Keep your slide-out operating smoothly with this genuine Lippert replacement outboard outer assembly designed specifically for the idler side of rack-and-pinion slide-out systems. Built for 2.5 x 2.5 inch tubing configurations, this is a direct-fit structural component used when rebuilding or repairing a Lippert slide-out mechanism.
Lippert Components is one of the most widely used slide-out system manufacturers in the RV industry. When a slide-out outboard assembly wears, bends, or fails, replacing it with the correct OEM part matters -- aftermarket substitutes often require modification or create alignment issues that lead to bigger problems down the road.
Part 143674 is the outboard outer assembly for the idler side of the slide-out room. On a rack-and-pinion slide-out, the idler side is the non-motor side. The outboard outer assembly is the outermost structural tube and bracket component that rides along the slide-out travel path, supporting the room and keeping it properly aligned during extension and retraction.
This component is specifically sized for systems using 2.5 x 2.5 inch square tubing, which is common across a wide range of mid-size and full-size RV slide-out rooms built by Lippert.
Genuine Lippert part number 143674 -- ensures proper fit and alignment without modification.
Designed for the non-motor (idler) side outboard position. Not interchangeable with motor-side or inboard assemblies.
Fits slide-out systems using 2.5 x 2.5 inch square tube configurations, common in Lippert rack-and-pinion setups.
Restores correct support and travel alignment to the slide-out room after damage, wear, or corrosion.
In a Lippert rack-and-pinion slide-out system, the slide room is supported and guided by a set of nested tube assemblies -- inner and outer, on both the inboard and outboard ends, and on both the motor side and the idler side. The outboard outer assembly is the exterior-facing structural tube that forms the outermost layer of the slide mechanism on that side of the room.
Over time, these assemblies can suffer from corrosion, impact damage from road debris, binding due to misalignment, or wear on the contact surfaces. When that happens on the idler side outboard position, this replacement assembly restores the original geometry and smooth operation of the slide-out system.
This assembly is compatible with Lippert rack-and-pinion slide-out systems that use 2.5 x 2.5 inch square tubing. This tubing size is found across a broad range of RVs including fifth wheels, travel trailers, and Class A motorhomes manufactured from the early 2000s through recent model years.
To confirm fitment before ordering, identify:
Replacing an outboard outer assembly is a structural repair that typically requires removing the slide-out room or at minimum retracting it fully and disassembling the slide mechanism. This job is best suited for experienced RV technicians or mechanically confident DIYers familiar with Lippert slide-out systems.