storkmack Posted April 4, 2016 Share Posted April 4, 2016 We looked at a 1979 RL600 a while back and it had a rear suspension that I have never seen before, not that that means anything. I'm just curious as to what it's technical name would be. My best guess is that it is a Mack version of Hendrickson extended leaf. You ride on the leaf springs when empty and on the walking beams when loaded. As far as the truck was concerned, it was a fairly clean factory 20k steer axle with an aluminum frame. The radiator was soft, busted leaf spring on the right rear and trunnion was in tough shape. We couldn't get together on a price we could work with, but the suspension still has my curiosity. Quote Link to comment Share on other sites More sharing options...
j hancock Posted April 4, 2016 Share Posted April 4, 2016 It is beam over leaf and uses the designation of SC. In the 80's, it was available with 34,000 (SC342) or 38,000 (SC38). Years before it was called SWC with the same ratings. The SC style uses the common rubber blocks and spring boxes to attach the axles and the SWC used springs with eyes and bolts to attach to the axles. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
storkmack Posted April 4, 2016 Author Share Posted April 4, 2016 thanks for the Info! My guess is that are not al that common around the Chicagoland area. Quote Link to comment Share on other sites More sharing options...
terry Posted April 4, 2016 Share Posted April 4, 2016 52 minutes ago, storkmack said: thanks for the Info! My guess is that are not al that common around the Chicagoland area. And very prone to breaking spring leafs. Quote Link to comment Share on other sites More sharing options...
Superdog Posted April 4, 2016 Share Posted April 4, 2016 My B53s have that suspension. Quote Link to comment Share on other sites More sharing options...
blackdog2 Posted April 4, 2016 Share Posted April 4, 2016 A-lot of oil company's used them due to the light weight without the walking beams and had several bad accidents Amoco Sunoco Gulf I had one kept it on box doing T-B-A would cost a lot to change it out Quote Ed Link to comment Share on other sites More sharing options...
terry Posted April 4, 2016 Share Posted April 4, 2016 (edited) 5 hours ago, Superdog said: My B53s have that suspension. The B53's had eye and bolt on the end, later ones had the T leaf. I drove a dump for years with the old one, always kept a spare spring in my shop, got to where I could change it in a couple of hours. terry Edited April 4, 2016 by terry Quote Link to comment Share on other sites More sharing options...
dogg rescue Posted April 5, 2016 Share Posted April 5, 2016 I've got that suspension on a '69 r-model straight truck it rides fairly well empty, and extremely stable loaded. Quote Link to comment Share on other sites More sharing options...
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