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Old 06-17-2019, 12:52 PM
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What size to make custom trailing arm bushing holes...

I have a 1972 Buick Riviera. Aftermarket does not exist for this car. My trailing arms are rusted to death.

I am going to weld up some new trailing arms, but I am unsure of what diameter to make the holes that the bushings press into... I can measure the new bushings, but they always fit so snug... is that an exact fit or is the hole 0.002" smaller for example? I could measure my old trailing arms but by the time I coerce the old bushings out of them any subtle differences (e.g. 0.002") would be indiscernible.

I'm also very open to any hotrodding wisdom I'm not aware of like "A-Body trailing arms will fit E-body cars" or something...

Thanks!

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Old 06-17-2019, 01:36 PM
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Quote:
Originally Posted by jamieson View Post
I have a 1972 Buick Riviera. Aftermarket does not exist for this car. My trailing arms are rusted to death.

I am going to weld up some new trailing arms, but I am unsure of what diameter to make the holes that the bushings press into... I can measure the new bushings, but they always fit so snug... is that an exact fit or is the hole 0.002" smaller for example? I could measure my old trailing arms but by the time I coerce the old bushings out of them any subtle differences (e.g. 0.002") would be indiscernible.

I'm also very open to any hotrodding wisdom I'm not aware of like "A-Body trailing arms will fit E-body cars" or something...

Thanks!
I would call these guys and pick their brains....
https://umiperformance.com/catalog/i...age=contact_us

I have crafted control arms and pressed bushings into them before. I used my Machinist Handbook to determine the dimensions, but that book was stolen from a storage facility in California several years ago, along with several other tools and items given to me by my father many years ago. Again, my best suggestion is to talk with the UMI engineers.
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Old 06-17-2019, 03:00 PM
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Thank you, I will try them out!
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Old 06-17-2019, 03:04 PM
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GM has a way of using a part on several different vehicles and across many years use the same part...rear lower control arm on GM A-body for example is the same from 64-77 IIRC....you might want to find out Center-to-center dimension on a set of those before you go making them....they could be the same as your Riviera.

could also be the same as B-body(full size chassis). Riviera rear arm lower bushings are cataloged as the same as LeSabre and Electra. So are the upper bushings.

Aftermarket may just not list them as also fitting the Riv, just from lack of demand.
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Old 06-17-2019, 07:14 PM
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The bushings may be the same, but the arms are different. I scoured the web from A to Z before I posted my answer.
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Old 06-18-2019, 08:27 AM
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Find someone with an old Hollander's Manual for that year range, that should tell you if there is a more readily available arm. Thinking about it, I'm kinda surprised no one on the forum has access to a Hollander's. New ones are pricey, but the older versions are useless for anybody but rodders...

Russ
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Old 06-18-2019, 11:15 AM
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That is an excellent idea, I should track one of those manuals down. I'm sure I am going to run into issues sourcing parts many, many, times before my build is complete.
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Old 06-18-2019, 11:51 AM
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Poly bushings are readily available.
Trying to make precision sized holes would be a total PITA.


https://www.speedwaymotors.com/Speed...UaAiDKEALw_wcB
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Old 06-18-2019, 05:42 PM
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Quote:
Originally Posted by 123pugsy View Post
Poly bushings are readily available.
Trying to make precision sized holes would be a total PITA.


https://www.speedwaymotors.com/Speed...UaAiDKEALw_wcB
Nice find...that would be the way I'd do it, rectangular or round tube with a tubular sleeve welded on each end sized to accept that easily available Speedway bushing kit...rather than monkey around with press fit factory style bushings.
Would come out very nicely done and be twice the strength of the factory arm and look swift too.

You can narrow that Speedway bushing by cutting the inner side of each bushing half, then shorten the center tube. Freeze the bushing overnight and it will cut much better with a saw, or turn it in a lathe.
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Old 06-18-2019, 11:28 PM
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You might try here polyurethane T bushings by size
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