A 6000 series Spicer auxiliary is rated nominally for an engine max torque (at flywheel) of 600 lbft.
350 lbft is not much at all.
The torque is a "paper" estimate based on components installed. 350 should be minimum, so a 5000 series would be good for me too. Is yours a 4 speed then ? What is the extra gear ? Another reduction ?
Got any spares ?? I don't need a shifter as I would plan to leave it in OD.
