A service manager at an Ames-area dealership called us last spring with a problem that had nothing to do with a broken machine: he was adding two suspension bays to an existing shop and wanted a 2 post car lift dropped into each one without tearing up the floor twice. He had a footprint sketched on graph paper, a ceiling height he wasn’t sure about, and a concrete pour scheduled for a Tuesday. That’s the phone call we like, because sequencing a build-out correctly is the difference between a clean install and a very expensive redo. We’re based in Ames, we install across Iowa and the surrounding states, and we’ve measured enough bays to tell you exactly what matters and in what order.
Rotary, Challenger, BendPak and Atlas two-post models in stock, from 9,000 lb symmetric up through 15,000 lb heavy-duty. Tell us your ceiling height and slab thickness and we’ll match a model to the bay before you buy.
Start With Ceiling Height, Not Capacity
Almost everyone starts the conversation with capacity, and almost everyone should start with ceiling height. Capacity is easy to solve — if your heaviest vehicle is 6,000 lb, a 10,000 lb column set has enormous margin. Ceiling is the constraint you cannot buy your way out of after the fact. A clearfloor overhead two-post typically wants somewhere between 12 and 14 feet of clear height under the lowest obstruction, and “lowest obstruction” means the bottom of a truss, a light fixture, a conduit run, or a garage door track in the open position — not the peak of the roof.
We had a customer in North Dakota tell us his maximum height was 139 inches. That’s 11 feet 7 inches, and it immediately ruled out every overhead-beam model in the catalog. His only real path was a baseplate design, where the equalization cables and hoses run through a floor plate between the columns instead of across an overhead beam. Baseplate lifts trade a small tripping ledge for unlimited vertical clearance, and in a low shop they’re the correct answer, not a compromise. Measure to the bottom of the obstruction, write the number down in inches, and let that number pick the family of lift before you pick the capacity. Every other dimension flows from that one.
The Bay Footprint Numbers That Actually Matter
A standard 10,000 lb two-post occupies less floor than people expect and more air than they plan for. Column-to-column inside spacing on most symmetric models runs about 110 to 116 inches; asymmetric models are usually a bit narrower. Add roughly 30 inches on each side for a technician to walk, swing a door, and run an air hose, and you want a bay in the 22- to 24-foot-wide range if you’re doing suspension work with a parts cart alongside. Depth is more forgiving: 24 feet gets you a full-size pickup plus room to stand at the tailgate.
Where dealerships get burned is the adjacent obstruction. One of our Missouri installs had a loft on the left side and a solid wall on the right, which meant the columns had to shift several feet off-center just to let the arms swing. Another shop had a 16-foot overhead door directly in line with the driver-side column — fine at rest, a problem when the door was up. Before you commit, tape the column footprints on the floor, park your heaviest and longest vehicle between them, and open both doors. Do it with the vehicle you actually service most, not the smallest one. Ten minutes with painter’s tape has saved more installs than any spec sheet ever has.
Concrete: Thickness, Cure, and Why 4 Inches Scares Us
Concrete is the single most common reason we tell someone to slow down. Most manufacturers specify a minimum of 4 to 4.25 inches of 3,000 PSI concrete for a 10,000 lb two-post, and many spec 6 inches for anything heavier. Those are minimums, not targets. A four-inch slab poured over poorly compacted fill in 1978 is not the same material as a four-inch slab poured last year over engineered base. We ask three questions: how thick, how old, and what’s under it. If any answer is a shrug, we recommend coring.
A homeowner in Missouri told us his slab was “about 5 inches, but maybe less.” That “maybe” is what a 3/4-inch anchor lives in. Our fix in cases like that is a footing pad — cut out a section under each column, dig down, and pour a dedicated 12- to 18-inch thick pad tied into the surrounding slab. It costs a fraction of what a dropped vehicle costs, and it turns a marginal floor into one nobody has to think about again. If you’re building new, this is the easy version: tell your concrete contractor the column locations before the pour and let him thicken those two areas. Also respect cure time — 28 days before you torque anchors into fresh concrete, no exceptions, no matter how hard the slab feels on day ten.
Sequencing the Build-Out So You Only Pour Once
The order of operations for a shop expansion should be: measure and set the lift model, mark column locations, route electrical and air, pour or reinforce concrete, cure, then install. What actually happens on most jobs is that someone pours the floor, frames the walls, hangs the lights, and then calls us. At that point the light fixtures are exactly where the carriages want to travel and the 220V drop is on the wrong column.
Get the power right early. Most 10,000 lb units run a 220V single-phase motor and want a dedicated 30-amp circuit; larger commercial units may be three-phase. The power unit almost always mounts on the driver-side column, so run the drop there and leave enough slack that an electrician isn’t cursing you. Same with air — a two-post with air-actuated lock releases needs a line to the columns, and a quarter-inch line tucked into a wall is far tidier than one coiled across the floor. If you’re doing a suspension bay, plan the parts cart and spring compressor location now, and think about lighting from underneath the vehicle rather than above it. LED strips on the column faces beat a single high bay every time when a tech is on his back pulling a strut. Sequenced this way, the install crew shows up, anchors, plumbs, torques, and leaves in a day.
Choosing a 2 Post Car Lift for Suspension and Shock Work
Suspension work has a specific demand profile, and it changes which model we recommend. Struts and shocks mean the tech is under the vehicle for extended periods with the wheels hanging free, torquing fasteners at awkward angles and occasionally leaning on things. You want a lift that comes up high enough to stand fully upright — meaning a rise near 72 to 78 inches at the pads — and arms that put the pads on the pinch welds without fighting rocker panel cladding.
For that work we lean toward asymmetric or versymmetric column geometry with three-stage front arms and drop-end capability. The drop-end arms matter more than people realize: on lowered cars and on modern crossovers with low rocker trim, a standard arm pad won’t get under the lift point without wood blocks, and wood blocks are how vehicles get dropped. Rotary’s SPOA10 family and Challenger’s CL10 series both handle a mixed dealership fleet well, and the BendPak XPR-10S is a solid clearfloor option with an expandable top beam and telescoping screw pads that give you real flexibility on drive-thru width. If your shop sees heavier trucks — three-quarter-ton and up with plow packages — step to a 12,000 or 15,000 lb model rather than running a 10,000 lb unit near its ceiling. Capacity headroom on a 2 post car lift is cheap insurance and it shows up in cable and cylinder life a decade later.
Symmetric, Asymmetric, and Which One Fits Your Mix
Symmetric two-post lifts place the columns directly across from each other with arms of equal length, centering the vehicle’s weight between them. That geometry is ideal for trucks, vans, and anything long and heavy, and it’s why fleet shops still buy symmetric. The downside is door clearance — the vehicle sits centered, so front doors open into the columns, and on a sedan that’s genuinely annoying all day long.
Asymmetric lifts rotate the columns roughly 30 degrees and pair short front arms with long rear arms, sliding the vehicle back so the doors clear the columns. For a dealership doing passenger cars and crossovers, asymmetric is usually the right call. The versymmetric designs split the difference with arms that can be configured either way, which is what we recommend when a shop genuinely doesn’t know what will roll in. One caution: an asymmetric setup only works if the technician actually loads the vehicle correctly. We’ve seen shops buy asymmetric and then park everything as if it were symmetric, which puts too much weight forward and makes the lift feel unstable. That’s a five-minute training conversation, and we cover it during handover on every install. Whatever you choose, pick based on your real vehicle mix over the last year, not on the one exotic project car you might work on someday.
What Our Ames Install Day Actually Looks Like
When we install, we bring the anchors, the torque wrench, the hammer drill, and the shims. The columns get set to the manufacturer’s spacing, plumbed with a level in both planes, and shimmed if the floor slopes — and almost every floor slopes, because shops are built with drains. Anchors get drilled to depth, blown clean, driven, and torqued to spec, and we re-torque after the first cycle. Cables get tensioned so both carriages arrive at the top together, and the safety locks get checked at every position, not just the top.
Then we test with weight. Not an empty run — an actual vehicle, raised, locked, bounced, and lowered. We walk the customer through the lock release, the arm restraints, the pad configurations for their common vehicles, and the daily and monthly inspection points. That last part is where most shops save themselves a service call. Checking cable tension quarterly and greasing the carriage slides takes ten minutes and roughly doubles the useful life of the equipment. If you’d rather not handle install yourself, we cover Iowa and the surrounding region with our own crews, and if you’re a capable shop that wants to bolt it down yourself, we’ll ship it and stay on the phone with you. Either way, call 800-674-9302 before you pour concrete, not after — and if you’re comparing models, our guides on two-post installation requirements and concrete requirements for car lifts cover the details in depth.
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