The Stovebolt Site Forums The Shop Area Engine Shop Rear engine mounts

54 gmc Canadian ,same as 54 chev ,has the 235 .Anyone change the rear mounts .I took mine off to replace today and noticed the old ones have plates embedded in the rubber were the new ones don’t . I can cut the metal off and put on the new ones but wanted to see if anyone else noticed this on there trucks.Kevin

Theses are the horseshoe looking mounts and there is a thick metal plate on the horseshoe piece the plates I am referring to are on the inside of the horseshoe and on the outer piece there is a flat piece of metal almost like a big washer .

The mounts are one piece rubber vulcanized to steel, so what you describing doesn’t seem correct here is what they should look like.

https://www.classicparts.com/images/79-105.jpg

Mine look like this and the metal pieces that I took off the old ones the new ones are identical except for the pieces shown. The truck has a 4 speed that is different i believe from a 3 speed.

Hy Phak1 and guys, the mounts you pictured are for trucks built up to 1953, in 1954 the engine rear crossmember and bellhousing were redesigned and they used a totally different upper rear engine mount which is a horseshoe shaped mount which lays on top of the crossmember. This new mount is a two piece design which has a smaller rubber insulator underneath the crossmember, the whole assembly is held in place with a through bolt which threads into the bellhousing, hope that clarifies.

If the lower pad does not have the metal imbedded in it then it is not made correctly. The metal is important because it supports the retainer that keeps the bolt from becoming loose and falling out. I have personally seen this happen. Nothing good comes from that. All of the 54-59 trucks that I have owned or worked on used the same mounts for both 3 and 4 speed applications.
Fred

The lower pad I can use the metal from the old one ,I cut them off the horse shoe piece has a metal piece on the inside that I don’t think will slide over .it does have the outer metal piece as well as a collar .any thoughts on he inner piece .

I would think there is a reason why the rubber-like material is attached to the metal rather than sandwich it in.
I really don't know.

Parts history:
Rear upper mount 3705444 > 3763761 > dead ends in 1963. No longer made. 1969 book says to use 3705444 which is weird.
Rear lower mount 3705447 > 3789949 > 14009321

Steele Rubber Products. They do engine mount service — revulcanization. You provide metal parts.

The Asian parts companies cross-references 3763761 to PARTS MASTER 2107, which I think is not the part with metal.

also:

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=1014492

Thanks guys I am going to clean up the metal parts a little more and see if I can get them fitting together looks like that’s the way they we’re meant to be .Kevin

One of the main components which I don't see in your photos is the retainer. It is formed to hold onto the side of the metal plate on the bottom of the lower pad and has tabs that are bent over the head of the bolts to prevent them from working out.
In the situation I referenced, the bolt retainers were not installed and one of the bolts fell out and the engine moved which put the fan into the radiator. The replacement mounts should include the metal that was used in the original mounts.
All of the components are required to make these mounts functional: Upper pad, lower pad, sleeve, retainer, and bolt.
Fred