300 or 400 lbs is not tha much difference .. but too loose will enable the outer race of the bearing to spin in the housing and cause big problems. Too tight may cause unwanted preload on the side of the bearing and cause failure.
I would just do what they ask for rather then either loose a wheel or have to tak it apart a second time. The cost of the torque multiplier as compared to the damage a wheel could do or redoing it with a new axle, bearing and housing is only a little bit of money.
Check with your local Auto Shop or Tool Rental Place they may leand it or rent it to you.
Ron
Ron
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