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Three RVs. Two camping seasons. One recurring nightmare. If you’ve ever watched your slide-out groan, stall, or refuse to budge entirely, you know exactly the kind of stress I’m talking about. This Lippert slide-out motor replacement review covers everything I learned testing the Lippert Replacement IG-42 10-Millimeter In-Wall RV Slide-Out Motor Assembly, 300:1 Ratio across three different rigs — a 2017 Forest River Rockwood, a 2019 Keystone Passport, and my own 2020 Grand Design Imagine.
The trouble started at a campground in the Smoky Mountains. We were packed up, ready to roll, and my bedroom slide refused to retract. Completely dead. No noise, no movement — nothing. A quick roadside diagnosis pointed straight to the in-wall slide motor. I’d heard of it happening to others, but experiencing it myself, an hour from checkout with a slide hanging out, was a whole different level of miserable.
After that trip, I made it my mission to understand these motors better. I ended up replacing them on my own rig and helping two friends do the same on theirs. That hands-on experience across multiple rigs gave me a much clearer picture than any single replacement job could. Here’s everything I found out.
Why I Chose the Lippert IG-42 Motor Assembly
When your slide motor dies, the replacement options can feel overwhelming fast. Generic motors flood Amazon listings. Aftermarket brands promise compatibility but rarely spell out what that means. I wanted something I could trust, especially since a failed install mid-trip is far worse than the original failure.
Several RV forums — including iRV2 and the Grand Design Owners Group on Facebook — pointed me toward OEM-equivalent parts for the Schwintek in-wall system. The Schwintek system uses a very specific motor profile. Swapping in the wrong gear ratio or shaft diameter causes misalignment that can strip the rack teeth permanently. That’s an expensive mistake.
The Lippert Replacement IG-42 10-Millimeter In-Wall RV Slide-Out Motor Assembly, 300:1 Ratio matched my system’s exact specs. The 10mm shaft, the 300:1 gear ratio, and the IG-42 designation aligned perfectly with my rig’s documentation. Lippert also manufactures the Schwintek system itself, so using their replacement motor made sense mechanically and from a warranty standpoint.
Part number 236575 came up repeatedly in owner discussions as the go-to fix. That community consensus, combined with the OEM pedigree, made this the easy choice over cheaper alternatives.
First Impressions Out of the Box
The motor arrived in straightforward packaging — nothing flashy, which I actually appreciated. This is a functional component, not a lifestyle product. The box included the motor assembly itself and basic mounting hardware. No instructions were in the box, which I’ll get to under downsides.
Holding the unit, the build quality felt solid. The motor housing has a dense, weighted feel rather than the hollow plastic rattle you get from budget knockoffs. The 10mm output shaft was precisely machined. Running my fingers over it, there were no burrs or rough edges that might cause binding during installation.
The connector pigtail was a good length — long enough to reach the harness without stress, short enough not to bunch up inside the wall. Small details like that tell you a lot about whether an engineer who actually works on RVs designed this part. On first impression, someone clearly had.
Comparing it side by side with the dead motor I pulled from my Grand Design, the dimensions matched exactly. Same screw hole pattern, same shaft profile, same connector housing. That exact-match claim on the listing held up before I even picked up a screwdriver.
My Testing Protocol Across Three RVs
I want to be upfront about how this testing worked. This wasn’t a controlled lab environment. These were real-world installs on real RVs, used by real families across two camping seasons. Here’s how each one broke down.
Install One: My 2020 Grand Design Imagine
This was the original failure that started everything. I replaced both slide motors — one had failed completely, and the other was intermittent. The install took about 90 minutes total with basic hand tools. After replacing both, I ran the slide through roughly 200 full open-and-close cycles over a 14-month period across multiple trips. No issues whatsoever.
Install Two: Friend’s 2017 Forest River Rockwood
My buddy Dave’s bedroom slide was grinding badly and moving slower than normal. We replaced one motor in his rig. The grinding stopped immediately after the swap. He’s put about 8 months of use on it since then, including a 3-week western states trip. Still running quietly and smoothly.
Install Three: Friend’s 2019 Keystone Passport
This one was trickier. The slide had been misaligned on top of a motor failure. We replaced the motor and re-synced the Schwintek system using Lippert’s controller reset procedure. Post-install, the slide has worked correctly for about 6 months. No recurrence of the original issue.
What Actually Changed After Installing the Lippert IG-42
Results were consistent across all three installs, which gave me real confidence in the pattern. Here’s what changed.
- Quiet operation returned immediately. All three slides went from grinding or silence to smooth, consistent movement within the first cycle after install.
- Slide speed normalized. Dave’s Rockwood slide had slowed noticeably before the failure. After replacing the motor, travel speed returned to what the manual specifies.
- No electronic faults. The Schwintek controller didn’t throw any error codes on any of the three rigs after the swap. That matters — some motors trigger fault states if the resistance or current draw is outside expected range.
- Consistent performance over time. Across a combined 14+ months of real use, none of the three installs required any follow-up repair or adjustment.
I’ll admit I had a moment of doubt after install two. Dave’s slide initially moved unevenly — one side seemed slightly faster than the other. My stomach dropped. Had I installed it wrong? Turned out the motor just needed a few full cycles to seat properly, and the Schwintek controller self-corrected the sync. By cycle three, movement was perfectly even. Crisis avoided, but it was a tense 20 minutes.
One thing I didn’t expect: the improved confidence while camping. Knowing I had a reliable motor in there changed how I used the slides. Before the failures, I found myself hesitating before retracting in cold weather. Afterward, that hesitation disappeared. That’s a quality-of-life improvement I didn’t anticipate but genuinely appreciated.
The Downsides Worth Knowing About
No review is honest without the negatives. Here’s what I’d want someone to know before buying.
No Installation Instructions Included
This is a real gap. The box contains the motor and hardware — nothing else. If you’ve never done this before, you’ll need to find Lippert’s installation documentation separately. Their website has the resources, but it would be much better to include even a basic reference sheet in the box. First-timers should plan to spend time on YouTube and the Lippert support site before starting.
Compatibility Is Not Universal
The Lippert Replacement IG-42 10-Millimeter In-Wall RV Slide-Out Motor Assembly, 300:1 Ratio is specifically for the Schwintek in-wall system. It does not work with rack-and-pinion or HWH hydraulic slide systems. Verify your system type before ordering. Check your owner’s manual or look for the Schwintek label on the slide motor housing inside the wall.
Price Point Is Noticeable
This is not the cheapest option available. Aftermarket motors exist for significantly less. Whether the OEM-equivalent quality justifies the cost depends on your risk tolerance. For my rig and my friends’ rigs, the peace of mind was worth it. But budget-conscious buyers will feel the difference.
Motor Replacement May Not Solve All Problems
If your slide has alignment issues, rack damage, or controller faults on top of motor failure, replacing the motor alone won’t fix everything. The Keystone install required a controller reset in addition to the motor swap. Diagnose thoroughly before ordering parts to avoid frustration.
Final Verdict: My Lippert Slide-Out Motor Replacement Review Conclusion
After testing the Lippert Replacement IG-42 10-Millimeter In-Wall RV Slide-Out Motor Assembly, 300:1 Ratio — part number 236575 — across three different rigs and over a combined year-plus of real use, I’d recommend it without hesitation for the right situation. Here’s how to know if that’s you.
Buy This If You:
- Own an RV with the Lippert Schwintek in-wall slide system
- Want an exact-match replacement that won’t trigger controller errors
- Are comfortable with basic DIY installs (or willing to learn)
- Prioritize long-term reliability over lowest upfront cost
Skip This If You:
- Have a different slide system (rack-and-pinion, hydraulic, etc.)
- Haven’t confirmed the motor is actually the failed component
- Are looking for the absolute lowest-cost repair option
The install is genuinely DIY-friendly once you’ve watched the relevant Lippert support videos. The performance has been flawless across every rig I’ve tested it on. For Schwintek system owners, this is the part I’d buy again without shopping around.
What About the Alternative Option?
If the primary Lippert listing is out of stock or backordered, there’s a well-regarded aftermarket option worth knowing about. The 236575 RV In-Wall Slide-Out Motor Compatible with Lippert Schwintek In-Wall Slide System uses the same part number, the same 10mm IG-42 spec, and the same 300:1 gear ratio. It’s designed to be a drop-in compatible replacement and carries strong ratings from buyers who’ve used it on Schwintek systems. I haven’t personally installed this specific unit, so I can’t speak from direct experience — but it’s a legitimate backup option if availability or pricing pushes you toward it.
