The Stovebolt Site Forums The Shop Area Paint and Body Shop 1948 Cab Mounts

Our 1948, 3100 series truck, has a center cab support for which we’ve been not able to find a breakdown that shows the detail parts. Therefore we’ve not been able to purchase detail overhaul parts. The 1947-1954 Service Manual shows it but the GM parts catalog does not show it. All we can find are left and right shackles that were place into production after 1948.
Any help is appreciated

If you have the metal parts, you should be able to find replacement rubber bushings. Try Energy Suspension. They make polyurethane bushing, and I believe you can search for them by diameter, length, etc.

Thanks for the suggestion. I’ll use your link for that company

Carl, are these measurements applicable to 1948 ½ ton 3100 also?

(Carl's' Post was in a question about 1950 cab mounts)

'48 3100s have a completely different cab mounting design. I could find no specs for clearances. My take away from this is that the rear mounting system is not adjustable. The weight of the cab sits on two rubber bumpers located at the very outside of the single point rear mount assembly.

Thank you 52Carl. Guess that also that fifth tear centerline support is factor.
By the way in the past I posted request for detail parts of that fifth support and haven’t seen any responses. Any ideas?

Texas - After seeing your reply post in Rick Brown's thread on front fenders you mentioned you were still looking for info on this rear center cab mount for your '48.

I guess you didn't have any luck getting info from the source Kevin suggested???

Anyhow, I did some digging through the 1948-51 Shop Manual and a 1929-48 Chevrolet Master Parts Catalog and here's what I found.

The 1st pic below is from the 1948-51 Shop Manual HERE. It shows the location and most details about that rear mount. If you read the mount removal and repair instructions in the manual, it indicates the mount has replaceable rubber "bushings" at the pivot point. It describes in fairly good detail how to remove, disassemble, replace the bushings and reinstall the unit.

The 2nd picture shows the 1948 Chevy Master Parts Book details on the truck "cab mount" components. The last item listed GM# 3660540 are the 2 bushings that are used for the center pivot on your rear cab mount. Turns out they are exactly the same bushings as used for the rear spring shackle bushings and are readily available as reproductions from Chev's of the 40's and can even be found NOS on ebay.

Does this cover what you need to know on your rear cab mount, or is there more???

Texas check your original thread on your rear cab mount question. I just posted info that should help you out and not sidetrack Rick's thread any further.

Back to Ricks 1950 truck topic.

Gdads51, I’m happy you researched this for me and your item 2 details points to what’ve been looking for. As item 1 since I have that manual I knew that much. For sure I’ll search for those bushing and replace them as soon as can obtain them. Man I’ve been for years for a source that could point me to them. Thank you, thank you, thank you.

Glad to be of help and looking forward to your after action report on how the mount rebuild goes. Don't forget to post some pictures as they can help others that may have this repair need crop up in the future.

Thanks to all. Attached is photo 8682.jpge shows the grill to bumper horizontal alignment issue. Photo 8701.jpeg show significant horizontally leveled (95% improvement) after lifting the front passenger cab and adding a thicker rubber isolator locally mfg from an old truck / tractor tire tread area ref photo 8705.jpeg. The tire used tread was one i found on the side of the road on the way to my son's house.
I'm very happy with the results but I still intend to shape the bumper to grill skirt.

Glad to see you've had success getting your alignment issue looking good. Great use for a piece of a tire carcass!

Did you get that rear cab mount rebuilt???

Gdads51, I’ve not worked on the center cab bushings replacement. I need to order them and schedule that task