UFP Unique Functional Products

Trailer Buddy Replacement Trailing Arm w/ Vault 3,750 lb 5-Lug Hub #43038

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  • Regular price $ 175.28
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Trailer Buddy Replacement Trailing Arm w/ Vault 3,750lb 5-Lug Hub #43038

This replacement trailing arm works with all Trailer Buddy-UFP 3750lb. capacity torsion axles.  Mounts easily to the desired position by splines that allow for ride height adjustment.  The complete assembly is ready to be bolted on to existing torsion axle with mounting bolt (included).  Standard 4-Bolt brake flange integrates into the arm and allows for an instant upgrade for brakes.


  • Trailing arm and hub are zinc plated for superior corrosion protection
  • VAULT Maintenance-free hybrid oil hub requires no maintenance and is completely sealed
  • Tooth and Groove or Spline attaches easily to any 3750lb. UFP Torsion axle
  • 4-Bolt Brake Flange integrated into trailer arm
  • Mounting bolt, nut, and washer are included
  • Tapered spindle size is 1 3/8" x 1 1/16"
  • Bearings and Seal are pre-packed with VAULT Hybrid Oil
    • 68149 Inner Bearing and 44649 Outer Bearing
    • 1.68 ID Seal
  • VAULT hub cap seals the hub and maintains slight pressure in hub

UFP Torsion Axle end unit trailing arm with VAULT Hybrid oil pre-packed 5-Lug hub.

Customer Reviews

Based on 31 reviews
Rob S. (Boise, US)
axel repair

The replacement part went together beautifully and is working great, Just wish there was a way to remove the old part a little easier

Gilbert G. (Amarillo, US)
Just what I needed

Easy repair

Tiger H. (Oklahoma City, US)
Great company to do business with

This is the first time to have a small issue. Usually parts go right out. They had a disclaimer about shipment delays (Covid) so I didn't think much about it, but end up calling a week later to be told he could not explain why it did not get shipped. It was here in a matter of days. Overall I still love your company and look forward to doing more business with you. I highly recommend this company.

Jurgen D. (Rougemont, US)


Steve H. (Phoenix, US)
Trailer part buddy!

Box arrived after one week LA to AZ. Box was broken and ripped but product was ok, it was heavy and should have been packed better.
No instructions on installation?
How hard is it to remove the old one from the spline? Tool needed? Bought this as a spare as I travel from Idaho to Baja?

HOWEVER, Surgio was a ROCK STAR, super to deal with! My trailer was made by you guys and is has been eye candy for many boaters. I lock it with with super duty locks and a decal that says my sites hate thieves! Thank you

Clinton M.

Nice piece

Andre (Palm Springs, US)
Quality item

Item was sent out quickly and well packaged. I recently Bought a used boat and the trailer has some serious rust issues.
These were exact replacement fit. Quality item as described and For the price is a win win. Buy with confidence

Victoria S. (Rosemount, US)

Parts worked perfectly. A little bit longer thank hoped for delivery, however I understand due to Covid.

John I. (Anaheim, US)
Trailer parts

Little bit of trouble trying to get a hold of somebody to order parts

David C. (Dora, US)
Hubs easily replaced on my 03 Ranger 481vs Ranger Trailer

Took me 30 min to change both hubs out on my 03 Ranger boats trailer. Parts fit perfectly. Pacific trailers got my parts to me quickly and keep me informed where my package was through the entire process.