Increasing Clearance Between Frame and Axle on a Boat Trailer

Question:

I have only 3/4clearance between trailer frame and axle when boat is on trailer. what do I need to do to get more clearance 3500lb axle

asked by: Bob G

Expert Reply:

An unloaded trailer should have between 2 and 2-1/2 inches of clearance between the frame and the axle. Typically trailer leaf springs have a maximum deflection of 1-1/2 inches. First, I recommend checking your leaf springs. If they have some age on them, they may have flattened out and need to be replaced.

If you find that your springs are still in good condition, there are a few other routes you could take to give yourself more clearance between the frame and axle. If the axle on your trailer is round, you could use an over under kit, like part # K71-384-00, to flip your axle. This over under kit fits 2-3/8 inch axles and double-eye springs. An over under kit will increase the clearance by a height equal to the diameter of the axle plus the thickness of the leaf spring.

Another option would be to have longer hangers put on your trailer. The longest hangers we carry are 3-5/8 inches tall, # 29-31, or 4-1/4 inches tall, # E4139. Increasing the hanger height won't necessarily provide an equivalent ride height increase. These are welded onto your trailers frame. We recommend having new hangers welded on by a qualified professional. The new hangers can be welded in the same place as the old hangers were mounted.

expert reply by: Victoria B