With 235/75-15 tires, and 3.55s
65=2685 in Direct ......
should be fine, but she'll be using a lotta throttle.....
So make sure the cooling system is up to snuff.
You might have to slow down, but if you drive too slow, you might get out of the torque-zone, ie, 50mph is only 2065, but 50 in Second is 3440 ....... so you probably don't want to cruise there, lol.
I would probably put some fresh fluid in the trans tho, and maybe also in the rear. Kindof it depends on how old the current fluids are.
Put lotsa air in all the tires and bring along spares, plus water, and engine oil cuz that slanty is gunna be working ..... and when mine works it tends to use oil.