Hi Mark,
I can't help with your GMC (I have Chevy's) specific questions but can help
in general. I believe the correct GVW is 19,000#, the 32,000 number should
be the GCW (Gross Combined Weight).
The shop manual you bought will be close for needed mechanical info, but
changes were made between 55 and 57.
You should plan on replacing 100% of the brake system including the lines,
the lines will rust from the inside out. New parts are still available from
your local BIG truck parts house. I recently did my brakes on my 2-1/2 ton
Chevy and was able to get a rebuilt Hydrovac, new wheel cylinders, had my
shoes relined, got all new return springs, new rubber hoses, had the drums
turned and I made all of the new steel lines. She might not be pretty but
she sure can stop!
As for your tires, why don't you look for a set of 9.00 x 22.5 one piece Bud
rims. They should have been optional on your truck and are tubeless. They
also allow you to run Radials. The 22.5" tires are the same height as the
20" tires so they should fit your wheel openings. I have them on my truck
which you can see on Wayne Osborne's site www.chevytrucks.org/user/wayne/
click on "Chevy Showcase" on left side then '56 and look for my Wrecker.
The fenders are the same as the Chevy 1-1/2 & 2 ton trucks 55-2 thru 57, as
far as I know.
If after you get the shop manual you still need help with the brake bleeding
procedure let me know.
Good Luck!
Mike Boteler
'56 8400 Wrecker
'56 4400 Stake Bed
'57 6400 Stake Bed
Hughesville, Maryland
----- Original Message -----
From: "Bookout, Mark E." <markb@umr.edu>
To: <oletrucks@autox.team.net>
Sent: Wednesday, February 14, 2001 11:55 AM
Subject: [oletrucks] New guy. Old Truck. Long post. Massive Confusion:-)
> Here's my first post to oletrucks, and let me say right up front, THANKS
for
> your patience.
>
> I bought this truck (http://www.umr.edu/~markb/thetruck caution, BIG
images)
> from a co-worker. I need this truck to haul gravel and mulch for me, and
> the price was certainly right!
>
> I bounced around the net for the last couple weeks trying to get some idea
> of what I have, and eventually stumbled onto http://www.laroke.com and the
> tales of billybob. An excellent site, by the way! (Are you there,
> Larry?:-) Therein was the link to this mailing list and it's archives,
and
> I've been poking around in the archives since then trying to see what I
> could find. I finally decided to ask you guys directly.
>
> Anyway, I have questions in 3 areas: VIN/ID, Brakes, and tech manuals.
>
> First the VIN issue.
>
> The truck's data plate has this number: 374 PT 1073. I _think_ I
> understand that this means the truck is a 3?? series, made in Pontiac MI,
> and in 1957, with a production sequence number of 1073. I have NO IDEA
what
> that 74 means in the 374 part. Anyone? Anyone?:-)
>
> Sooo... I bought this book (but haven't seen it yet):
>
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?MfcISAPICommand=ViewItem&item=14094
> 97184
>
> According to the pictures I've seen on the web, this is a 350 series
truck,
> not an LCF style. Question is... what _exactly_ do I have? (and what IS a
> 350 series truck?) I've been getting the odd parts here and there (see the
> brakes question) by referring to it as a "57 GMC 2-ton". The data plate
> referrs to a max vehicle weight of 19000 pounds, and a gross load of 32000
> pounds. Seems like a lot more than 4000 pounds of payload with those
> numbers!
>
> Second, the brakes.
> This truck has no functioning brakes, and hasn't for 4 years at least. I
> pulled and rebuilt the master cylinder, found a nail plugging one of the
> brake lines, took it out, found a leak, put the nail back, got the parts,
> rebuilt one slave cylinder, but couldn't get all the air out of the
system,
> and so pulled the hydrovac off (but not apart). Turns out that some folks
> who have been down this road before had trouble bleeding the hydrovac too,
> so I'm going to say it's good and put it back on and try the bleeding
thing
> again. Here's the question: Any tips on bleeding the hydrovac? Other
than
> patience, I mean. I think I've figured out that one:-)
>
> Third and final issue in this post: Tech manuals. Is the manual I got I
> got on ebay what I need for this truck? It says it's for 100-500 series
> trucks. Does that include the x50 series too?
>
> Bonus Question: The tires were shot, and the truck had center split rims,
> so, on the advice of a couple of local truck/bus people, I traded my
> tires/rims for rims off a 2 1/2 ton military truck. These rims take 9x20
> tires (bus tires). Trouble is, the rim is just about 1/4 inch too wide to
> clear the steering knuckle on the front hub assy. Can I make a spacer and
> put behind there and not have trouble?
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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