Looking for the best UFP trailer torsion arm assemblies? We offer a simple, easy-to-read selection that helps you choose the right fit for a smooth and steady tow.
Best UFP Trailer Torsion Arm Assemblies give you a smooth, steady tow every time. They help keep your trailer safe on the road.
You feel the firm hold right away. You trust the strong build. You enjoy the easy ride.
You see how each part fits well. You notice the clean, simple design. You feel ready to choose the right arm.
List of Top 10 UFP Trailer Torsion Arm Assemblies
| Image | Title | Best For | Price |
|---|---|---|---|
![]() |
UFP by Dexter Zinc Plated Vault Torsion Arm Idler Assembly 3.7 K, 43038 |
This product is perfect for anyone who needs a strong and reliable torsion arm idler. It is ideal for those looking for a durable and easy-to-install part to keep their vehicle’s suspension working smoothly. |
|
![]() |
UFP by Dexter Axle Complete Torsion Arm Kit |
This is perfect for trailer owners who want a new and strong torsion arm kit. It is also a great fit for people who want easy repair and smooth use. |
|
![]() |
UFP by Dexter Axle Complete Torsion Arm Kit |
This kit is perfect for people who want a strong, new, and easy-fit torsion arm for their trailer. It is great for anyone who needs a simple, safe, and smooth ride. |
|
![]() |
UFP by Dexter Trailing Arm Replacement Torsion Spindle Raw #36233 with Hardware |
This part is perfect for DIY trailer owners and auto repair pros who need a fast, solid fix for a worn trailing arm. It’s great for anyone who wants a strong, simple, and reliable replacement part. |
|
![]() |
UFP By Dexter Vault Torsion Arm with DB-35 Disc Brake Assembly, 3.7K, Lefthand #43039L |
This UFP by Dexter torsion arm with disc brake assembly is perfect for anyone needing a reliable, high-quality replacement part for their trailer or automotive setup. It’s ideal for left-hand applications and ensures smooth, safe braking performance. |
|
![]() |
UFP by Dexter Vault Torsion Arm with DB-35 Disc Brake Assembly, 3.7K, Righthand #43039R |
This is perfect for boat owners who need a strong right-hand torsion arm with reliable disc brakes. It is a smart fit for heavy-duty trailer use and safe, smooth stops. |
|
![]() |
Generic Torsion Spindle Arm for Ranger Boat Trailer Straight Spindle 4200#, 33261U |
This spindle arm is for Ranger boat trailers. It fits a straight spindle with a splined opening. You get a bolt to help you mount it. It uses a UFP part. You will need bearings and a seal. It is strong and new. It is perfect for your boat trailer. |
|
![]() |
43038U Fits for UFP DB35 End Unit 3.7K Idler Arm w/Spindle for Vault Hub Bearings, for Boat Trailer Axle – Trailer Torsion Axle Trailing Arm Idler Assembly Replacement |
This product is perfect for boat owners who want a strong, ready-to-install trailer axle arm that keeps their ride smooth and safe. It’s great for anyone who needs a simple, reliable replacement part with no extra work. |
|
![]() |
Trailer RV 3.7 K Vault Torsion Arm w/DB-35 Disc Brake for UFP |
This kit is for people with a trailer. It is best for those who tow. It helps you stop fast and gives a smooth ride. It fits well and keeps your drive safe. Use this to fix your RV. It is strong and lasts a long time. Buy it for your axle. |
|
![]() |
DB35 End unit 3.7K Trailer Idler Arm w/Spindle Vault Hub Bearings |
This is perfect for boat trailer and RV camper owners who need a strong, easy-fit idler arm with Vault hub bearings. It is also a smart pick for anyone who wants a simple fix for a 3,750 lb axle setup. |
Detailed Reviews
This guide shows the Best UFP Trailer Torsion Arm Assemblies with clear facts and real value. We look at fit, strength, and smooth ride so you can choose with confidence. Read on to find the right part fast.
1. UFP by Dexter Zinc Plated Vault Torsion Arm Idler Assembly 3.7 K, 43038

Fix your trailer now. This strong steel part holds big loads. It keeps your ride smooth.
The bright zinc stops rust fast. It is built to last for long trips. You get top strength for your rig.
Buy this part and hit the road. Tow your load with no stress.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This product is perfect for anyone who needs a strong and reliable torsion arm idler. It is ideal for those looking for a durable and easy-to-install part to keep their vehicle’s suspension working smoothly.
Ready to Purchase?
2. UFP by Dexter Axle Complete Torsion Arm Kit

This new kit is great. It fits your trailer well.
It is strong and safe. You can fix your axle now.
The parts are high quality. They stay tough for a long time. You will like this tool.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This is perfect for trailer owners who want a new and strong torsion arm kit. It is also a great fit for people who want easy repair and smooth use.
Ready to Purchase?
3. UFP by Dexter Axle Complete Torsion Arm Kit

This is a new torsion arm kit from UFP by Dexter Axle. It gives your trailer a smooth and stable ride.
The kit is complete and ready to install. It fits many trailer models. It is built to last.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This kit is perfect for people who want a strong, new, and easy-fit torsion arm for their trailer. It is great for anyone who needs a simple, safe, and smooth ride.
Ready to Purchase?
4. UFP by Dexter Trailing Arm Replacement Torsion Spindle Raw #36233 with Hardware

This trailing arm spindle is built for smooth, steady performance. It fits with ease and keeps your trailer moving right.
It comes with strong hardware. It installs fast. It lasts long.
The raw torsion design adds steady support. It helps reduce wear. It keeps your ride stable.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This part is perfect for DIY trailer owners and auto repair pros who need a fast, solid fix for a worn trailing arm. It’s great for anyone who wants a strong, simple, and reliable replacement part.
Ready to Purchase?
5. UFP By Dexter Vault Torsion Arm with DB-35 Disc Brake Assembly, 3.7K, Lefthand #43039L

The UFP by Dexter Vault Torsion Arm is a reliable automotive part. It comes with a DB-35 disc brake assembly.
This torsion arm is designed for lefthand use. It has a 3.7K capacity. The part number is ST-UFP43039L.
It is a durable and sturdy component. The brake assembly ensures safe stopping power. This product is easy to install.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This UFP by Dexter torsion arm with disc brake assembly is perfect for anyone needing a reliable, high-quality replacement part for their trailer or automotive setup. It’s ideal for left-hand applications and ensures smooth, safe braking performance.
Ready to Purchase?
6. UFP by Dexter Vault Torsion Arm with DB-35 Disc Brake Assembly, 3.7K, Righthand #43039R

This torsion arm is built for smooth, steady control. The DB-35 disc brake gives strong, clean stopping power. It fits 3.7K right-hand setups with ease.
It is made by UFP by Dexter for reliable use. It keeps your trailer moving with simple, solid performance.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This is perfect for boat owners who need a strong right-hand torsion arm with reliable disc brakes. It is a smart fit for heavy-duty trailer use and safe, smooth stops.
Ready to Purchase?
7. Generic Torsion Spindle Arm for Ranger Boat Trailer Straight Spindle 4200#, 33261U

Your boat trailer needs this part. It is a spindle arm. Make your rig safe today.
This arm fits Ranger boat trailers. It is built for a straight spindle.
Order your part right now. Get back on the road fast.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This spindle arm is for Ranger boat trailers. It fits a straight spindle with a splined opening. You get a bolt to help you mount it. It uses a UFP part. You will need bearings and a seal. It is strong and new. It is perfect for your boat trailer.
Ready to Purchase?
8. 43038U Fits for UFP DB35 End Unit 3.7K Idler Arm w/Spindle for Vault Hub Bearings, for Boat Trailer Axle – Trailer Torsion Axle Trailing Arm Idler Assembly Replacement

Upgrade your boat trailer with top strength. This idler arm assembly keeps your ride smooth. It fits UFP DB35 units with ease.
It handles 3,750 pounds of total load. The Vault system needs no maintenance at all.
You get a full set ready to install fast. Enjoy smooth towing on every single trip.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This product is perfect for boat owners who want a strong, ready-to-install trailer axle arm that keeps their ride smooth and safe. It’s great for anyone who needs a simple, reliable replacement part with no extra work.
Ready to Purchase?
9. Trailer RV 3.7 K Vault Torsion Arm w/DB-35 Disc Brake for UFP

The Trailer RV 3.7 K Vault Torsion Arm gives your trailer a firm, steady hold. It helps cut shake and shift on the road. You get a safer tow every time.
It is made with strong, rust-resistant parts. It is built for hard use and long life.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This kit is for people with a trailer. It is best for those who tow. It helps you stop fast and gives a smooth ride. It fits well and keeps your drive safe. Use this to fix your RV. It is strong and lasts a long time. Buy it for your axle.
Ready to Purchase?
10. DB35 End unit 3.7K Trailer Idler Arm w/Spindle Vault Hub Bearings

The DB35 End Unit is a 3,750 lb trailer idler arm with a Vault Hybrid Hub and bearings. It fits 5 on 4.5″ bolt patterns and has no brakes — perfect for boat trailers.
It meets original factory standards for safety. You get reliable protection for your trailer. This is a low-cost way to restore your RV or camper.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This is perfect for boat trailer and RV camper owners who need a strong, easy-fit idler arm with Vault hub bearings. It is also a smart pick for anyone who wants a simple fix for a 3,750 lb axle setup.
Ready to Purchase?
Buying Guide
You want a smooth tow. You want a steady ride. You want parts you can trust.
You feel the trailer stay firm. You see each arm work clean. You enjoy the calm pull on the road.
Factors to Consider
-
Load Rating: Pick an arm that matches your trailer’s weight. Check the 3.7K or 5.2K rating. Make sure it can hold your full load with ease.
-
Fit and Size: Look at the bolt pattern and spindle type. Make sure the arm fits your axle. A good fit gives you a smooth ride.
-
Brake Type: Choose disc brakes or no brakes based on your trailer. Disc brakes give strong, clean stops. Idler arms work well when you do not need brakes.
-
Build Quality: Look for steel and zinc parts. Strong metal lasts long. Good coating helps stop rust fast.
-
Ease of Install: Pick parts with ready hardware. A simple setup saves time. Clear fit points help you get back on the road fast.
-
Ride Feel: A good torsion arm cuts shake and shift. It keeps your trailer steady. You get a calm, safe tow.
-
Maintenance Needs: Some arms use Vault hubs. They need no care at all. This keeps your trailer ready for long trips.
-
Trailer Type: Match the arm to your boat, RV, or utility trailer. Right parts give better balance. Your trailer stays safe on every trip.
-
Left or Right Side: Check if you need left-hand or right-hand arms. The right side keeps your axle aligned. This helps your trailer track straight.
-
Price and Value: Look for strong parts at a fair cost. Good arms last long. You save money over time.