Two speeds, and why you use both
A landing gear set has a low gear and a high gear, and the handle position picks between them. Low gear is the torque gear. It lifts a loaded trailer off the fifth wheel a fraction of an inch per turn, and it is the only gear you should be in under load. High gear is free travel: no weight on the legs, spinning the feet down to the ground or back up for the road. Cranking a loaded trailer in high gear is how gearboxes strip, and a stripped gearbox usually takes the crossshaft with it.
If your handle spins with no lift, or the legs move at different rates, the problem is normally inside the gearbox or at the crossshaft connection rather than in the legs themselves. Both legs have to rise together. A trailer that tips as you crank is telling you one side is not driving.
Matching a set: height, stroke and mount
Landing gear is specified by mounting height, which is the distance from the frame rail to the mounting face, plus total travel and mounting style, either bolt-on flange or weld-on. Get the height wrong and your feet either will not reach the ground or will not retract far enough to clear a dock approach. Measure the existing set before you order, and measure both the retracted and the extended positions rather than guessing from the trailer's model year, because the same trailer model is often built with more than one gear height across production runs.
Numbers do most of the work here. The set we stock carries LG4001-700000078 and crosses to SAF-Holland LG4001-710000000, and the same legs also show up under HLDLG4001700000078, LG2T8Z-7259F3000 and LGD700-21 depending on who catalogued them. If any of those five numbers is on your old casting or on your parts list, you are looking at the same set. It ships as a matched pair, right hand and left hand together, at roughly 205 lb in a 50 x 24 x 18 in carton, which tells you to have a jack and a second person before the truck arrives.
Feet are the other choice. Flat feet are the default for paved yards and docks, and that is what the LG4001 set uses. Sand shoes spread the load and are what you want if your trailer spends time on gravel, dirt or soft ground, because a flat foot sinks and a sinking leg is how landing gear gets bent.
When to replace instead of repair
Bent legs, a gearbox that jumps under load, a crossshaft that twists, or a foot that has torn loose are all replacement territory, and landing gear is normally replaced as a pair for that reason. A single new leg beside a worn one loads unevenly, and the mismatch shows up as the trailer leaning on the legs. Handles and some gearboxes are serviceable separately when the legs themselves are straight.
The cheap failure to catch early is corrosion at the mounting flange. Once the flange is compromised the leg can hold weight standing still and still fold when the trailer is nudged, which is exactly the failure that happens with a driver underneath. If your flange is soft, take it out of service. Our sets carry a 6+ month warranty, but no warranty helps a leg that was mounted to rotten steel.
Landing Gears we stock right now
Live prices and stock from our Tacoma, WA warehouse — every part a Premium Quality aftermarket Direct Replacement with a 6+ month warranty and published cross-reference numbers.
See all Landing GearsFrequently asked questions
Do I have to replace both landing gear legs at once?
Normally yes, and the LG4001 set ships that way, right hand and left hand as one matched pair. The legs share a crossshaft and lift together, so a new leg paired with a worn one loads unevenly and puts the whole set out of sync. Gearboxes and handles can often be replaced on their own if the legs are straight.
What is the difference between sand shoes and flat feet?
Surface area. Flat feet suit paved yards and docks, and that is the configuration on our LG4001 set. Sand shoes are wider and spread the load for gravel, dirt and soft ground, where a flat foot sinks and the leg can bend.
How do I measure for a replacement set?
Measure the mounting height from the frame rail to the mounting face, then the retracted and extended leg positions. The same trailer model is often built with more than one gear height, so measure rather than order by model year.
What does LG4001-700000078 cross to?
It is the same set as SAF-Holland LG4001-710000000, and it is also catalogued as HLDLG4001700000078, LG2T8Z-7259F3000 and LGD700-21. Any of those numbers on your old part or parts list points at this pair.
How much does a landing gear set weigh?
About 205 lb for the complete pair, shipped in a carton around 50 x 24 x 18 in. Plan on a jack and a second set of hands for the swap rather than muscling a leg into place.
Can I crank a loaded trailer in high gear?
No. High gear is for free travel with no weight on the legs. Lifting under load belongs in low gear, and high gear under load is the usual way gearboxes strip and take the crossshaft with them.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships.
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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.