Zone Offroad C6159 Add-a-Leaf Kit

Not listed for a 2010 1500 Express Van, but worked perfectly. Install was straight forward, but You'll need some tools, and a helper is advised.Needed more spring in the rear to compensate for turning up the keys on the front of my van, and building the rear out as a camper. Large heavy duty C-Clamps are needed. My stock center bolt was long enough to add the leaf spring, and that was good because the ones provided were soft, fine thread. You could get by with them, and the instructions tell you to use clamps to pull the leaves together, Do Not use the bolt to pull the leaves together. Run the nut down snug with the C-clamps on add some lock-tight, and call it good. The U-Bolts will hold the springs together once installed, and all the bolt actually is a locating pin.Whole kit is about the same price as the spring clips by themselves. The clamps worked fine once the van was back on the ground, and are a little narrower than the spring so you can put a C-Clamp on and hammer it to the shape of the spring for a perfect fit. Kit is Worth it even if you have problems with your center bolt that can be made easily with regular bolts if needed.

I added these to my Silverado and at the same time removed my 2" lift block in the rear. I am now about a half inch lower in the rear that I was previously with no block at all and my leaf springs are directly on the axle. This helps with axle wrap.I picked up some gravel and on the scales I was 1400 pounds over my GVWR and with NO lift block and this add a leaf my bump stops were about a half inch above my axle.Previously with the taller than stock block and stock springs (meaning the bump stops started 1/2" higher than they are now) the my bump stops would be 1/2" above the axle when about 800 pounds over GVWR. Right now the truck probably carries around 600 pounds more at the same amount of squat.With the current setup with AAL and no block, the truck carries much more weight and the spring arch never flattens out and uses the overload spring. It physically can't flatten out all the way because the bump stops hit before the add a leaf touches the overload spring. This means a very nice loaded ride with mildly progressive feeling spring rate compared to before the loaded ride would have a "bottoming out" feeling when the soft springs flattened and the overload started working. If I still had my factory blocks on the axle, the springs could flex more and use the overload spring and the truck would probably carry 1000 pounds more than before at the same amount of squat.I don't recommend overloading a truck because there are lots of things that go into weight ratings. Adding a leaf doesn't change your door sticker but it will make the truck handle much better when loaded at its GVWR when also equipped with proper shocks that can control the stiffer springs. Many trucks rear axle weight rating is limited by tires or bearings. GVWRs might be limited by braking distance. The truck might take the load fine but it can't stop if a kid runs into the road. Add a leaf will make a truck feel much better when towing withing manufacturer recommended tongue weightsWith all that said, after installed these and loaded 2700 pounds in a half ton, they did not settle or sag. They maybe came down a half inch from 2" lift to 1.5" after the first load of gravel and since then I have hauled 7 loads of compost (probably 2000 pounds) to the garden and towed a 600 pound tongue weight trailer 3000 miles and they have not settled any more.I recommend Bilstein 5100s with these add a leafs because they have a lot of rebound dampening. If you slap these on with some 80,000 mile stock shocks, their rebound will way overpower the shock and your rear tires will bounce in the air all the time crossing railroad tracks or hitting potholes on curved onramps.I am running 5100s front and rear. Front is up 1.5" on 1.25" setting (stiffer springs in snow plow prep) and with the block removed and this add a leaf the rear is up about 1/4" from stock. Truck has about 1-1.5" rake and works hard plowing, towing, and hauling about every time it gets started. A few days a week it gets to be a bug spray truck and "haul the groceries" but other than that it is towing and hauling with great shocks and stiffer springs on all 4 corners.

My leaf springs on my 03 Silverado were saggy. I installed this kit last weekend and the rear end is up at least 2 inches. The hardest part was figuring out how to lower the rear end while having the body/frame high enough to get the new springs in. Once I figured that out, it was smooth sailing . Great product!

Has really helped my 25-year-old truck. Only took a couple of hours to install and came with everything I needed.

The springs themselves are great! The packaging however was terrible, which caused me to not get any of the hardware. Probably not a big deal considering everyone says how bad the hardware is that comes with these

Item works as advertised i bought these because my rear leafs are worn and bouncy even with new shocks so these helped stiffen it up so much. Install was easy. 10 outta 10

The leaf itself is fine. I used them to level out my 4runner on 63s and they worked great for that. But the hardware that was included is total garbage.

I have a 2005 Silverado 1500. Took about 2 1/2 hours to install without power tools. I’m not a professional, but I’m pretty experienced working on vehicles. The first side I used c-clamps to tighten up the spring pack, which took a while. On the second side I just stuck the jack under the axle and lifted until the springs were tight. Maybe not the safest way to do it, but it worked for me. When I first finished the install, the rear end of my truck was about 3” higher. I was afraid it would be too much, but after a couple days of driving, the springs settled some. I would say it lifted my truck about 1 1/2” total. Along with cranking the torshion bars up front, my truck has the factory look again, with a little more room for bigger tires when these wear out. Wish I had a better before picture but I didn’t think of it. The second picture is right after the install, the last picture is after a week of driving it.