Is it possible to get polyurethane shackle bushings?

Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » January 21st 2021, 1:26am

I am looking for polyurethane replacement bushings for the stock shackles on my van. The shackle to frame connection to be specific.

I removed the shackles, got the rubber out, bonked out the metal cups the rubber was in, and cleaned them up.

I took a lot of measurements with my calipers of the shackles and stock sleeves (there were two per shackle because there was a bushing pressed into each side of the shackle). I also have Prothane 19-608 for reference, as I had thought they would fit. It is not so. They are too small of an OD and definitely too short

Pictures are attached, but here are the important measurements -
- ID of shackle ~ 1.61"
- Length of shackle ~ 3.93"
- Width of shoulder needed - 0.25"
- OD of stock sleeves - 0.82"
- ID of stock sleeves - 0.62"
- Length of stock sleeves - 2.23" (x2 per shackle)

I have emailed many companies that produce or sell poly bushings this past week and have not gotten any helpful responses.

Does anyone know of a bushing that will work for our stock shackles?

It seems like I have a couple options -
- buy multiple sets, then shave them down so the OD fits inside the shackle, and cut the hat off another to fill the gap in the middle. Then get/make a sleeve that is long enough.
- install new metal cups like there were before, and put bushings in that will fit - still will probably have an issue with gap in the middle and sleeve length
- other???

The few other threads on this forum and the other where people are looking for bushings all seem to assume the cups are being left in, or it is for non-stock shackles. So, unhelpful.

I had no idea replacing these bushings was going to be such a pain. I am considering going back to rubber just to get it done - but I really want poly for ease of install and replacement more than anything.

Anyone have any ideas for me on where to get these? Thank you!
Attachments
2021-01-13 22.21.45.jpg
Metal cups that were in there - you can see how there is a gap in between - one was pressed in from each end
2021-01-14 18.25.06.jpg
Smashed the metal cups out
2021-01-14 19.14.58.jpg
Stock shackle measurements
2021-01-14 19.21.17.jpg
2021-01-14 19.13.25.jpg
Stock sleeve measurements
2021-01-14 19.13.42.jpg
There were two of these sleeves per shackle - since there was one in each half of the pressed in bushings
2021-01-14 19.14.10.jpg
2021-01-14 19.16.10.jpg
Measurements of Prothane 19-608 for comparison - these fit the leaf spring eyelets perfectly. But, the length is far too short, and the outer diameter is just a bit too small
2021-01-14 19.16.25.jpg
2021-01-14 19.17.30.jpg
2021-01-14 19.17.45.jpg
2021-01-14 19.18.08.jpg
2021-01-14 19.18.39.jpg
2021-01-14 19.18.55.jpg
2021-01-13 22.35.03.jpg
Clearly Prothane 19-608 is far too small
2021-01-14 19.22.30.jpg
The shoulder is the right size though - it fits in the shackle to frame connection well.
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » January 23rd 2021, 6:36pm

Still wondering if anyone has info about this?

At the moment, it is looking like I will do this unless I hear otherwise:

- Buy 2x 4-7/16" long, 3/4" od, 0.56" id, .095" wall thickness stainless tubing from here - https://www.speedymetals.com/pc-3430-82 ... -tube.aspx
- Buy 6x these poly bushings, 43mm od, 3/4id, 0.25" shoulder thickness. I'll cut the hat off two of them and use them in the middle. https://www.offroaddesign.com/catalog/p ... egory/415/

I might have to sand down the od of the bushings just a bit to get them to fit, as 43mm is like 1.69".

Not ideal, but this is the best option I've found so far.
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Re: Is it possible to get polyurethane shackle bushings?

Postby dcsleeperdcsleeper is online! » January 23rd 2021, 7:08pm

measure your center to center distance of your stock shackles and tell me.
I will see if you can just drill holes in the lift shackles and use those.
reasons: cheaper, availability
https://www.amazon.com/Silverado-Adjustable-Lowering-Shackles-Leveling/dp/B071VR3TQT
also, I don't think you need to fill the entire length of the bolt.


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Re: Is it possible to get polyurethane shackle bushings?

Postby astroracer » January 25th 2021, 3:16pm

Got to your LAP and have them cross reference the part numbers for your van to any other GM vehicle. You will find many of the suspension components like bushings are widely used across the van and truck lines. Knowing what else will work can open up the sources for finding what you need. :)
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » January 25th 2021, 4:03pm

What about the possibility of swapping the s10/blazer shackles?
Anybody got specs for those?

Stock Shackle Bushing specs
ACDelco Pro 45G15393
Outside Diameter: 42.7 MM
Thickness: 28.45 MM
Height: 76.2 MM
Inside Diameter: 0.560 IN
Interchange Part Number: 274-6977, 35400, 576-3393, 576-3393B, 88913006
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » January 25th 2021, 6:36pm

dcsleeper wrote:measure your center to center distance of your stock shackles and tell me.

What do you mean by this?

astroracer wrote:Got to your LAP and have them cross reference the part numbers for your van to any other GM vehicle. You will find many of the suspension components like bushings are widely used across the van and truck lines. Knowing what else will work can open up the sources for finding what you need. :)
Mark

Good point, I should go ask Autozone

MI_Ghost wrote:What about the possibility of swapping the s10/blazer shackles?
Anybody got specs for those?

Stock Shackle Bushing specs
ACDelco Pro 45G15393
Outside Diameter: 42.7 MM

I believe the upper part of the shackles on other vehicles is too narrow compared to ours, not sure though.
However, if 42.7mm is really the od of stock replacement shackle bushings, then the 43mm od for the poly bushings I found is darn close. That's nice.
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » January 25th 2021, 7:22pm

Astro Van Safari Leaf Spring Shackle.jpg
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Re: Is it possible to get polyurethane shackle bushings?

Postby dcsleeperdcsleeper is online! » January 25th 2021, 7:29pm

SportsBoy wrote:
dcsleeper wrote:measure your center to center distance of your stock shackles and tell me.

What do you mean by this?


the 4.415 dimension in the pic above
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Re: Is it possible to get polyurethane shackle bushings?

Postby CopperFiremist » January 25th 2021, 10:00pm

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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » January 25th 2021, 10:59pm

Yep, posted in there, but the answer isn't in there.
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » February 8th 2021, 3:11pm

SportsBoy wrote:Still wondering if anyone has info about this?

At the moment, it is looking like I will do this unless I hear otherwise:

- Buy 2x 4-7/16" long, 3/4" od, 0.56" id, .095" wall thickness stainless tubing from here - https://www.speedymetals.com/pc-3430-82 ... -tube.aspx
- Buy 6x these poly bushings, 43mm od, 3/4id, 0.25" shoulder thickness. I'll cut the hat off two of them and use them in the middle. https://www.offroaddesign.com/catalog/p ... egory/415/

I might have to sand down the od of the bushings just a bit to get them to fit, as 43mm is like 1.69".

Not ideal, but this is the best option I've found so far.

Ok, as an update, I did end up donig this.

One note - the shackle bolts are m14 (14mm) - which is slightly smaller than 9/16". 9/16" bolts won't fit in these stainless sleeves.

Got the tubes in the mail and filed the ends to clean them up. Got the bushings in the mail too.
2021-02-06 17.04.16.jpg

2021-02-06 17.40.47.jpg
Used a belt sander to shrink the diameter a bit - which took kind of a while and made a mess. If you had a bench mounted sander rather than a hand held one I'm sure it would be WAY EASIER

2021-02-06 17.54.33.jpg
Cut the end off one with a razor blade - not easy either.

2021-02-06 17.04.34.jpg
The cleaned up and painted shackle it went in

2021-02-06 20.35.10.jpg
Got it all lubed up and tapped everything in with a hammer

2021-02-06 20.35.15.jpg

2021-02-06 20.35.25.jpg

No pic of it installed yet - though it is in with the leaf spring attached.

It was a snug , but good fit - I think a 4-3/8" sleeve would have worked as well and tightened up just fine. 4-7/16 was definitely just a hair less than the space.
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » February 9th 2021, 7:31am

MI_Ghost wrote:
Stock Shackle Bushing specs
ACDelco Pro 45G15393
Outside Diameter: 42.7 MM
Thickness: 28.45 MM
Height: 76.2 MM
Inside Diameter: 0.560 IN
Interchange Part Number: 274-6977, 35400, 576-3393, 576-3393B, 88913006

Did some back tracking on the interchange for this and got broadsided by the :chevy: C1500.
88-98 Chevy C1500 RWD also use this bushing.

The good news/bad news is that the poly version is available in the Prothane 7-1055 kit, but the leaf spring bushings are the RB172 bushings. The Astro/Safari leaf springs use the RB255 leaf spring bushings.
The only other issue I see is the 3 inch length will need a longer inner sleeve for the bolt and leave a 1 inch gap in the middle of the shackle. :shrug:

But all is not lost. :shrug:

Everyones favorite S-10 leaf spring does use the RB172 bushing.
The 7-1055 kit will work for the S-10 spring swap.
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » February 10th 2021, 11:44pm

I'm confused, this doesn't look like it would work. The shackle bushings are bigger than the leaf spring bushings on our van, not smaller as in this picture.
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » February 14th 2021, 7:01pm

Be careful how you look at pictures. Those big bushings on the right are for the leaf spring.
The shackle bushings are the left side. Note the difference in the flange area.

I am also wondering about this as they only provide the 3" sleeve.
I keep running into conflicts between spring and bushing specs. :confused:
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » February 15th 2021, 3:04am

MI_Ghost wrote:Be careful how you look at pictures. Those big bushings on the right are for the leaf spring.
The shackle bushings are the left side. Note the difference in the flange area.

Exactly, on our vans the leaf spring bushings have a smaller diameter than the shackle bushings, so if the biggest bushings there are for the springs, then that kit won't fit.

As I mentioned, I did take a pic of the shackle installed - the first 50 miles went well!

2021-02-14 12.10.23.jpg
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » February 15th 2021, 4:59pm

SportsBoy wrote:
MI_Ghost wrote:Be careful how you look at pictures. Those big bushings on the right are for the leaf spring.
The shackle bushings are the left side. Note the difference in the flange area.

Exactly, on our vans the leaf spring bushings have a smaller diameter than the shackle bushings, so if the biggest bushings there are for the springs, then that kit won't fit.


Correct. As noted in my post.
Only the shackle bushings in that kit will work for our vans.
I am still looking to see if the shackle bushings can be found ouside of a full kit.
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Re: Is it possible to get polyurethane shackle bushings?

Postby AstroWill » February 15th 2021, 9:34pm

Would be nice if they made an all-in-one kit for our vans instead of having to find pieces here and there.
Good work guys!

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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » February 15th 2021, 10:27pm

MI_Ghost wrote:
SportsBoy wrote:
MI_Ghost wrote:Be careful how you look at pictures. Those big bushings on the right are for the leaf spring.
The shackle bushings are the left side. Note the difference in the flange area.

Exactly, on our vans the leaf spring bushings have a smaller diameter than the shackle bushings, so if the biggest bushings there are for the springs, then that kit won't fit.


Correct. As noted in my post.
Only the shackle bushings in that kit will work for our vans.
I am still looking to see if the shackle bushings can be found ouside of a full kit.

Ok, I'm confused - we've got to be miscommunicating here somehow.
The leaf spring eyelets, at least on the 22-687hd's I just swapped are 1.5" diameter.
The stock van shackle are ~1.63" diameter bare with no sleeve.
If the largest bushing in that kit is for the springs, it would have a 1.5" diameter.
Meaning it would be too small for the shackle.
Am I still misunderstanding what you're getting at?
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Re: Is it possible to get polyurethane shackle bushings?

Postby SportsBoy [OP] » February 15th 2021, 10:28pm

AstroWill wrote:Would be nice if they made an all-in-one kit for our vans instead of having to find pieces here and there.
Good work guys!


I know right??????
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Re: Is it possible to get polyurethane shackle bushings?

Postby MI_Ghost » February 15th 2021, 11:36pm

SportsBoy wrote:
MI_Ghost wrote:Correct. As noted in my post.
Only the shackle bushings in that kit will work for our vans.
I am still looking to see if the shackle bushings can be found ouside of a full kit.

Ok, I'm confused - we've got to be miscommunicating here somehow.
The leaf spring eyelets, at least on the 22-687hd's I just swapped are 1.5" diameter.
The stock van shackle are ~1.63" diameter bare with no sleeve.
If the largest bushing in that kit is for the springs, it would have a 1.5" diameter.
Meaning it would be too small for the shackle.
Am I still misunderstanding what you're getting at?

The kit is for the 22-1221 springs for the C1500/Siverado. Which has a bigger front spring eye.
The 4 big bushings are the 2.0" RB250 bushing for the front spring eye.
The 4 middle bushings are the 1 11/16" RB172 bushing for the rear spring eye.
The 4 small bushings on the left are the shackle bushings. Note the smaller Flange/lip.
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Rear-EndA differential is a device employing gears capable of transmitting torque and rotation through shafts. Essentially the differential allows each of the driving wheels to rotate at different speeds in the rear axle.
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