The number you quote is only a casting number for the winch brake. the only time i have seen a model number on any Garwood winches i have had it was on winch that i will bet the same as yours. it was on a brass plate riveted to the top of the of the worm wheel housing. Alas i cant remember the number nor did i ever know for sure what it came of but it was suggested it had been on a brockway bridging truck. It was classed as a 35,000 lbs the 980 DT was 25,000 lbs