F41 shock mount with a strange forging

[Edward B.]

Guys, I was reading THIS THREAD, and it got me curious about my shock mounts. I have a 69 with F41 so I went out and took the attached pictures. Note that the driver side has the correct 382926566 (although there's no dash between the 3829265 and the 66 like I've seen before), but the passenger side only has what appears to be 965 or 96S. Has anyone ever seen this forging on a shock mount before?

Ed

[John H.]

Re: F41 shock mount with a strange forging

Guys, I was reading THIS THREAD, and it got me curious about my shock mounts. I have a 69 with F41 so I went out and took the attached pictures. Note that the driver side has the correct 382926566 (although there's no dash between the 3829265 and the 66 like I've seen before), but the passenger side only has what appears to be 965 or 96S. Has anyone ever seen this forging on a shock mount before?

Ed

Ed -

See the third paragraph in post #3, Joe Lucia's response in that thread.

[Edward B.]

Re: F41 shock mount with a strange forging

John, you mean this one?

The F-40/F-41 shafts were GM #3829265 and 3829266. Both of these were machined from the same forging and the un-machined portion of the shaft of original shafts will show 3829265-66.

If so, I guess this means the passenger side isn't original.

Ed

[Joe L.]

Re: F41 shock mount with a strange forging

John, you mean this one?



If so, I guess this means the passenger side isn't original.

Ed

Ed------


Are you sure there are no other numbers on it? I can only see one side in the photo.

In any event, I have never seen one like this. However, that does not mean that it could not be original.

Another point: my guess is that if you remove these, you're going to find significant corrosion damage on the shock mount end of the shafts. This weakens the shafts and makes their re-use inadvisable.

[Edward B.]

Re: F41 shock mount with a strange forging

Well, I pulled the tire and sure enough, there it was on the side. 3820930 (standard shock mount). Looks like the passenger side has been replaced at some point. Now I have to find a 3829265-66 for the passenger side. And of course, this is the one side that no one has (at least not on ebay), so I'm sure it's the one that commands the big $$$!

Ed

[Joe L.]

Re: F41 shock mount with a strange forging

Well, I pulled the tire and sure enough, there it was on the side. 3820930 (standard shock mount). Looks like the passenger side has been replaced at some point. Now I have to find a 3829265-66 for the passenger side. And of course, this is the one side that no one has (at least not on ebay), so I'm sure it's the one that commands the big $$$!

Ed

Ed-------


I would not even rule out that this is the original, although incorrect. Mistakes did happen at St. Louis and one like this would be very easy to make and very difficult for anyone to catch..

[Edward B.]

Re: F41 shock mount with a strange forging

Oh really? That's interesting. My car's an October 21st, 1969 build, so it's very late in the model year. I guess anything's possible, but this is going to bug me now that I know it's not "correct"!!

Ed

[Edward B.]

Re: F41 shock mount with a strange forging

Joe, coming back to this with an additional question.

I've posted a WANTED AD over on the other site requesting the passenger side shock mount, but since both the passenger side and the driver side have the same casting number on them, how do you tell which side is which??? I know it's the "bend" and the cut in the threads, so am I correct in saying that the one of the bottom of my picture is the driver side and the one on the top is the passenger side?

Thanks

Ed

[Joe L.]

Re: F41 shock mount with a strange forging

Joe, coming back to this with an additional question.

I've posted a WANTED AD over on the other site requesting the passenger side shock mount, but since both the passenger side and the driver side have the same casting number on them, how do you tell which side is which??? I know it's the "bend" and the cut in the threads, so am I correct in saying that the one of the bottom of my picture is the driver side and the one on the top is the passenger side?

Thanks

Ed

Ed-------


The HD shock mounts are completely symmetrical AS FORGED. However, they are not the same AS MACHINED. The difference is the side which the flat is machined for the bearing support end of the shaft. With the shock mount laid on it's side and the shock mount end pointing to the left. the driver side mount spindle support shaft flat will be facing UP and the passenger side mount flat will be facing DOWN.

[Edward B.]

Re: F41 shock mount with a strange forging

That's what I thought. So in my picture below, the bottom mount is the driver side and the top mount is the passenger side, right?

Ed

[Joe L.]

Re: F41 shock mount with a strange forging

That's what I thought. So in my picture below, the bottom mount is the driver side and the top mount is the passenger side, right?

Ed

Ed------


Yup, that's it.

[Edward B.]

Re: F41 shock mount with a strange forging

Thanks again Joe. Now to find one!

Ed

[Joe L.]

Re: F41 shock mount with a strange forging

Thanks again Joe. Now to find one!

Ed

Ed------


Finding one should not be too difficult. Finding one with no embossed numbers is easy. The current replacements which are essentially the same as those sold by GM for many years before they were discontinued, are pretty much correctly configured except for the numbers. Good used originals with the numbers will be harder to find. You'll be looking for one with no significant corrosion damage (usually found on the shock mount end of the shaft) and no impact damage (from someone trying to beat one out with a hammer) on the other end of the shaft.

[Edward B.]

Re: F41 shock mount with a strange forging

Yeah, I can get a replacement for around $40, but I'd rather have an original with the casting number. I missed out on a set about a month or so ago for $25!!!

Oh well. That's always the case.

Ed