Are any of those vehicles you mentioned Rob, powered from the rear? Or are they all front drive like the M109? The marines at Camp Pendleton were working on a few different self propelled guns so it is very possible it came from a different version than the M109...as long as they are all powered from the front and David has it nailed on the rotation of the T-55/55/62 final drive input...this thing is feasible...
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