How to Pick Out Replacement Slipper Springs for a Boat Trailer with 2 inch Square Axles

Question:

I currently have a single axle trailer for a 17 ft mckeecraft the springs measure 28 inch oal they are slipper bent up. dont know if they rub on the top or a bushing that is bolted to the back hanger. 5 leaf 1 3/4 wide . centerline of bolt to center of bushing is 25 5/8 one side 25 3/4 other. bolts look like 1/2 13 is that ok to use on the c4 9/16 hole or would you drill the hanger bigger to fit a 9/16 fastener and do you offer those ? measuring from the center of the eye bushing diagonaly to the center of the pin is 13 3/8 to 1/2 and from the top of the plate to the bottom of the trailer it is about 3 3/4 inches. it is a 2 to 2 1/8 square axle tube and the hold down plate is heavy about 1/4 inch thick. is the c4 the proper replacement? boat and trlr are about 3600# also want u bolts hold down plates and proper hardware for bushings thank you , ps all mesurments were taken loaded sitting in driveway

asked by: Eric

Helpful Expert Reply:

In order to pick out springs you need to remove the load on the trailer so that the leaf spring is not flattened out at all. You will want to measure from the center of the eye of the spring to the center of where the slipper spring contacts the hanger.

If that distance is 26-1/4 inches and the capacity of the axle is 4,100 lbs the # e33SR would fit and work well.

The bushing of this spring is 9/16 inch in diameter. You will want to use a 9/16 inch diameter bolt so you can either premeasure yours to ensure you have 9/16 and/or replace with the # 34007-187-00 for a correct size bolt.

For 2 inch square axle u-bolts you would need the part # SP01-160. Then for a plate you would need part # 117594-G.