Joey Mack Posted Saturday at 04:33 PM Share Posted Saturday at 04:33 PM Lots of good points on this one.. So true JC.. checking the measurements at common points on each side is crucial. Keep the frame level and draw lines down the frame and transfer the measurements.. set up can take as long or longer than the drilling... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567674 Share on other sites More sharing options...
Geoff Weeks Posted Saturday at 04:36 PM Share Posted Saturday at 04:36 PM 10-12 years ago I got a low mileage walking beam with optional transverse torque rods on a long frame cut-off. Complete axles less drop-out for $700. Had 40K Eaton axles. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567675 Share on other sites More sharing options...
Geoff Weeks Posted Saturday at 04:38 PM Share Posted Saturday at 04:38 PM Never did a Camelback but have done walking beam. I don't think the specs are a loose for the walking beam, but regardless the closer to true the better the truck will be. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567677 Share on other sites More sharing options...
Joseph Cummings Posted Saturday at 04:48 PM Share Posted Saturday at 04:48 PM Helps to know some basic trig like the Pythagorean Theorem, or as carpenters call it "The 3 4 5 Rule" 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567678 Share on other sites More sharing options...
Geoff Weeks Posted Saturday at 04:58 PM Share Posted Saturday at 04:58 PM It isn't a question on how to measure (or shouldn't be) it is a matter of holding tolerance over a longer distance. Even supposed identical torque arms, when replaced will throw off alignment a bit. Having a aligned rear suspension makes a huge difference in the trucks ride and tire wear. The further up the frame your data points are the better they will show a thrust alignment problem. lasers (laser pointer even) can be a big help in being sure if you are working on a good level concrete floor. Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567679 Share on other sites More sharing options...
Joseph Cummings Posted Saturday at 05:15 PM Share Posted Saturday at 05:15 PM (edited) We were getting a lot of imported aftermarket camelback springs in the 80's and 90's. I saw trucks with 2 supposedly matched brand new springs have a 2 inch difference from side to side. How they wore tires I really don't know, mostly all dumps, mixers, roll offs, working in the city. Most tires got destroyed before they wore out. I hauled scrap metal for years, I spent lots more on tires than fuel lol. I was seriously considering foam fills for the dump trailers Edited Saturday at 05:16 PM by Joseph Cummings 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567680 Share on other sites More sharing options...
Geoff Weeks Posted Saturday at 05:46 PM Share Posted Saturday at 05:46 PM IDK if there are lightweight foam fills, but the ones we had on construction equipment weighed a TON, and were part of the counter-weight system. Company foam filled some tires on golf-carts for the jobsite it was hard getting them going and stopped, they had way too much mass. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567681 Share on other sites More sharing options...
Mark T Posted Saturday at 05:48 PM Share Posted Saturday at 05:48 PM On 1/23/2025 at 12:20 PM, 2014pinnacle said: Hi guys I have 2016 pinnacle with a twin y suspension it needs new bushings anyone know where I can purchase them my dealer says theirs none available and no idea when they could have them. The suspension shop the truck is at claim nobody after market makes them and I’ve been looking myself and that seems to be true I PMed you. Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567682 Share on other sites More sharing options...
Lmackattack Posted Saturday at 06:22 PM Share Posted Saturday at 06:22 PM Twin Y ........ also known as, Why did I buy this and Why didnt anyone tell me not to buy it. hope you find the parts I hear they are not a popular item that is in stock 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567683 Share on other sites More sharing options...
fjh Posted 19 hours ago Share Posted 19 hours ago On 1/25/2025 at 6:19 AM, Joseph Cummings said: this is a copy of A Radan suspension and is more for dump and mixer application! I remember seeing that flimsy looking y suspension being offered in some write ups touted as be light more pay load blabla ! Sounds like yup you pay alright! Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567743 Share on other sites More sharing options...
Geoff Weeks Posted 19 hours ago Share Posted 19 hours ago If I were to have walking beam (and have had), it would be spring. The walking beams, and any center point suspensions strong point is it dampens by transferring shock loads front and aft. The springs themselves don't do a whole lot of deflecting, and mainly on large "swells" where the load is on both axles at once. I don't see the air version as worth the complexity. I have run various spring suspension, and loaded properly they are fine. A lightly loaded walking beam on a short wheelbase tractor can and will "launch" the driver over a rough road. But any suspension will be rougher on a short wheelbase. KW 8 bag is notoriously rough despite haveing the most air bags of any air suspension. The Hendrickson designed Z spring combines the best of both worlds and has been around in some form or another for 50 years, only the walking beam design which has been around for about 100 years can claim longer life. Both are Hendrickson designs. The AR2 was never a big seller, and I have yet to see on a truck. Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567745 Share on other sites More sharing options...
Joseph Cummings Posted 14 hours ago Share Posted 14 hours ago We could go right to this lol. But after haveing run an Autocar 9964 with the RS (Rubber Pads) and replacing the tail light bulbs every time I bobtailed more than about 20 miles, I'd say it'd be a little too rough. I used to pull a Rodgers RGN that had those walking beams that had the axles cut in the middle, and between that and the RS Hendrickson under the tractor I started to understand why women wear sports bras Quote Link to comment https://www.bigmacktrucks.com/topic/75060-mack-twin-y-suspension/page/3/#findComment-567777 Share on other sites More sharing options...
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