55.2-59 Radiator support swap.

[jmlloar]

On to my next step.
got my frame preped and mounts installed.
now in order to save fab time and parts availability, I am using the 55 to 57 chevy rad support and radiator in my 55 gmc project.
Anyone know what else needs to be changed? I know this is basically what the Canadian gmc came with. along with the chevy engine.
I'm keeping the gmc hood and mustache.
I know 57 chevy fenders are same as the 55-57 gmc except for the emblem holes.
And my hood is same as the 55 and 56 chevy with the additional hole for the hood grill.
Just looking to know what other stuff I need.

Does someone have the chevy front sheetmetal diagram? Or where can I get the chevy parts book? I have the gmc parts book.

[joedoh]

Originally Posted by jmlloar

On to my next step.
got my frame preped and mounts installed.
now in order to save fab time and parts availability, I am using the 55 to 57 chevy rad support and radiator in my 55 gmc project.
Anyone know what else needs to be changed? I know this is basically what the Canadian gmc came with. along with the chevy engine.
I'm keeping the gmc hood and mustache.
I know 57 chevy fenders are same as the 55-57 gmc except for the emblem holes.
And my hood is same as the 55 and 56 chevy with the additional hole for the hood grill.
Just looking to know what other stuff I need.

Does someone have the chevy front sheetmetal diagram? Or where can I get the chevy parts book? I have the gmc parts book.

i think this came up before on here i will try to find the thread (it may have even been your question!) but I believe the 55.2 gmc used the 47-55.1 core support hoop and two-bolt to center frame mounting of the 47-55.1, the picture is burned in my memory.

whether it still had the same wider/frame end mounting of the chevies on there, I dont remember, but it seems to me if it were mine I would just hang it and see what i needed to make. I will try to find the picture I am talking about, maybe the frame ends will show you.

[jmlloar]

the support on the gmc looks similar to the 47 to 55.1 but all the little stuff is definitely different.
Some of my gmc only stuff is shot, so I will just go with the chevy support.
The chevy radiator is half the price of the gmc one.
and to use the gmc one I would have to remove the 1980 front cross brace and fab a custom one up. since the chevy support sits on top of frame rails it clears fine with no mods.

Radiator support is mounted now so I just need a few of the other stuff.

[57tailgater]

Spun it around for you.

[NWA58]

Originally Posted by jmlloar

the support on the gmc looks similar to the 47 to 55.1 but all the little stuff is definitely different.
Some of my gmc only stuff is shot, so I will just go with the chevy support.
The chevy radiator is half the price of the gmc one.
and to use the gmc one I would have to remove the 1980 front cross brace and fab a custom one up. since the chevy support sits on top of frame rails it clears fine with no mods.

Radiator support is mounted now so I just need a few of the other stuff.

Mine is a 58 but it came new from GMC with the V8 option and it used the same rad support as Chevy. When TCI made my chassis from a 1957 jig they had used before, they put an extra/unnecessary crossmember that dips down for the GMC 6 and taller radiator. My original V8 rad support is shown over the lower crossmember same as yours. No harm in extra strength. Yes, fenders are the same except for emblem holes. Upon disassembly I found a Chevy fender on my left side with the Chevy holes filled and GMC holes drilled.

[jmlloar]

The 58/59 already uses mostly chevy parts including the chevy radiator support and chevy hood. (sounds like they used a 55 to 57 gmc front crossmember on yours, the 58 59 frame would also be slightly longer where the bumper attached)

My problem is: the 55 to 57 usa made gmc uses gmc only front end components (only the fenders from 57 chevy are the same as 55 to 57 gmc and inner fenders) and the 55 to 57 chevy uses chevy only front end components and the Canadian GMC is a hybrid of the two. I need to know what pieces are needed to combine the gmc grill to the chevy radiator support. Is it a simple "use this from chevy and this from gmc" or does the Canadian GMC have some parts that are Canadian gmc only?

[jmlloar]

The 58/59 already uses mostly chevy parts including the chevy radiator support and chevy hood.

My problem is: the 55 to 57 usa made gmc uses gmc only front end components (only the fenders from 57 chevy are the same as 55 to 57 gmc and inner fenders) and the 55 to 57 chevy uses chevy only front end components and the Canadian GMC is a hybrid of the two. I need to know what pieces are needed to combine the gmc grill to the chevy radiator support. Is it a simple "use this from chevy and this from gmc" or does the Canadian GMC have some parts that are Canadian gmc only?

I already have the support and radiator mounted and the chevy hood latch panel although it looks like I might need to use the gmc latch panel.

[dsraven]

my Canadian 57 gmc has a chevy rad support
front fenders also have a dimple in the front around the grille hole where the mustache ends bolt on
hood latch is a little different as well. nothing you can't figure out. I am going to use the latch system off a newer truck with a cable release anyway

[jmlloar]

Originally Posted by dsraven

my Canadian 57 gmc has a chevy rad support
front fenders also have a dimple in the front around the grille hole where the mustache ends bolt on
hood latch is a little different as well. nothing you can't figure out. I am going to use the latch system off a newer truck with a cable release anyway

The dimple used on 57 chevy grill is the same one on 55 to 57 gmc. Thinking the side fender emblem holes are different.

On hood latch, since hood interchange as a bolt on swap, I would figure all that I would need is the latch support. the latch itself is another question.
Probably a lower valance from 55 56 chevy.
Thats why I was hoping for a parts diagram of the chevy front sheetmetal. Then I could see all the little stuff and where they go.

[jmlloar]

Originally Posted by dsraven

my Canadian 57 gmc has a chevy rad support
front fenders also have a dimple in the front around the grille hole where the mustache ends bolt on
hood latch is a little different as well. nothing you can't figure out. I am going to use the latch system off a newer truck with a cable release anyway

but what pieces are gmc and what pieces are chevy to get the mustache to work?

[dsraven]

try this for a free download. it shows how the chevy front end goes together, as well as the whole rest of the truck.

https://www.google.com/url?sa=t&sour...hgNerbXG4oM_J-

[jmlloar]

Exactly what I needed.
Thanks

[jmlloar]

rad installed, had to remove frame brace anyway. support clears it but rad does not. Will fab something up under the support to strengthen the frame.

[jmlloar]

anyone have a 5.3 installed to compare where the waterpump sets. As is looks like engine will have to move back an inch or 2.

[daveshilling]

Originally Posted by jmlloar

anyone have a 5.3 installed to compare where the waterpump sets. As is looks like engine will have to move back an inch or 2.

If you have the inch or two to give, then that's always ideal to move that engine weight further behind your front wheels..as far and as low as your build allows!

Your fan brackets make this more difficult, but if you can lower your radiator by drilling new mounting holes, you can move the water pump snout away from the center of the fan and gain clearance that way.

[dsraven]

Good idea. A bolt on would work.
How much space between the fan and engine now?

[dsraven]

Moving engine back is likely what will work best but it might also be into your firewall. I had a new Chevy rad support for mine but ended up giving it to another enthusiast and built my own. I built it to allow the rad to sit forward through the rad support which allows for more space between engine and rad. A set of dual electric fans may also help your space issue as the motors for the fans wouldn't be in the same space as the water pump shaft possibly

[dsraven]

kinda sounds like mine was but it ran and drove. actually, it started with a boost at -30C and drove up onto the Uhaul trailer---no brakes but it drove up there. lol.
the 57 is unique to thay year in that the opening for the grill-chev or gmc-is a little biggert than the previous years. the gmc mustache bolts on across the top and then the fenders have a small indent in them where the side pieces bolt on and wrap around the sides and they cover the holes where the chevy signal light would go. I have the stuff but the truck is buried behind several projects and the grille and mustache parts are in boxes someplace otherwise I would take some pics and send you in an email.

[dsraven]

do you have the factory assembly manual? it is great for dimensional drawings so you get the mounts etc all in the correct places.
my floor and sides were rusted up to the lower hinge pockets. I usedthe firewall and floor from the frame donor vehicle, a gmc envoy.

[jmlloar]

I have the chevy assembly manual, and the gmc parts manual. but would like to find chevy parts manual. also cant find any info on the Canadian gmc parts. the Canadian model gmc is basically what I need as far as front end parts since they were chevy's with gmc hood and grill and still used the chevy support.

[dsraven]

mine is a 57 so a different grille set up than the 55. not surw about the hood latch etc.
are you stumped on something particular? maybe I can give a little insight if I know what the particular question is.
like I mentioned, the 57 fenders are slightly different as to how the grille opening fits the grille surround parts. the gmc has a dimple in the grille surround area of the fender where the mustache part fits as well. I have a pic of that somewhere. it would be something you could probably make work if you come accross a set of chevy fenders for cheap. there is also a hole in the fender around the side where the end of the mustache bolts on as well. if you are buying new fenders get the gmc ones and they should work

[jmlloar]

I still think the 57 chevy fenders should be what I need. they have the same dimple that gmc uses. Would have to double check but iirc 55 to 57 gmc use the same fenders. if something is different on the 57 its grill specific. The gmc fenders even have the chevy light holes in them under the mustache trim. The big question is mounting the center mustache piece to filler panel. Doubt there is any difference on the way latch sets either since 55 and 56 hood is bolt on swap with 57.

Keep in mind I am talking gmc and have not done much research on chevy of same years. Thats what I'm trying to do now.

[jmlloar]

Originally Posted by dsraven

if you are buying new fenders get the gmc ones and they should work

never seen gmc specific fenders listed anywhere.

[jmlloar]

engine moved back 1 inch

[dsraven]

here are a couple pics showing the GMC fender and the Chevy fender, both for 57 I believe as they were on my truck when I got it. the mustache obviously didn't fit properly with the chevy fender because it didn't have the bump on the grill opening