to tell where you really are per say now in comparison. SWG about 88% or 26,300 +/-.
Remember gcwr is a performance/warranty rating only. Question becomes, what performance are you looking at etc. Holding 60 in DOD vs OD vs Direct at 1800 rpm......pulling an X% grade with out stalling in 1st gear.
Marty