VCCA Home Forums TECHNICAL - 1945 AND NEWER 1946-1948 Rebuilding Transmission mount

Been busy the last days installing new engine and transmission mounts in my 48 Fleetmaster 4 door sedan.
Removing the transmission mount it seams to be one normally fitted to previous year models.

http://s875.photobucket.com/user/Ji...ount_zpskmo09gvw.jpg.html?sort=3&o=1

I ordered a repair kit from one of the known vendors that is good for 41 to 48 cars but it came without fitting instructions.
If it was the later type mount the repair should be straight forward but with this mount seams to be more than one way to proceed.
Has anyone done this repair before??
The question is : should I install the new rubbers with the new metal top plate on top or should I keep the original metal plate and fit it on top of the new one? and if doing so should I remove only enough old rubber so the new plate and rubber can be just fitted in??

http://s875.photobucket.com/user/Ji...0set_zpspj5c6omu.jpg.html?sort=3&o=0

Or is there another way???

Jianis

Hi Jiainis,

I would try to replace the entire mount with the correct one. My rational is that the design of yours is specific to a certain year and lacks the ability to be adjusted as you mount the transmission and rest of the drive train. You will see in my pictures that the bolt holes are oval allowing for slight adjustments. I am also suspicious of the height of your mount which could cause a problem at the speeds you want to drive your car!!! Does it matter if your transmission sits a quarter of an inch or more higher? Are your rear motor mounts able to adjust to this extra height?

When I have replaced my transmission or engine I have kept the bolts loose that anchor the transmission. I let the transmission find its own centering point before tightening up the bolts.

The new rubber pieces are installed in my mount with one piece sandwiched between the top plate and the other under the mount held in place by the thin metal cover that comes with the kit.

I can sell you the mount in the picture. I am traveling so can not put it in the mail until next Friday/Saturday.

Good wishes, Mike

P.S. German ingenuity could be used to redesign the mount by filling in the top plate of the mount with welded plugs??

After looking more carefully at your mount I see that the rubber area is where your mount can be adjusted to center the transmission. To me this means all the rubber is absorbing the different drivetrain alignments and movements. My mount puts almost no torque on the rubber component, and removes them from having a substantial impact on any movement in the drivetrain???

Would others please comment on my perceived interpretation of the differences in these two mounts. Jianis will want to drive his car at expressway (autobahn) speeds. Was his mount designed for this???

Mike

I am interested on your transmission mount so I will contact you shortly as I need some more small items that you might have for sale.
The mount that I got out of the 48 is installed since the car came from the factory ( General Motors assembly factory in Belgium ).
From an internet search it seams this mount was used in all cars until a new one came for the 48 model.
Having a closer look this older mount is actually over-engineered in relation to the new one.
The 2 bolts holding the transmission to the mount (7/16) are *free* to float in 2 bushings of 5/8 internal diameter giving them 3/16 free play. Also the top plate has 2 oval holes giving 1/4 play for forward and backward movement and 1/8 sideways.
I need to use the car this weekend so I will use 2 thin metal plates to cover the openings so the loads will be equally distributed over all the rubber area.This will make the mount 1/16 higher witch should not be a problem for the rear engine mounts.
AS you mention later I can weld new metal as needed and save it for my other project 48 chevy.

Jianis

Waiting for a proper 1948 mount I temporary installed my old transmission mount with the help of the 2 rubbers in the repair kit and 3 thin metal plates I made by myself.
The repair kit is sold for all 34 to 48 cars but as it proved it might only work for the 48 mount. For the kit to work properly on the older mount 4 different metal plates have to be trimmed to size and welded on the older mount parts then 2 new holes have to be drilled for the bolts holding the transmission etc.
It is not difficult to do but takes time and the right tools.

Jianis

Hi Jianis,

Saw this on ebay today. Sorry I could not post this as a link to a web site. Computer problems!!! New one like yours for $40.00.

Good luck, Mike

http://www.ebay.com/itm/1940-1941-1942-1946-1947-1948-Chevrolet-car-transmission-mount-/252113053531?hash=item3ab31be75b:g:zrEAAOSwFnFWETZt&vxp=mtr