Front Subframe Bushings

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Front Subframe Bushings

Post by keithg on Mon Sep 10, 2018 1:54 pm

Anyone here need front subframe bushings? Mine makes a noise once in a while and I think it is the subframe banging against the unibody. I looked for these a while ago and was unable to find anything. Is there an old Chevy model which is the same? If not, I am considering making a mold and molding a set for mine. Does anyone have the measurements or a set that they could measure? I do not want to have to take it off the road to do this or it would be down for months. This is the left front:
Pic of Bushing

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Re: Front Subframe Bushings

Post by regal81455 on Tue Sep 11, 2018 7:14 am

Seems I saw them some place - you've checked with Steele and AMES performance correct?  Maybe as a Tempest part?

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Re: Front Subframe Bushings

Post by keithg on Tue Sep 11, 2018 8:44 am

Tried: Kanter, Year One, Ames, Clarks Corvair, Steele. No dice. I found them at one point, too, but cannot remember where. I thought they were NOS and really expensive, but could be mistaken. NOS for a rubber part is probably not what we want. Cannot find my old link.

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Re: Front Subframe Bushings

Post by regal81455 on Tue Sep 11, 2018 9:21 am

Ok yeah maybe I saw NOS ones on fleabay - that definitely could've been the case.

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Re: Front Subframe Bushings

Post by skylarkman2 on Tue Sep 11, 2018 9:45 am

So far as I know, no one makes these.
One of the members on the old yahoo group contacted me.
I have some NOS bushings (rubber covered washers) that I have offered to him to produce some polyurethane ones.
I will try to remember to post when available.
I will encourage him to join the forum.
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Re: Front Subframe Bushings

Post by regal81455 on Tue Sep 11, 2018 9:51 am

That would be great - please keep us posted!

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Sun Sep 16, 2018 9:44 am

There seems to be some debate on this and I may be wrong but I believe the 61 bushings are different from the 62-63 bushings. Just to be clear, the picture only shows the washers, the mounts/bushings are inside the barrel above the washer. Either here or on the Jetfire site there is a guy who posted a thread where he had a 62 with damaged bushings and used some 61 bushings. While they fit in the subframe pocket the car did not seat fully on them and sat a little high, didn't look too stable. The 61 bushings have a jagged top to the rubber while the 62-63 does not. It would be great to get some new mounts, although mine are not damaged I think the old rubber contributes to some of the cowl shake in my convertible.

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Re: Front Subframe Bushings

Post by keithg on Mon Sep 24, 2018 9:46 am

I believe Skylarkman2 is Dave from the Yahoo forum. (correct me if I am wrong) I was the guy asking him for mounts to make a mold/drawings. I want to make a mold so we can have mounts. There is no way that 55 year old mounts have any give to them. I can see mine are moving around as I drive it and hear clunks when I do. I have not taken mine apart as it would be off the road indefinitely until I made something and they would be destroyed as I removed them. Can anyone point me to the pictures showing what all the components look like?

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Mon Sep 24, 2018 12:09 pm

You don't need a mold. The mount is a metal shell with a metal tube in the center surrounded by rubber in the shell. It's a vulcanizing process to stick it all together. There are shops who do this but not cheap.

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Re: Front Subframe Bushings

Post by keithg on Mon Sep 24, 2018 7:37 pm

So here is the deal. I get that. That is what I thought it would be, a sleeve with a vulcanized doughnut and a central sleeve.
image from chassis manual
This is what is in the manual. I believe this can be re-designed as 2 rubber top hats and a sleeve plus a washer. Anything will be better than what is in there now. The problem is I do not know how big to make it all unless I can get a used one or a NOS one or measurements off a subframe that is no longer on a car. If I can leverage this group for that bit, I can design a replacement. What I am thinking is something like this:

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Mon Sep 24, 2018 8:18 pm

What durometer level are you thinking?

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Re: Front Subframe Bushings

Post by keithg on Mon Oct 01, 2018 10:35 am

Well, I am guessing the OEM was 70 when they were new. I'll have to see what I can get. I want them to be soft as these will be a more stiff of a connection between the subframe and the unibody than the OEM bushing arrangement.

I measured them last night. The OD is 2" and the OD of the hat will be 2-5/8  and it will be ~3/8" thick. The center tube will be 5/8"ID by 3/4 or so OD. Still working on this.


Last edited by keithg on Mon Oct 01, 2018 11:46 am; edited 1 time in total

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Mon Oct 01, 2018 10:49 am

Here's a picture of the difference between the 61 mounts and 62-63 mounts. 61 mounts have the jagged top. Sorry, not removing the mounts at this time.








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Re: Front Subframe Bushings

Post by keithg on Mon Oct 01, 2018 11:48 am

Do you have any of them on hand even the original ones? I am wondering what the diameter of the center tube is and what the step diameter is. I am sure I can figure it out and if I am off, I can just put it in teh lathe and turn off a bit. Pretty sure I'll destroy mine getting them out. The pictures are of the R and L mounts. The front one is smaller.

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Mon Oct 01, 2018 11:56 am

I sold the 61 mounts to one of the members here I think. He may still have them loose, I'll look back to see who they went to and draw him into this thread.

The 62 mounts are in the front subframe sitting on the shop floor so I can get some measurements out of those in the next few days. Won't remove them though, don't want to damage them.

Yes the front mount is shorter but I think otherwise the same. I'll measure it too as much as possible.

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Re: Front Subframe Bushings

Post by 62cutlassconvert on Mon Oct 01, 2018 7:44 pm

Custom880 has or had the 61 mounts for the sides. Maybe he can get some measurements for those. He is currently active on the What I'm starting with and Front disc brakes threads. I'll see if I can draw his attention here.

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Re: Front Subframe Bushings

Post by custom880 on Tue Oct 02, 2018 8:24 am

I have a few 61 mounts sitting around may even have a extra front mount, just going to have to look around. pay shipping and give me a great discount if you make a few and I'll send them .
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