ZONE OFFROADC6159 Add-a-Leaf Kit

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.

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 am very happy with this product and I highly recommend it for your nnbs Silverado/Sierra! I was able to install both leafs in about 2.5 hours taking my sweet time. All you need are some large c clamps and basic mechanics hand tools. I left the factory blocks and the ride height looks just about perfect (see before and after pics) with the 2" leveling kit I have up front. The quality of this kit is seriously impressive for the price. Ride quality is a bit stiffer, but the truck still rides very nicely - I actually prefer the ride after the install. Hope that helps someone out!

Very happy, needed to raise the weight rating on my chevy express 1500, because back was sagging if I hauled even a bag of groceries. This plus a 2.5" block was what I wanted/needed. Now it's bout 4" higher (39" from the ground with original tires @35psi) ; didn't care how much was before. Not easy to install, if you don't know/don't have space to work, you might be in trouble. Use 2 jacks (plus one to jiggle the axle) and you're good.Take in consideration:- I wasn't able to use the clamps, were too narrow.- don't force the centering pin, threads are good (small step) but it's soft material.- both leaves had ends that were off, sticking out a bit on the sides, center was good(maybe on silverado will fit better), I read another guy saying that here. Nothing major though.Overall, I'm happy with the purchase. 4.5/5* because of small things that could've made life/install easier).

I have purchased several add a leafs recently and this was the best of them. Long leaf so it did not put a strain on the other leafs wich would risk snapping them. The added spring retainers are a really great addition and I did use them. I would recommend putting some thin rubber under them like from an inflatable inner tube. Added the hight advertising and firmed the suspension but not too stiff. I used them to replace a leaf on my 74 dodge charger so they were by no means an exact fit for my vehicle but they still worked great

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.

Traded the truck on a whim while the package was in transit but I can’t see a more cost effective way to combat trailer sag in a lifted/leveled 1/2 than this

Was Farley easy to install just make sure u have at least a 6 in clamp 8 would be great an always make sure you retight your u bolts after a few miles 😉