It most certainly does have one in the PoH.
Its just a shade over 1400lbs Max tq for the climb at -4 and 18,000ft
Normal van max tq at that altitude and temp would be 1180lbs.
I'm actually pretty embarrassed that evidently I have been over-torquing steam gauge vans. I'm obviously not alone as one of the other van drivers has pointed out a few post before me.
I would love to hear the reason for the the drop in torque limit over altitude! Thanks!