There is about 1/2 a mile of sand to climb below the pass. There is something like a trail meandering up the slope. If I were to do it again I would stay to the right side of the "gully" and try to climb on the easy class 2-3 rock to the pass. Or climb the south face from Monarch Lake, which I hear has less sand.
Don't know if this is still occuring, but in the 80's, marmots were eating fan belts and radiator hoses in cars parked at the trailheads in the MK valley. The Silver City store even sold emergency fan belts. A trick I was told about was to put mothballs under the car, and this would keep the marmots away. Might check with the rangers if this is still going on.