The Stovebolt Site Forums The Shop Area Paint and Body Shop '47 Rear Cab Supports

Purchased a cab mount kit for my 3100. The original rear rubber supports are missing on my truck. From what I've found, the originals are no longer available and may have been utilized on early model ADs. The brackets on my truck were there....sorta. They are rusted. The replacements do not fit the design of the original support brackets. Plus the shape of the rubber cushion is different...not important?
My question is: if other '47 owners have a suggestion for mounting these? I'm considering a new brace underneath to mount the new rubber support to. That would have to be mounted through thr floorboard.
Anyone have experience with this? Any thoughts or suggestions?

any updates to your situation Jim? Mike

47 has a little different cab mount system: Here they are side by side: http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0102.htm
Finding bits for the early type is an adventure.

Thanks Steve,
Hunting for original rear mounts is a tough one. I've been given a couple of leads fortunately. If those prove to be a "no go" I'll have to figure out something else. I really don't have much to go by as the original mounts are gone and have one bracket that is intact. There are pictures in the forums of original mounts. That has been helpful too. Unfortunately I can't use the picture to solve my issue. 😩
I may have to improvise mounts using the new style round mounts to keep it sorta original. My other option is to investigate using the newer type mounts.
I was hoping someone who faced this issue had some suggestions as to what they tried/used/did.

My thought is that GM found over time that a FOUR point system was superior. So anything after 1948 was a 4 point mounting system. I have a 48 cab and the plan is to get all the mounting parts to change it over to a 4 point system. Of course if you are going stock only, that is excluded. You can find cabs in salvage yards with all the parts you need, or go with new vendor parts. Good luck!

How is this search for a fix going? I’m in the same boat you guys are in. My 47 AD 3100 has the original mounts but are toast. My cab was still setting on what I think may be the original rubber. The front corners are just some maybe 1/4” rubber pads. That would be easy to make. The rear of the cabs rubber stabilizer cushions are there but have separated from the metal brackets. I’m thinking of plating the inside and underside of the cab and using axle bump stops.
The center mount is still together. I have no idea for changing the rubber in that one. I’d sure like a good idea if you have one.
Second question is the front mount on the cross member. The manual shows what looks like a spring in the center of the mount bracket (K). My radiator support to cross member was setting on a small rubber cushion, no spring in the center. Am I missing something or is that just a bolt and not a spring?

A little history here, when the '47 AD trucks were released Chevrolet only thought of the system as being three points.
https://www.flickr.com/photos/advance-design_parts_co/17244736685/in/album-72157651718017649/
Later as trucks started to show front end sheet metal cracking and stress problems the mounts were re-engineered and correctly described as a 5-point system. The radiator mount truly functions as another mounting point and has been modified over model years as well.
https://www.flickr.com/photos/advance-design_parts_co/12315088635/in/album-72157640522200463/
https://www.flickr.com/photos/advance-design_parts_co/8350452080/in/album-72157632440242503/
The early parts have been out of production for years and NOS are very rare. The revised mounts are now reproduced by vendors or available often in the Swap Meet section. You will save yourself a lot of time and searching if you retrofit now, unless you are looking for a correct restoration on a 47-mid 49 it is a good set-up. None of the vendor kits are correct for the cab bumpers (originals shown below).
https://www.flickr.com/photos/advance-design_parts_co/8129470535/in/album-72157631868452754/

Kswillie,

I'm in the process of contacting guys who have yards of old metal. Brad is right, nobody seems to have any of these----used or NOS. I'd really like to honor the original type but it also has been suggested I change over to the revised supports. I'll check that out as an alternative too. Just have to determine the attaching points on the cab and frame? Restoration seems like an unrealistic Solution. May have to use newer version of support.
A question for you.....another good as gold part is the spare tire carrier for you truck. Do you have one? Hopefully you do! If so, you can sell it and be able to build a new home, buy a yacht, and build a vacation home in Tahiti!A bit of exaggeration.....but very hard to find also.

Were it Me,Chuck the orig system.
I would just buy the 2 cab floor supports and weld them in.
Get a set of rear shackle mounts from whomever,use the Kit You already have to rebuild them and bolt them up.
Last thing to do would be to Make Sure the truck is DEAD LEVEL and with the floor being at the correct clearance to the frame,push the drop leg of the bracket against the frame rail and drill the 4 holes,2 each side.
Retro,ed to a 5 point system!
regards,
steve sr.

I was going back and forth on trying to fix the 3 point mounting on my '47. Sounds like the 4 point is better, and even easier to retrofit.

After 68 years the bumpers and center shackle are usually missing or shot (anything in a wrecking yard as well). Unfortunately as I stated above these mounts are very difficult to find. I spend a lot of time searching for NOS parts for the AD series trucks and these parts are very rare. The retrofit is really pretty simple and will be a much better system over the long term, perhaps at some point one of the vendors will reproduce the correct parts but the tooling investment would probably not be justifiable.

I have a 48 truck and added shackle mounts back in the late 70's
Shackles are now sagging not up right. I going to rebuild them. My question is what is the right clearance from floor to frame?