Duramax Diesels Forum Truck of the Week
  #16  
Old 03-12-2017, 08:51 PM
joshd472 joshd472 is offline
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Originally Posted by Chevy1925 View Post
Your thinking about this too hard. He's keeping the overload. Pulling a leaf and leaving the over load means more spring will lay on the overload which does not flex well unloaded. You reduced the spring rate of the primary stack but the travel you have before the overload starts to increase spring rate becomes much less.

Removing the overload let's the springs only work on their primary spring rate. There is no extremely stiff spring under the main pack for the springs to start layers no against and effectively start increasing spring rate till the primary springs are in full contract with the overload.

This is why trucks with worn out leafs ride like hell compared to a new set of stock leaves
I 100% agree with this. Growing up racing motocross a lot of my buddies who were just starting out (very slow riders) complained thier suspension was to stiff once they started to pick up a little speed. 99% of time I could watch them for 1 lap and it was obvious thier suspension was too soft and using the latter part of the stroke to much. They were blowing straight the plush part of the stroke. Remember suspension is progressive the further in the stroke you the more harsh it will feel.
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  #17  
Old 03-13-2017, 06:59 AM
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Originally Posted by Chevy1925 View Post
Your thinking about this too hard. He's keeping the overload. Pulling a leaf and leaving the over load means more spring will lay on the overload which does not flex well unloaded. You reduced the spring rate of the primary stack but the travel you have before the overload starts to increase spring rate becomes much less.

Removing the overload let's the springs only work on their primary spring rate. There is no extremely stiff spring under the main pack for the springs to start layers no against and effectively start increasing spring rate till the primary springs are in full contract with the overload.

This is why trucks with worn out leafs ride like hell compared to a new set of stock leaves
Ahh I see. That does make sense. Okay thank you guys for the help. I'll probably pull the overloads and use lowering shackles
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  #18  
Old 03-13-2017, 07:23 AM
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Quote:
Originally Posted by joshd472 View Post
I 100% agree with this. Growing up racing motocross a lot of my buddies who were just starting out (very slow riders) complained thier suspension was to stiff once they started to pick up a little speed. 99% of time I could watch them for 1 lap and it was obvious thier suspension was too soft and using the latter part of the stroke to much. They were blowing straight the plush part of the stroke. Remember suspension is progressive the further in the stroke you the more harsh it will feel.
it depends on spring but most suspension is linear, not progressive. there is a big difference between the two. even "progressive rate springs" are not truely progressive but closer to a dual stage linear spring.
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  #19  
Old 03-13-2017, 10:15 AM
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I'd pull the overload and run bags, I've seen a few guys run the schrader valves out where the licence plate bolts on, think that looks pretty slick. What is the proper way and recommended shim to install when dropping 3"?
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  #20  
Old 03-13-2017, 12:41 PM
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Originally Posted by bigmackmiller View Post
I'd pull the overload and run bags, I've seen a few guys run the schrader valves out where the licence plate bolts on, think that looks pretty slick. What is the proper way and recommended shim to install when dropping 3"?


Depends on how you drop it.

My air bag lines are run that way currently as well. Easier for the compressor in the trailer to reach too
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BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

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  #21  
Old 03-13-2017, 12:43 PM
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Depends on how you drop it.

My air bag lines are run that way currently as well. Easier for the compressor in the trailer to reach too
Well was just thinking if a guy just did drop shackles
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  #22  
Old 03-13-2017, 01:45 PM
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Quote:
Originally Posted by bigmackmiller View Post
Well was just thinking if a guy just did drop shackles
3* shim is plenty
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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  #23  
Old 03-19-2017, 01:05 PM
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So I got my drop shackles in the mail the other day. My plan is to take the overload out for ride quality and level with the adjustable shackles. My question is this. I've read a few guys talk about needing center pins. Can anyone shoot me a link of where to get new ones and which ones to get? Also the u bolts. Some say they had to shim them an inch with washers. Seems kinda sketchy to me.
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  #24  
Old 03-19-2017, 01:55 PM
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If you are going to pull the overloads, probably should get some kind of anti axle wrap bars.
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  #25  
Old 03-19-2017, 02:16 PM
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Originally Posted by Harbin_22 View Post
If you are going to pull the overloads, probably should get some kind of anti axle wrap bars.
I may leave them in for now. Eventually I'll eat some trac bars but don't have the money now
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Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1993 Yamaha Waverunner 3
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  #26  
Old 03-19-2017, 02:20 PM
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Your overloads help control the axle. When you take them out, they can get wild if you are beating on it
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  #27  
Old 03-19-2017, 04:38 PM
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I got all my stuff from http://www.autoandtrucksprings.com. I believe the alignment bolts are 3/8 and the stock u bolts should be good to use again unless the are really eaten up from over the years.
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  #28  
Old 03-19-2017, 06:13 PM
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Originally Posted by 1SloLMM View Post
I got all my stuff from http://www.autoandtrucksprings.com. I believe the alignment bolts are 3/8 and the stock u bolts should be good to use again unless the are really eaten up from over the years.
Awesome thanks for the info

Got the wheels Thursday. This is gonna be sketchy.
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Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1993 Yamaha Waverunner 3
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  #29  
Old 03-20-2017, 09:20 AM
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I run drop shackles on every one of my rigs. My street truck has shackles and no overloads. You will need traction bars or Caltracs to stop the axle wrap without the overloads. Ride quaility is dramatically better though.
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  #30  
Old 03-23-2017, 07:25 PM
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So after much realization today. The truck is no longer going to be lowered. Woulda had to saw the fender off haha guess a lift kit will be on the way after the wheels are paid off


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2002 Chevy EC/SB LT 4x4. S&B intake. 5" Magnaflow SP. LML manifold. PPE stage 5 tranny. 30% over Bosch injectors. LBZ SuperSport pump. Studs. All powder coated. EFI by tony. Twin Kennedy pumps. Glowshift EGT/Boost/Oil Temp gauges. 2 MTX 12s with a Hifonics amp. Windows so dark I can't see at night. Leveled on 22x12s and 305/40 Proxes ST

Other toys:
"Tank" 1982 K10 6.2 Detroit diesel/sm465/np205 with 4 inches of lift and 35s. Slow and indestructible
2011 Yamaha YFZ450X
1993 Yamaha Waverunner 3
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