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How to Determine Correct U-Bolt Kit and Leaf Spring Bushing for a 6,000 Lb Trailer Axle


Hello , I have a 35 foot 5th wheel with 6000# axles I need a U bolt and nut and spring bushings , how do I determine the correct bushings, and will they install without a press also , u bolt size . Thanks ,


Helpful Expert Reply:

A 6,000 lb axle is usually going to be 3" in diameter. Therefore, for the u-bolts you can use part # APUBR-8 for 7" long or part # APUBR-9 for 7-1/4" long. You can measure your existing u-bolts or from the bottom of the axle to the top of the leaf spring pack in order to determine which length you need. You can always choose the longer option and cut away any remaining threads if necessary.

Most leaf springs for 6,000 lb axles are 1-3/4" wide and will use a 9/16" bolt. If this is the case then you can use part # TRBU11566 for the replacement bushings. You will not need to use a press to install the bushing. If you need help you can take a look at the install video I have attached for you. There is also an install video attached of how to install the u-bolts as well.

helpful expert reply by:
Conner L

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