U-Bolt Kit and Bracket for a 3" Trailer Axle

Updated 11/25/2024 | Published 11/22/2024

Question:

Do you carry suspension brackets and U-Bolts for 8K - 3 round axels X7

asked by: Kyle S

Expert Reply:

Hey Kyle,

We do! What you're looking for is the U-Bolt Kit # APUBR-9 which comes with 7-1/16" long U-Bolts that are 3" wide on the inside so they'll work perfect for you!

expert reply by: Jon G

Kyle

11/22/2024

Do you carry 8K rated ubolts?

Jon G.

11/22/2024

@Kyle The U-Bolts themselves don't have a specific weight rating - we just list them out for their typical applications. As long as your 8K axles have a 3" diameter this U-Bolt kit will work great!

Kyle

11/22/2024

I am in the process of ordering the Roadmaster Comfort Ride Leaf Spring Suspension Kit w/ Shocks - Triple 8K, 3" Trailer Axles - 2019 Grand Design Momentum 381M. Part Number: RM-2460-2580-3. Is there any difference between the Roadmaster - 8K - 3" and the 3.5" suspension kit? What U-bolts would I need to complete the installation for 3" axles? What other parts are needed to complete the installation? Can you send me a list of all the parts are needed? Also, can you send me a link to the tire's lug nuts to replace them. Thanks.

Jon G.

11/25/2024

@Kyle The only difference between those Comfort Ride systems is going to be the bracket that sits on top of the leaf spring where the U-Bolts attach. The bolt holes will have to be in a slightly different location to fit with a 3-1/2" axle as opposed to a 3" axle. The U-Bolt Kit # APUBR-9 I referenced initially will work for the 3" axle kit. Aside from the tools needed to complete the installation, the 3" Axle Kit # RM-2460-2580-3 comes with all the parts you need to get everything installed. You'll just either need to reuse your old U-Bolt kit or use the one I referenced above. Here is a list of the parts Roadmaster rays you need to get the installation done: - General hand tools - 21/64" drill bit - Torque wrench - Loctite Red - Center punch - 12” long, 5/16” drill bit - 9/16” socket and wrench - 3/4” socket and wrench - Blue threadlocker When it comes to your lug nuts, you likely have 9/16" lug nut on your trailer so you'll need part # 6-53 to replace them, but I do recommend verifying this on your end as well prior to purchasing.