If you're looking to give your classic Chevy a better stance, picking up a 67 72 c10 lowering kit 4 6 is probably the most popular way to do it. Let's be honest, those old Action Line trucks look incredible from the factory, but they also tend to sit way too high. They've got that "stinkbug" look with the back end way up in the air, or they just look like they're ready to go off-roading. A 4/6 drop—meaning four inches of drop in the front and six inches in the rear—is widely considered the "sweet spot" for these trucks. It's low enough to look aggressive and custom, but not so low that you're scraping every pebble on the pavement.
Why This Specific Drop Works So Well
The reason most guys go for the 67 72 c10 lowering kit 4 6 is that it levels the truck out perfectly. From the factory, these C10s usually had a significant rake. By dropping the back two inches more than the front, you end up with a profile that's nice and level with the ground. It completely changes the silhouette of the truck. Instead of looking like a farm utility vehicle, it starts looking like a muscle truck.
Another thing to consider is that at this height, you can still actually use the truck. You can drive it to car shows, take it on a road trip, or even haul a light load if you've got the right helper bags. Once you go lower than 4/6, you're looking at bagging the truck or dealing with some pretty serious clearance issues that make daily driving a headache.
Breaking Down the Front Components
When you're looking at the front of a 67 72 c10 lowering kit 4 6, you usually have two main ways to get that four-inch drop. Most people will tell you—and I agree—that the best way is a combination of drop spindles and lowering springs.
Typically, you'll run a 2-inch drop spindle and a 2-inch lowering spring. The beauty of the drop spindle is that it moves the wheel pin up without changing the suspension geometry. That means your control arms stay at their factory angles, which keeps your ride quality decent and makes it much easier to get a proper alignment. If you try to get all four inches of drop just by using springs, you're going to have a bad time. The springs will be incredibly short, the ride will be bouncy, and your alignment shop will probably hate you because they won't be able to get the camber right.
Getting the Rear Sitting Right
The back of the truck is where the real transformation happens. A six-inch drop in the rear is a big jump. On a 67-72 C10, you're usually dealing with a trailing arm suspension (though some came with leaf springs). Most kits for these trucks use a combination of lowering springs and a "flip kit" or specialized blocks and shackles depending on the specific setup.
With a six-inch drop, you're really tucking those rear tires up into the wheel wells. It gives the truck that "planted" look. But because you're moving the axle six inches closer to the frame, you have to think about clearance. This is where things get a little more involved than just swapping out some bolts and springs.
Do You Really Need a C-Notch?
Short answer: Yes. If you're installing a 67 72 c10 lowering kit 4 6, you absolutely need a C-notch in the rear. If you don't install one, you'll only have an inch or two of travel before your axle hits the frame. Every time you hit a speed bump or a pothole, it'll feel like the truck is falling apart.
A C-notch is basically a reinforcement plate that requires you to cut a half-circle out of your frame rails right above the axle. It sounds scary to cut into your frame, but most modern kits are "bolt-in" and come with heavy-duty steel plates that end up making that section of the frame stronger than it was before. It's a bit of extra work, but it's the difference between a truck that's fun to drive and one that's a nightmare.
Choosing the Right Shocks
Don't make the mistake of using your factory shocks with a lowering kit. They're simply too long. If you try to use them, they'll be fully compressed (bottomed out) while the truck is just sitting in the driveway. You need "drop shocks" that are specifically designed for the shorter travel of a lowered suspension.
Good shocks are what make the difference between a truck that handles like a modern sports truck and one that bounces down the road like a pogo stick. A lot of the 67 72 c10 lowering kit 4 6 packages come with shocks included, which is usually the way to go because the manufacturer has already matched the valving to the spring rates in the kit.
Installation Tips and Tricks
If you're planning on doing this in your driveway, give yourself a full weekend. It's not necessarily "hard" work, but these trucks are over 50 years old. You're going to run into rusty bolts, stubborn rivets, and probably some old grease that's turned into concrete.
One of the biggest hurdles is often the factory rivets holding the original brackets in place. You'll want a good grinder, a high-quality drill bit, or even an air chisel to get those out. Also, while you have everything apart to install your 67 72 c10 lowering kit 4 6, it's a great time to look at your bushings and ball joints. There's no sense in putting a nice lowering kit on a truck that has dry-rotted rubber bushings and loose ball joints. Swapping those out at the same time will make the truck feel brand new.
Wheels, Tires, and Clearances
Once the truck is sitting four inches lower in the front and six in the back, your choice of wheels and tires becomes very important. You can't just throw any old offset on there and expect it to clear the fenders.
For the front, most guys find that a 245 or 255-width tire on an 8-inch wide wheel works well. In the rear, with that 6-inch drop, you can usually tuck a 275 or even a 295 if you have the right backspacing. Just remember that the lower you go, the more "tucked" the wheels will look. If you're running factory-style rallies, you might need some small spacers to get the look just right, but usually, the 4/6 drop is pretty forgiving with wheel fitment.
The Transformation Is Worth It
The first time you let the truck down off the jack stands after installing a 67 72 c10 lowering kit 4 6, you'll realize why this is such a popular modification. The change in attitude is instant. It goes from looking like a dusty farm relic to a sleek, classic cruiser.
It's one of those modifications that offers the most "bang for your buck" when it comes to aesthetics. Plus, because the center of gravity is lower, the truck will actually feel much more stable in the corners. You'll lose that "boaty" feeling where the truck leans over every time you turn the steering wheel.
Just remember to take your time, get a proper alignment as soon as you're done, and don't skip the C-notch. If you do it right, you'll have a C10 that turns heads everywhere you go while still being comfortable enough to drive every single day. It's the perfect balance of form and function for anyone who loves these classic Chevy trucks.