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  1. 135gmc

    S-457 shelter help needed

    I found a page that shows the AC installation -
  2. 135gmc

    S-457 shelter help needed

    The S-457 was used for the AN/TRR-33 telephone & radio monitoring station. It had an air conditioner installed through the curb side - the AC was usually a 6000 BUT AC with a built in electric heater. Most of the ACs were built by three suppliers, but they were all identical. Hollingsworth built...
  3. 135gmc

    GMC 211 engine and auto trans boost and smooth

    Good luck finding a new muffler - the only source I think might have any is Alfa Heaven, in WI. I don't think any of the other surplus dealers have any left. A friend of mine was working on an M221 (2 1/2 ton semi-tractor), and wound up modifying an off the shelf truck muffler by moving the...
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