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Suspension & Steering - 2001 - 2010 Discuss OEM & aftermarket suspension, lifts, street suspension, air ride suspension, steering components, etc. First through fourth generation.

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Old 08-08-2015, 02:14 PM   #1 (permalink)
glamisorbust
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Help identifying leaf spring problem

I have a 2007 classic CCSB that is giving me some trouble in one of the leaf springs. Here's what the truck is doing. Under acceleration, you can feel something popping in the rear end. Same thing when you're pretty hard on the brakes. All my passengers definitely notice and ask me what's wrong with the truck. So I started investigating.

I had a friend put the truck under load in gear both forward and reverse while I watched. The rear end is moving underneath the leaf springs. It looks like the bottom overload spring is twisting under load.

So I jacked the truck up, took off both U-Bolts and made sure the center bolt for the leaf spring pack was not broken. It's in good shape. So I put the U-Bolts back on and tightened everything up. Didn't change a thing, the popping is getting worse. Has anyone seen this before? What was the fix? It only does it on the driver's side of the truck.

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Old 08-08-2015, 04:36 PM   #2 (permalink)
blackart
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Originally Posted by glamisorbust View Post
.......The rear end is moving underneath the leaf springs.... Has anyone seen this before?
I have seen something similar to what you describe, in that case the axle tube was loose where it was joined to the rearend housing center section. I have to believe that's pretty rare though.

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Old 08-08-2015, 04:47 PM   #3 (permalink)
christopherglenn
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Pry the ends of the leafs apart (I used a pair of big flat blade screwdrivers), and shoot a little grease between the leafs. Check if all the plastic isolators are still there (on the ends of the springs).
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Old 08-08-2015, 05:30 PM   #4 (permalink)
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Quote:
Originally Posted by blackart View Post
I have seen something similar to what you describe, in that case the axle tube was loose where it was joined to the rearend housing center section. I have to believe that's pretty rare though.
Depending on how you use your truck, it happens.
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Old 08-09-2015, 01:10 AM   #5 (permalink)
glamisorbust
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[QUOTE=christopherglenn;7580242]Pry the ends of the leafs apart (I used a pair of big flat blade screwdrivers), and shoot a little grease between the leafs. Check if all the plastic isolators are still there (on the ends of the springs).[/QUOTE

Why would shooting grease in between the leafs stop it from doing this? It's almost like something is loose. I actually thought the U-bolts were loose. The axle is not moving in the housing, the whole entire rear end moves forward and back when torque is applied.
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Old 08-09-2015, 02:40 PM   #6 (permalink)
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glamisorbust, have you ever had the truck stuck and been pulled out by hooking the tow strap to the rear end?
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Old 08-09-2015, 03:29 PM   #7 (permalink)
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Have you checked the front eye bushings and the rear shackles?
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Old 08-09-2015, 05:57 PM   #8 (permalink)
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Just a thought, but have you checked the leafs for any cracks near the centerbolt? I had a K5 Blazer at one time, and the main leaf was cracked, causing the axle to shift very slightly under load.
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Old 08-09-2015, 06:31 PM   #9 (permalink)
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Lube the driveshaft splines.
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Old 08-09-2015, 07:58 PM   #10 (permalink)
christopherglenn
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[quote=glamisorbust;7581194]
Quote:
Originally Posted by christopherglenn View Post
Pry the ends of the leafs apart (I used a pair of big flat blade screwdrivers), and shoot a little grease between the leafs. Check if all the plastic isolators are still there (on the ends of the springs).[/QUOTE

Why would shooting grease in between the leafs stop it from doing this? It's almost like something is loose. I actually thought the U-bolts were loose. The axle is not moving in the housing, the whole entire rear end moves forward and back when torque is applied.
As the springs flex, the ends of them slide past each other, making all kinds of grinding and scraping noises. Lube them and see if it changes, if so, check for the isolators, and replace them. If nothing changes, and you don't have a broken spring, you can rule out the spring pack. Then it is the axle, spring to axle mount, spring to hanger, hanger to frame, or frame issue.

While you are under there, check the hangers and shackles are intact and not loose.

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