Air Impact Wrench for Pinion Nut?

[Kevin Trent <trentkc@domain.elided>]

I've got a really stuck pinion nut on the rear axle of my 115 LSD.  I need 
to replace the seal, but cannot get the nut to budge with a large 1/2 drive 
ratchet.  I made the special tool (ring nut socket) per the excellent 
article on the St Louis Club web page:

http://www.geocities.com/motorcity/downs/3837/ringtool.html


I'm considering the purchase of an air impact wrench.  This type of air 
tool is offered with a wide variety of specifications and prices.  The most 
expensive impact wrenches have a up to 450 to 500 ft.lbs. of torque, while 
the low price versions are rated at 200-250 ft. lbs. of torque.

My question:  How much "power" do I need to loosen that pesky pinion nut at 
the differential?

Thanks,  //KCT, Powell TN 
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