With 3.55,s and the tall tire,your gears will be more around low 3.??.If screaming on the hwy?sounds like it,s time to have your tranny checked for slippage.Mine screams with 255/60/15,s and 4.10,s,60mph@3500rpm.
I honestly don't know but I had the tranny completely rebuild before installing it and a B&M shift kit put in. It pulls out great and shifts through the gears fine but like I mentioned at 50 or 60 it feels like it needs another gear.