I have two pdfs giving ratings , one dated 2014 so no use and this undated giving the 1650 as torque spec .
So this could be the reason your Cat is tuned for that torque . Best info would come from Allison linked to your trans serial number .
But JMHO: Not looking good.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.