As a parts supplier specializing in leaf springs for FAW trucks, I get this question at least three times a week—usually from fleet managers upgrading their old FAW J6 models, new truck buyers cross-checking part specs, and even independent mechanics who’ve been burned by generic aftermarket springs that don’t hold up to FAW’s rigorous performance standards. The short answer is it depends on two key factors: the specific FAW model the leaf spring is built for, and the load requirements the truck is designed to handle. But let’s dive into the details that matter, because grabbing a “one size fits all” leaf spring set will only lead to unnecessary breakdowns or overspending down the line. Leaf Spring for FAW
First, I need to ground this in FAW’s official part catalogs because that’s the baseline for every set we supply. I don’t guess—every spring we ship is engineered to match FAW’s original equipment (OE) tolerances, which is why our repeat customers include long-haul fleets and local delivery companies that can’t afford downtime. For context, FAW (First Automobile Works, for anyone who might not be familiar with the Chinese heavy-duty truck giant that’s been a global leader for over 60 years) designs leaf spring sets based on axle load capacity and application, not just a random number of leaves.
Let’s start with the most common FAW models our customers ask about. The FAW J6P 6×4 tractor, one of the best-selling heavy-haul trucks in China and across Southeast Asia, uses two leaf spring assemblies: one for the front axle and one for the rear drive axles. The front axle set—designed for a gross axle weight rating (GAWR) of around 7 tons—usually has 4 to 5 leaves. These are thinner, more flexible leaves that balance handling when the truck is unloaded, so it doesn’t ride like a brick on empty backroads. The rear axle set for the J6P 6×4 is where most people get confused: it’s a multi-stage set that combines progressive and parabolic leaves to handle varying loads. For the standard 13-ton GAWR per rear axle, that set has 7 to 9 leaves total. Wait, but we also do reinforced versions for fleets that regularly carry overloaded cargo (even if that’s not ideal, we build to their specs) which add an extra 2 to 3 main leaves to handle the extra torque.
Then there’s the FAW JH6, another super popular model for long-haul and container transport. The JH6’s front axle uses a slightly stiffer 5-leaf set, since it often pulls heavier trailers with extra weight on the front pin. The rear tandem axle set for the JH6 is a 9 to 11 leaf progressive set—this is the set we sell the most of, because container transport means consistent heavy loads, and that extra leaf count keeps the suspension aligned even after 100,000 km. For the FAW J7, FAW’s flagship Class 8 truck for North American markets, the rear axle sets jump to 10 to 12 leaves, because those trucks are built to pull 80,000 lbs loads over cross-country highways, so the leaf stack needs extra thickness and support to avoid sagging.
I should also mention light- and medium-duty FAW models, because we supply those too for local delivery and construction. The FAW Ranger 4×2 light truck has a 3-leaf front set and a 5-leaf rear set—simple, cost-effective, and built for urban stop-and-go loads. For the FAW GL 8×4 dump truck, which hauls construction materials, the rear axle sets are much heavier duty: 12 to 14 leaves, plus a heavy-duty helper leaf that engages when the dump bed is fully raised and loaded with dirt or gravel. That helper leaf is often the one people miss when buying cheap aftermarket parts—skip it, and the spring will crack after a few dozen heavy hauls.
Now, why does the leaf count matter beyond just fitting? FAW designs leaf springs as a system, not individual leaves. Each leaf is shaped (we call that camber) to work with the others—when you add or remove a leaf, you throw off the load distribution, stress points, and ride height. For example, if a J6P rear spring is supposed to have 8 leaves, and someone buys a set with only 6, the main load-bearing leaves will flex too much when the truck is fully loaded, leading to premature fatigue and a higher risk of the spring breaking mid-drive. We had a customer last year who tried to save $100 on a generic set for their JH6, and within three months, a rear leaf snapped on a highway, causing a $5,000 accident that would’ve been avoided with the correct FAW-spec set. A lot of new fleet managers don’t realize that FAW’s part numbers directly tie to the leaf count—so referencing the VIN or existing part number is the fastest way to get the right set.
I also want to clear up a common myth: more leaves don’t always mean a better spring. Parabolic springs, which are becoming more common on newer FAW models, use fewer, thicker leaves (usually 5 to 7) that are tapered along their length to reduce weight while maintaining load capacity. These are different from the old multi-leaf tapered springs, and they’re actually more efficient for fuel economy, since they’re lighter. For example, the 2022+ FAW J6P uses parabolic rear springs with only 6 leaves, which replaced the old 9-leaf multi-leaf set, and our customers report 3-4% better fuel mileage as a result, plus smoother rides. But even with parabolic sets, the leaf count is specific to the model and load—we don’t sell a parabolic set for a J6P that has 4 leaves, because that would be too soft for highway hauling.
As a supplier, I’ve spent the last 8 years working closely with FAW’s R&D team to update our stock inventory, so we carry sets for over 90% of FAW models sold globally. When a customer reaches out, the first thing I ask is their FAW model, axle type, and typical load weight—because that lets me confirm exactly how many leaves are in the correct set, instead of sending a one-size-fits-all that doesn’t work. I also offer reinforced sets for extreme use cases, like mining trucks or logging haulers, which can have 15 or more leaves to handle 20+ ton loads, but those are custom orders, not standard stock.
Now, if you’re a fleet manager or truck owner looking for accurate specs, here’s a quick cheat sheet to reference:
- Light-duty FAW (Ranger, V-series): Front = 3 leaves, Rear = 5 leaves
- Medium-duty FAW (J5, J6L): Front = 4 leaves, Rear = 7-8 leaves
- Heavy-duty FAW (J6P 6×4, JH6): Front = 5 leaves, Rear = 8-9 leaves (standard) / 10-11 leaves (reinforced)
- Flagship FAW (J7): Front = 6 leaves, Rear = 10-12 leaves
- Newer parabolic models (2022+ J6P, JH7): Front = 5 leaves, Rear = 6 leaves
This is all based on FAW’s official OEM specs, so every set we supply is precision-cut and heat-treated to match those dimensions, not mass-produced with cheap steel that warps after a few months. We also offer a 12-month warranty on all FAW leaf spring sets, which is something generic parts can’t match.
If you’re tired of dealing with aftermarket parts that don’t hold up to your FAW truck’s needs, or you’re planning a fleet upgrade and need to stock the right spring sets for service teams, reach out to discuss your requirements. We can provide exact part numbers, custom reinforced options, and bulk pricing for fleets.
Rubber Bushing References:
FAW Truck Official Parts Catalog 2023
SAE International Technical Paper on Heavy-Duty Leaf Spring Design for Commercial Vehicles
China Automobile Engineering Society Report on Suspension Performance for FAW Commercial Trucks
Henan Talen Auto Parts Co., Ltd.
As one of the most professional leaf spring for faw manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy durable leaf spring for faw made in China here from our factory. For price consultation, contact us.
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