You can juggle those numbers. back and fourth but the relationship
remains the same. What length bar with what weight applied will give you
the 360 ft lbs of torque.
Really sounds like you need a new stub axle and associated parts.
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The guy that has bringing the 360 ft pounds torque to my axles has a 36"
long Snap-On 3/4" torque wrench.
Even with me sitting in the van, emergency brakes on, my foot on the brakes
and the van in gear the 360 ft pounds he applies makes the rear wheel spin
on the loose gravel in his driveway.
It even spins in the building on his dusty floor.
I don't really think you're going to get the full 360 lbs with a two foot
cheater bar.
Just tighten the nut enough to get it firm, drop in the locking pin, spread
the pin slightly and take the van to a mechanic with the proper torque
wrench.
I've never paid more than $10.00 to get these nuts tightened properly.

Stan Wilder