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The model no. is 38035.
If one side of the auger spins freely, is that caused by a broken shear pin? Also, if the other side is unmovable except for a very slight forward and backward movement; has the transfer case/auger seized on that side? Are the augers on this model designed to rotate when not engaged? Also, how do I get you a picture if needed?
I did go and look very carefully at the augers and yes, one of the bolts on the outside of one of the augers is missing. I had to remove 2 bolts on the outside of the casing holding the augers in order for me to see the bolts. I then went and tried removing the existing bolt from the good side so I could get a replacement. I had to knock the good one out with a long metal rod but it did come out. I then went to my local hardware store and purchased 2 replacement bolts and nuts. The good bolt a 7/16ths I used as a reference was pretty beat up and the nut was a nylock so I will replace both sides. Its going to be quite interesting to see if I can gain access to slip the bolts back in because they are located 90 degrees from one another on the axle of the augers. I'll let you know how I do. I might want to wait for the weekend before tackling this because I'm doing all this at night in my garage; my uninsulated garage. It was -4 last night!