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Posted by Mike Hernke [63.151.218.18] on Tuesday, August 07, 2012 at 13:39:49 :
In Reply to: Then would it be wise... posted by Dana [216.81.94.69] on Tuesday, August 07, 2012 at 10:32:36 :
5.83 gears X 1.96 low range X 6.68 Granny gear ( I am not sure about the trany but the later 435 uses 6.68 and I think the 420 was at least similiar) X approximately 200 ft-lbs engine torque = 15,266 ft-lbs torque at axle shafts / 2 wheels is about 7500 ft-lbs. Of course there is some torque going to the front but my truck was on the bump stops in the rear so I am betting not much. I found a web site claiming a 1.37" axle shaft of 1040 steel with a yield torque of 6828 ft-lbs, with 4340 this become 11,211. I would bet PW axles to be closer to 1040 and they are also course spline so the more you can divide the power with the front axle the less likely you are to have an axle failure. I don't recall anyone at the PW rally breaking traction before they ran out of engine power, however no one broke an axle shaft either. If you aren't trailering a spare is not a bad idea.
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