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[/quote my 51 dump's tare wt is 7300 lbs. its gross is 16,000lbs just as yours is. [/quote]
i just assumed it was a 6400 based on your pics. so much for that i couldnt match your vin # here http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsmA3.htm
is that the info on the door tag? it also looks like the 4400 rated at 11000lbs or less didnt come with a hydravac. if it were mine id put one on. the next best thing i added to my 40 was a hydravac. i pull a camper with it and it makes braking easier. the link also should be everything you need to learn about and work on your truck.