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Isoclamp - what is this madness you speak of |
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Red Devil 
AMC Addicted 
Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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 Posted: May/23/2022 at 5:43pm |
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Snow, ice and salt are a curse upon those who must drive in the North ... especially the salt and brine.
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Regamble1969
AMC Apprentice 
Joined: Dec/01/2021 Location: Boise Idaho Status: Offline Points: 204 |
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Posted: May/23/2022 at 9:16pm |
I, like you, am learning my way through the new AMC ownership lexicon and idiosyncrasies. Per my usual way, I saw something I didn't know what it was and I just had to ask. The mighty Google God wasn't any real help but I knew the answer would be on this site.
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CamJam
Moderator Group 
Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6548 |
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Posted: May/24/2022 at 11:01am |
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So, is this "cushion" on the perch only, or does it run the full length of the spring? Can the cushions be added to a standard leaf spring? I live in Arizona, so salt and moisture are not an issue. I'd love to reduce NVH on my Javelins though.
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD  |
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Heavy 488
AMC Addicted
Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Posted: May/24/2022 at 12:06pm |
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Should be 2 pieces. Spring is sandwiched between perch and shock plate.
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danleym
AMC Addicted
Joined: Oct/17/2009 Location: Colorado Spring Status: Offline Points: 850 |
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Posted: May/25/2022 at 5:43pm |
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I can't get to them right now, but I can post pics of the ones I took off. heck, I could even send them your way if you're interested. The hardest part would be you would need new perches on your axle, because the mounting surface of the perch is different. I could cut mine off my old axle, too, cause I'm about to scrap it anyways.
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Hollis Danley
1980 Spirit, 258 2000 VW Jetta TDI 2002 Jeep Wrangler, 4.0 2015 Subaru XV Crosstrek |
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Regamble1969
AMC Apprentice
Joined: Dec/01/2021 Location: Boise Idaho Status: Offline Points: 204 |
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Posted: May/25/2022 at 7:15pm |
I really appreciate the offer, but my car doesn't have them. I'd never heard the term before and was overwhelmed with curiosity to know what they are. In fact, until this post I actually didn't know if my car did or didn't have them. Lol.
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danleym
AMC Addicted
Joined: Oct/17/2009 Location: Colorado Spring Status: Offline Points: 850 |
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Posted: May/25/2022 at 7:24pm |
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Sorry Regamble, I should've been more clear- CamJam expressed some interest in exploring putting them on his Javelin, so that message was meant for him. CamJam, if you're interested, pay for shipping and I'll send my isoclamp set up your way. I don't like having a bunch of stuff in my garage and they're probably just going in the trash anyway, I'd rather see someone use them.
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Hollis Danley
1980 Spirit, 258 2000 VW Jetta TDI 2002 Jeep Wrangler, 4.0 2015 Subaru XV Crosstrek |
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FSJunkie
AMC Addicted
Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Posted: May/26/2022 at 1:23am |
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Rather than bolting the leaf spring directly to the axle metal-on-metal with U-bolts, the spring is first clamped into a rectangular rubber bushing that surrounds the spring and then that bushing is clamped to the axle. That rubber bushing is called an Iso-clamp. Almost all luxury cars with leaf spring rear suspensions used them.
The difference in felt and heard roughness from the road in an AMC with a conventional clamped rear axle and an Iso-clamped rear axle is profound. Our unitized bodies transmit all sorts of road noise and small shocks throughout the body structure unless they are first isolated by the suspension with rubber. Springs and shocks (even soft ones) are great for taking out the big bumps, but not so great at taking out the small ones. Rubber bushings are needed there. That is where your front suspension strut rod bushings and your rear suspension Iso-clamps come in. Drive a Hornet sometime and then drive a Concord. Concords are WAY quieter and smoother despite having stiffer springs than a Hornet because Concords have Iso-clamps while Hornets don't, and Concords have more compliant strut rod bushings. Concords drive like butter. There is no smoother or quieter AMC. They are quiet even by modern car standards. I love my Concord.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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Regamble1969
AMC Apprentice
Joined: Dec/01/2021 Location: Boise Idaho Status: Offline Points: 204 |
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Posted: May/26/2022 at 1:31am |
Ooohhh, gotcha! No worries.
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Trader
AMC Addicted
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: May/26/2022 at 9:26am |
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FYI In the salt belt madness area. A piece of roof shingle top end without the grit works well for an "isoclamp". No rotting of spring perches or leaf spring cracking.Roof tar felt paper is also quite good for gas tank straps. for the same reason.
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danleym wrote: