How do I identify my Ford leaf springs?
To identify Ford leaf springs, locate the rear leaf-spring pack under the axle, count the leaves, measure the eye-to-eye length, inspect any identification stamps or part numbers, and cross-check with Ford’s parts catalog or your vehicle’s axle code. The exact configuration varies by model and year, so confirming the axle type and part number is essential for accurate identification.
Where to find Ford leaf springs and what to look for
Ford leaf springs are typically mounted under the rear of trucks and some SUVs, attached to the axle with U-bolts and spring perches. The spring pack is a stack of curved steel leaves held together by a clamp or bolt at the front (master leaf) and connected to the frame with a shackle at the rear. Identifying them involves locating the pack, counting leaves, and checking for markings that tie to a specific part number or model.
Use this step-by-step guide to locate and identify the leaf-spring pack on a Ford, count its leaves, and measure its key dimensions.
- With the vehicle safely supported, locate the rear leaf-spring pack mounted under the axle. Look for a stack of curved metal leaves bound together and attached to the frame via a front mount and rear shackle.
- Count the number of leaves in the pack. Foam spacers or helper leaves may be present; note the total count and which leaf is the master leaf (the thickest and typically widest leaf at the top).
- Check the geometry: note the orientation of the eyes (the holes for the bushings) and whether the pack ends in a clamp or a pinned connection. This helps differentiate common Ford configurations.
- Measure eye-to-eye length (the distance between the centers of the front and rear spring bushings) and the overall free length of the pack. Record approximate measurements for reference when matching parts.
- Inspect for markings: look for stamped numbers or letters on the leaves, especially on the master leaf, and any tags or plates attached to the pack. Ford part numbers or codes often appear here and can be used to verify the exact spring model.
- Examine the bushings and shackles for wear or modifications. Worn bushings or aftermarket shackles can indicate non‑OEM springs or an updated suspension setup.
- Note any aftermarket modifications: lifted trucks, load airbags, or add‑a‑leaf kits can change the pack’s leaf count, length, or geometry. Document any such changes before buying replacements.
- Cross‑check your findings with official sources: Ford’s parts catalogs, dealer websites, or the owner’s manual can confirm the exact spring model for your year and model when you share the leaf count, length, and any stamped codes.
Identifying the spring pack in this way helps you verify compatibility before ordering replacements or planning upgrades. If your vehicle has aftermarket components, the identification may point to a non‑stock spring arrangement that requires different parts or fabrication considerations.
Reading the markings and identifying codes
Leaf springs commonly carry markings that indicate the part number, manufacturing date, and sometimes the intended vehicle model. Reading these markings correctly is key to precise identification.
- Master leaf and individual leaves often carry stamped part numbers or Ford manufacturing codes. Look for a line of numbers or alphanumeric strings on the top or side of the leaves.
- A tag or plate may be attached to the spring pack with the part number, date, and factory information. If present, photograph the tag for reference.
- Painted or etched codes near the eyelets or along the edge of the leaves can indicate the spring group or axle pairing. Note the color and any letters/numbers you find.
- Don’t rely on color alone. Some OEM packs use the same color for multiple applications; always cross‑reference codes with official Ford references or the VIN/axle data.
Once you’ve captured markings, you can use Ford’s official catalogs or reputable parts databases to confirm the exact spring model, including the number of leaves, overall length, and compatibility with your vehicle’s year and trim.
Using the VIN and axle code to confirm
Your vehicle’s VIN and the associated axle code can narrow down the exact spring configuration, especially if multiple Ford configurations exist for a given model year.
- Find the VIN: typically located on the driver’s side dash (visible through the windshield) or on the driver’s door jamb plate. Write it down exactly as shown.
- Locate the axle code: on the door jamb plate or in the glove box literature, Ford often lists an axle code that corresponds to the ring-and-pinion ratio and the type of rear suspension, including leaf springs.
- Use Ford’s VIN/axle decoder or an official parts catalog to map the VIN/axle code to the correct spring: enter the year, model, and axle code to retrieve the exact leaf-spring part number and compatible configurations.
- Cross‑check the results against the spring pack you’ve identified in steps above (leaf count, length, and markings). If everything aligns, you’ve confirmed the correct spring model.
- If uncertain, contact a Ford dealer or a qualified mechanic with your VIN and photos of the spring pack for a definitive match.
Decoding VIN and axle codes is a reliable way to confirm the correct spring configuration, particularly for older models or trucks with multiple factory options. It reduces the risk of ordering the wrong part when shopping for replacements or upgrades.
Safety and maintenance checks
Identifying your leaf springs is just the first step. A quick safety and maintenance check can prevent issues before they arise and keep your suspension performing as intended.
- Perform the work with the vehicle on a flat surface and securely supported on jack stands. Never crawl under a vehicle supported only by a jack.
- Inspect for cracked, split, or severely rusted leaves, which indicate replacement is needed.
- Check the spring pack for gaps between leaves or loose clamps, indicating wear or improper alignment.
- Inspect U‑bolts, spring plates, and shackles for wear, misalignment, or damage. Replace worn hardware as needed.
- Document any aftermarket modifications, as these can affect identification and compatibility with stock parts.
Regular inspection helps catch issues early and ensures that the identified spring configuration remains appropriate for your vehicle’s weight and use, whether for daily driving, towing, or off‑roading.
What to do next
With the identification steps completed, you can confidently purchase the correct spring pack, determine whether an OEM replacement or an aftermarket option best suits your needs, and plan any related suspension work.
- Use the part number, length, leaf count, and axle compatibility to select the correct spring from a Ford dealership catalog or trusted aftermarket supplier.
- If upgrading, consider how the new spring’s load rating and arch will affect ride height and ride quality, and whether additional components (shackles, bushings, U‑bolts) are required.
- Schedule professional installation if you’re not comfortable performing suspension work yourself, and have alignment checked after installation if necessary.
Careful identification now saves time and money later by ensuring you get the right spring configuration for your Ford model and its intended use.
Summary
Identifying Ford leaf springs hinges on locating the rear spring pack, counting leaves, measuring length and eye spacing, and reading any stamps or tags. Cross-check these details with the vehicle’s VIN/axle code and Ford’s official catalogs to confirm the exact part number and compatibility. Always factor in any aftermarket modifications and prioritize safety when inspecting or replacing suspension components. If you’re unsure, consult a dealer or certified mechanic to verify the correct spring configuration for your specific Ford model and year.
