Exile Posted November 27, 2018 Report Share Posted November 27, 2018 I’m scratching my head to figure out how the ride would change if i took a leaf out of my rear springs. It is a Peterbilt air trac, so the axle is mounted under a beam with spring on one end and air bag on the other. apologies if pics don’t post 98 379 with 12.7 DD LG Dodge w/5.9 CTD Chrome habit I’m trying to kick. Link to comment Share on other sites More sharing options...
CrazyCooter Posted November 27, 2018 Report Share Posted November 27, 2018 Probably have a horrible vibration due to axle wrap! By pics I found on the net, the weight is still supported by an air bag? The half pack and link locate the axle and control wrap? 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
jenandjon Posted November 27, 2018 Report Share Posted November 27, 2018 Yea you probably don't want to do that. I aired my rear tires down to 80 psi. That helped a lot. Farmer, Trucker, Equipment operator, Mechanic Quando omni flunkus moritati-When all else fails, play dead I'm a man, but I can change, if I have to, I guess. Link to comment Share on other sites More sharing options...
Exile Posted November 27, 2018 Author Report Share Posted November 27, 2018 My door sticker on this truck say to run tandems at 75 psi anyway (with 36k on them), so they’re at 70-75 now. Hmm, axle wrap, hadn’t considered that danger. This suspension has a torque bar that would prevent the bottom of the axle housing from moving longitudinally, and the increased flexibility of the front spring might allow the air bag to become over extended. Good point. 98 379 with 12.7 DD LG Dodge w/5.9 CTD Chrome habit I’m trying to kick. Link to comment Share on other sites More sharing options...
Exile Posted November 27, 2018 Author Report Share Posted November 27, 2018 Model shot of design 98 379 with 12.7 DD LG Dodge w/5.9 CTD Chrome habit I’m trying to kick. Link to comment Share on other sites More sharing options...
CrazyCooter Posted November 27, 2018 Report Share Posted November 27, 2018 Yes, that's the design I was looking at. Better than the old skool Airleaf, but only marginally better. You may not end up with excessive axle wrap since you will never load tandems even close to their intended design. I note axle wrap in the bottom gears while leaving a stop with my Airleaf when loaded close to the single axle's rating. Absolutely lower the tire pressure unless you are running at 36K! More than likely the load inflation table for your tire doesn't go below 65 psi, but I wouldn't hesitate to go below that if the number calc out to go lower. I run 75 psi in my drives, single axle, Jeep on the deck, and right at 19K axle weight. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
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