Where can I get the rubber support that bolts onto the bottom of the trans tail piece? I looked in several aftermarket books, but haven't seen one yet (or maybe I didn't look in the right section). Mine fell apart when I put my trans back in. Any suggestions appreciated.
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Re: 69 rubber trans support
It's called the rear motor mount. If you don't need a reproduction or GM original, any auto parts store will have it. - Dave -
No wonder I couldn't find it!
This is the most challenging part of trying to fix a Vette which is an antique - trying to find something that I don't even know the name of!
Thanks.Comment
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Re: 69 rubber trans support
Bob-----
Strange that you should bring up this particular part; I was going to post some information on it today. This particular part has been, since 1968, GM #3913498. As of recently, it carried a GM list price of about $37. I have several of these in my collection, but, as part of my currently underway engine project, I decided to order another one.
Well, it seems that GM #3913498 has been very recently discontinued and replaced by GM #22188495. When I received this part I found it to be IDENTICAL to the earlier part, so that's good. What did change, though, was the price. This part carries a GM list price of $129.30! I didn't pay that much, but even at my price the cost was $86.25.
Now, I will say that the GM parts are usually always the best and I would always try to use them. This is especially true for engine/transmission mounts. Many of the aftermarket variety are "foreign" manufactured and are structurally different than the originals. In fact, the metal portion of the mounts is often thinner and "skimpier" steel.In Appreciation of John HinckleyComment
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GM motor mounts
Sorry to take exception to GM motor mounts, but my 66 went through 2 of them in 5-6 months back in 1989. I have used aftermarket mounts ever since - no problems - but I should qualify that: I modify the aftermarket mount for the LH (lift) side by drilling and tapping for a 3/8sae bolt riding in a 1/2 hole in the rubber. The bolt head fits into the recess of SB soft plugs. The bolt head can not be seen on either BB or SB engines (my 66 is a BB car with an SB mule motor in it). I use the bolt to limit the travel in case of failure to 1/8 inch. Even with later style mounts that have an interlock, the travel is enough to cause HOOD DAMAGE when failure occurs. I know, becase I had to buy a $1000 NOS hood. - DaveComment
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Re: GM motor mounts
Dave-----
If you have been using the non-locking style(pre-1970)motor mount all along, I'm curious as to where you would have gotten the GM-sourced mounts which failed on you, even in 1989. GM discontinued the non-locking style mounts for PRODUCTION in 1970 and for SERVICE within a short time after that. They were replaced by the locking style mount for all applications. After that time, the only non-locking GM mounts that would have been available would have been those "kicking around" in old dealer stock. In fact, for many years, most folks who have chosen to use the non-locking style mount for originality or to avoid having to modify their spark plug wire "V" shields, have had no choice but aftermarket-sourced mounts.
With respect to the motor mounts, the first locking mount was GM #3980701. Later, this was replaced by GM #6258154, which remain available to this day. I have many NOS examples of both of these and I have compared them to several "aftermarket" mounts. Based upon a simple physical comparison, most of the aftermarket mounts use thinner metal and considerably different configured metal-work than the GM pieces. In my opinion, the different configuration would make the inter-locking feature of the mount much less effective in restraining engine movement should the vulcanized rubber portion break or seperate. Also, most of the aftermarket mounts were identified on the rubber portion of the mount as having been manufactured in Korea or China. Some were not marked, at all, with respect to country of origin, but the boxes had the "tell-tale" type of printing and carboard composition often seen on "far eastern" sourced merchandise.
I am surprised that you had a problem with engine rotation when you were using the locking style mounts and they failed. The locking feature on the GM mount is very sturdy and it appears that engine movement would be limited to about 1/2" maximum, unless the metal interlock failed and bent or otherwise distorted. Did that happen?
Cranes CorvetteIn Appreciation of John HinckleyComment
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Re: GM motor mounts
Yes the GM mounts from my Cherolet dealer were service mounts with interlocks - and yes they failed - and yes the 1/2 inch lurch was magnified by the outboard overhang distance of the alternator on the 427cid390hp-AC engine and the 350cid300hp-AC mule engine that took over when I bagged the big block. The Air Conditioning was not all that common, and it does put the alternator where it can do the most damage to the hood support fiberglass - which hangs low over the alternator. - DaveComment
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