The Complete Guide to Big Tex GN14 Trailer Suspension Parts

The Big Tex GN14 is a popular gooseneck utility trailer known for its durability and versatility. Whether you use it for hauling equipment, materials, or towing a camper, maintaining its suspension is critical for safety and performance. Over time, leaf springs, hangers, shackles, U-bolts, and bushings can wear out or break. This guide covers the most common suspension parts for the Big Tex GN14, how to identify them, and what to consider when replacing or upgrading.

Understanding the GN14 Suspension System

The Big Tex GN14 typically uses a leaf spring suspension with a capacity that varies by model year and configuration. The most common setup is a slipper spring or double-eye leaf spring design, paired with a hanger and shackle system. Key components include:

• Leaf springs: The main load-bearing component. Common sizes are 2-inch wide leaves, often with a length around 25 to 28 inches, depending on the axle capacity (e.g., 3,500 lb or 5,200 lb).
• Hangers: Brackets that attach the front eye of the leaf spring to the trailer frame.
• Shackles: Connect the rear eye of the leaf spring to the frame, allowing movement.
• U-bolts: Wrap around the axle and spring assembly to secure them together.
• Bushings: Pressed into the spring eyes and shackles to reduce friction and wear.

Common GN14 Suspension Parts and Compatible Replacements

Leaf Springs

The GN14 often comes with 3,500 lb or 5,200 lb capacity leaf springs. For a 3,500 lb axle, the spring will typically have a 2-inch width and a length of 25-1/4 inches center-to-center (measured from the front eye center to the shackle pin center). For 5,200 lb axles, the spring might be 26-1/2 inches or longer. When replacing, match the original spring eye type (double-eye or slipper) and capacity. Many aftermarket springs from brands like Dexter, Trailer-Aid, or UtilityTrailerParts.com will fit, but verify the exact length and bushings.

Hangers and Shackles

Hangers are usually bolted or welded to the frame. The GN14 uses a bolt-on hanger with a 3-1/4 inch drop (distance from frame to spring eye). Shackles are typically 3-1/4 inch center-to-center with a 1/2-inch diameter pin. Both parts are available in galvanized or painted steel. Upgrading to heavy-duty shackles with grease zerks can extend bushing life.

U-Bolts

U-bolts must match the axle tube diameter and spring width. For a 3,500 lb axle with 2-inch wide springs, a common U-bolt is 7/16 inch diameter with 4-1/2 inch inside width and 6-inch length. For 5,200 lb axles, 1/2 inch diameter U-bolts are typical. Always use new U-bolts with fresh nuts and lock washers.

Bushings

Bushings wear out and cause slop. The GN14 uses a 1/2-inch inner diameter bushing for most shackle and hanger pins. Bronze or plastic bushings are common. Upgrade to PTFE-lined or polyurethane bushings for longer life.

How to Identify the Correct Parts

To find the right suspension parts for your Big Tex GN14, you need to:

1. Check the trailer’s VIN or build date – Newer models may have different spring lengths or hanger designs.
2. Measure the existing parts – For leaf springs, measure the length from the center of the front eye to the center of the rear eye (or the end of the slipper). Count the number of leaves and note the thickness.
3. Inspect the hanger and shackle – Measure the drop height of the hanger and the center-to-center distance of the shackle.
4. Look for axle capacity – It’s often stamped on the axle tag. This helps determine spring capacity.

Many online retailers offer a “Big Tex GN14 suspension kit” that includes springs, hardware, and bushings. These kits simplify ordering.

Upgrading vs. Replacing Stock Parts

If your GN14 is used for heavy loads or off-road, consider upgrading from OEM to heavy-duty parts:

• Heavy-duty leaf springs – Add extra leaves or use a multi-leaf pack with more rated capacity (e.g., from 3,500 to 5,200 lb).
• Greaseable shackles and hangers – Allow periodic lubrication to reduce wear and squeaking.
• Polyurethane bushings – More durable than rubber and resist deformation.

However, overloading the axle beyond its rated capacity is unsafe. Always stay within the axle and tire ratings.

Installation Tips for DIYers

Replacing suspension parts on a Big Tex GN14 is a moderate DIY job if you have basic tools: a floor jack, jack stands, wrenches, and a pry bar. Safety first: support the trailer with stands on the frame, not the axle. Here’s a brief outline:

1. Remove wheel and tire.
2. Support the axle with a jack.
3. Remove U-bolts and old springs.
4. Remove hanger and shackle bolts – may require penetrating oil on rusted bolts.
5. Install new bushings into the spring eyes and shackle.
6. Attach spring to hanger and shackle loosely.
7. Position axle and install new U-bolts – tighten to manufacturer torque (typically 20-30 ft-lbs for 7/16, then final torque after lowering trailer).
8. Lower trailer and torque U-bolts to final spec (e.g., 50-60 ft-lbs).

If you’re unsure, consult a trailer service shop.

Where to Buy Big Tex GN14 Suspension Parts

While we don’t recommend specific marketplaces, you can find OEM and aftermarket parts at:

• Local trailer dealers (often stock Big Tex parts)
• Farm and ranch supply stores
• Online trailer parts retailers (search for “Big Tex GN14 leaf springs”)

Compare pricing and shipping costs. Always confirm part numbers with the seller.

Final Recommendation

For most Big Tex GN14 owners, replacing worn suspension parts with OEM-spec components is sufficient. If you tow near the maximum load or over rough roads, consider upgrading to heavy-duty springs and greaseable shackles. Always inspect bushings and U-bolts annually. A complete suspension kit for the GN14 (including springs, hardware, and bushings) typically costs $150–$300 and can be installed in an afternoon. Prioritize safety: if in doubt, have a professional do the work.