[quote flu]Oh… And I did manage to strip/flatten the bolt-outs slightly too.. So they go back to Sears, along with the impact wrench, that didn’t do jack to remove the crank nut too.[/quote]
I have had good luck with the “Husky” high torque 1/2 inch drive impact wrench (Home Depot), model H4480. http://www.homedepot.com/p/Husky-1-2-in-800-ft-lbs-Impact-Wrench-H4480/203458750
It is supposedly rated at 800 ft/lbs or so. It does take the wheel bolts off my 1 ton pickup fairly quickly (torqued to 145). I do like that you can actually limit the amount of torque applied in removing bolts (even though documentation says it doesn’t – you can actually hear, feel, see the diff in the settings when removing). I also like the obviousness of the switch for forward or reverse. The position of the switch matches the direction(in – tighten / back or out is loosen). The impact wrench is also equipped with a muffler. One important thing for impact wrenches is the supply of air and the response of the pressure regulator(pressure drop against airflow). Impact wrenches do drink from the compressor. I run mine off a 29gal Harbor Freight compressor – they actually have a good one – tank may be made in China but the compressor head seems to be Italian, motor is US on mine. http://www.harborfreight.com/air-tools/air-compressors/29-gal-2-hp-150-psi-cast-iron-vertical-air-compressor-61489.html
I checked the quality of the compressor head vs Sears, Lowes(Kobalt), HomeDepot(Husky).. etc. and preferred its design. I re-adjusted the peak pressure down a bit to reduce motor thrashing – single stage compressors start to ‘thrash’ near 140psi due to dead space in the compressor head (gap between top of piston and bottom of reed valves). Two stage compressors work better in the higher pressure ranges. NOTE: I don’t like oil-less compressors. They are noisy and beat themselves to death in a fairly short amount of time.

With air impact wrenches and air ratchets etc, don’t forget to lube them particularly when breaking them in. I start with about 2 drops of oil in the intake air port at the start of when I am using it for the day. After a while you can drop it to about one drop. I don’t use typical air-tool-oil (ie: http://www.homedepot.com/s/air%2520tool%2520oil?NCNI-5 ). I use “Triflow”, which is a light lube containing suspended Teflon.

NOTE: When using impact wrenches, make sure you are using extensions etc for impact wrenches. Don’t use the standard ratchet tools there. Impact sockets, extensions are made out of a different steel for a reason (not just heavier/thicker).