1963 coupe body mount cushions

[Frank D.]

Seems everybody has these rubber cushions as part of a mount "kit", which I don't want, are they available separately ?
LICS doesn't seem to list them and Doc Rebuild's site is down (and will be for a while apparently. Don't see them on GM Parts Direct either.

AIM part no: 3832539..

AND, can they be changed with the body on the car ?

[Michael M.]

Re: 1963 coupe body mount cushions

IMG_1466.jpgNot sure if the part number changed from the AIM. I have two NOS GM #3842914 GR. 9.023 cushions. Yes, the mounts can be changed with the body still on the chassis.

[Frank D.]

Re: 1963 coupe body mount cushions

Some research on that "other" forum indicate the 64 and up cushions are different..
Can someone confirm these later ones will work on a 63 ?

[Frank D.]

Re: 1963 coupe body mount cushions

Just to close this out Corvette Central part no 182006 63/64 Inner Body Mount Kit contains the cushions and new hardware and it worked just fine.
One caveat tho - the bolts that showed up in the kit do not match the picture, the ones I got do not have the pointed ends as shown (which is what my originals have). They are cut straight across the end and are a giveaway that they're repros IMO.

Sooooo, I reconditioned the original bolts and used them..

[Harry S.]

Re: 1963 coupe body mount cushions

Just exchanged emails with CC, the do not sell the cushions separately.

[Frank D.]

Re: 1963 coupe body mount cushions

Just exchanged emails with CC, the do not sell the cushions separately.

I couldn't find anybody that sells them separately; normally I would check with Dr. Rebuild but he has suspended his business temporarily...
There are members here with NOS 64 cushions and some on eBay - the eBay sellers want about the same as the kit above for both though...

[Michael M.]

Re: 1963 coupe body mount cushions

Frank, the picture of the body mount cushions in your photo look like they are polyurethane. Maybe it is just a bad picture.

[Harry S.]

Re: 1963 coupe body mount cushions

3842914, the part in the bag is too small to use as a replacement. Just eyeing them it look like the outside diameter is .75 inches too short.

[Michael M.]

Re: 1963 coupe body mount cushions

As per Joe Lucia, the number 3 and 4 body mounts on mid years use a two part cushion. For the number 3 position, the GM #3842914 is used on the upper part of the "sandwiched" assembly (above the body) and the GM #3842913 is used lower (below the body). For the number 4 position, the cushion installation is reversed. The GM #3842914 is a one piece part, manufactured entirely of an elastomer. The GM #3842913 is a two part assembly consisting of an elastomer and an "integral" steel reinforcing "washer". I hope this helps.

[Frank D.]

Re: 1963 coupe body mount cushions

Frank, the picture of the body mount cushions in your photo look like they are polyurethane. Maybe it is just a bad picture.

They aren't; they're positively rubber...and here is one installed..
The cushions distend outward as the bolt is tightened...and get distinct bulges...
Can't say on later cars but my 63 had the bolt, lock washer, and flat washer in the interior, then the cushion, the big flat washer and shims (my car had none) just above the captured nut in the body mount on the underside....as per the AIM.

[Duke W.]

Re: 1963 coupe body mount cushions

Technically these are not body mounts. The purpose they serve is to tie the seat belt mounting gusset plate to the frame, but interestingly there is no similar reinforcement on the outside seat belt gusset plate. The belt is just bolted to the gusset plate that's riveted to the fiberglass floor pan. In later years both sides received cable reinforcements to the frame, so the '63 setup was a unique to that model year.

Crash testing of vehicles to verify the integrity of the seat belt system did not go into effect until (I think) the '68 model year.

Duke

[Frank D.]

Re: 1963 coupe body mount cushions

Technically these are not body mounts. The purpose they serve is to tie the seat belt mounting gusset plate to the frame, but interestingly there is no similar reinforcement on the outside seat belt gusset plate. The belt is just bolted to the gusset plate that's riveted to the fiberglass floor pan. In later years both sides received cable reinforcements to the frame, so the '63 setup was a unique to that model year.

Crash testing of vehicles to verify the integrity of the seat belt system did not go into effect until (I think) the '68 model year.

Duke

You said that before but that is how they are referred to and now, after replacing mine, they clearly support the inner body structure and not just the seat belts..IMO. If they were missing the body could sag at those points regardless of the seat belts, and, the fact there is no similar tie in for the outboard mounts gives credence to that... (again IMO) These inner cushions can also be shimmed and aren't "hardpoints" for seat belt security.

I had to take a pry bar and lever the body up enough to get the new cushions in and it was a near thing...not that it really matters, if you want the car original then they're needed...

In 63, they also thought the cargo area needed support and hence the 63-only rectangular rubber crossmember cushions.

[Alan D.]

Re: 1963 coupe body mount cushions

And do not forget to put tape around it before install!

[Frank D.]

Re: 1963 coupe body mount cushions

And do not forget to put tape around it before install!

The round cushions took a healthy does of spray silicone in addition to levering the bracket to get them slid into place...

[John F.]

Re: 1963 coupe body mount cushions

And do not forget to put tape around it before install!

What does this mean? I have never done it or scene it before.