From Driveway to Bay: A Council Bluffs Mobile Mechanic’s Two-Post Install, Start to Finish

A mobile mechanic working out of Council Bluffs called us in February because he was done doing wheel bearings on jack stands in customers’ driveways. He had leased a small two-bay building, had a 30×40 footprint with roughly 12-foot sidewalls, and wanted to know what it would take to get a lift in the ground before spring. That conversation turned into one of the more useful installs we did last year, mostly because he let us do a proper site survey before he bought anything. Automotive two post lifts are not hard to install when the building cooperates, but the building almost never cooperates on the first pass. Here is exactly how that job went, in order, including the parts that cost him money he did not expect.

The site survey: what we measured before quoting

We drove over with a tape, a laser, a rotary hammer, and a core bit. First measurement is always overhead clearance, and not the nominal sidewall number the builder quoted. His sidewalls were 12 feet, but the actual usable clearance under a truss chord at the intended lift location was 11 feet 4 inches, and a run of conduit and a light fixture ate another few inches on one side. That immediately narrowed the field. Second measurement is the door: a 16-foot-wide overhead door with 10 feet of headroom, which sets how tall a vehicle can be to get in at all.

Third is the floor. We cored two spots where the columns would land and pulled plugs at 4.5 and 4.25 inches of decent-looking concrete over compacted base. That is right at spec for most 10,000 lb models, and we told him so honestly — not comfortably above spec, but acceptable. Fourth is drainage slope and floor flatness, because a floor that falls three-quarters of an inch across the column spread means shimming, and shimming beyond the manufacturer’s allowance is a warranty problem. Fifth is power: he had a single 120V circuit in that corner and needed 208-230V single phase for the power unit, which meant an electrician. All five of those numbers change what we recommend, which is why we do not quote automotive two post lifts over the phone from a capacity number alone.

Why he ended up with a baseplate model

With 11 feet 4 inches of real clearance, a clearfloor overhead two-post was off the table. The overhead crossbar and shutoff bar on most 10,000 lb models want 12 feet minimum, and cheating that means either not getting full rise or having the crossbar in the path of a tall van. So we went to a baseplate design, where the equalizer cables and hydraulic line run through a low channel bolted to the floor between the columns instead of across the top.

Baseplate lifts get a bad reputation because of the floor obstruction, and it is a legitimate tradeoff — you are rolling a transmission jack over a two-and-a-half-inch bump. But for a one-man mobile-turned-shop operation doing brakes, bearings, suspension, and general service, that bump matters far less than losing eight inches of rise. He tops out around 68 inches of pad height, which puts a Silverado hub at a comfortable working level for a guy who is six feet tall. The other thing baseplate models buy you is a lower overall column height, in his case about 118 inches, which cleared the conduit run without an electrical relocation. Among automotive two post lifts, baseplate versus clearfloor is the single decision most affected by the building rather than the work, and buildings in this part of Iowa are full of surprises.

Capacity math for a wheel bearing and suspension practice

He asked about 12,000 lb because a friend told him to buy more capacity than he needed. Reasonable instinct, wrong answer here. His actual work is passenger cars, half-ton pickups, minivans, and the occasional three-quarter-ton — call it 7,500 lb worst case at the curb. A 10,000 lb rating on a properly built column gives him margin without pushing him into a heavier unit with taller columns and a bigger power unit, which he did not have the ceiling or the panel for.

Capacity is also not the only rating that matters. Every two-post has a per-arm limit, usually 25 percent of total capacity, and a maximum load distribution spec — often something like 60/40 front-to-rear or 40/60 depending on configuration. Lifting a dually with a loaded bed can violate the distribution spec long before it violates the total capacity. We walked through that with him using real vehicles he had on the books that week. He also asked about low-profile arms, which we specced: pad height around 3.75 inches collapsed, so lowered cars and anything with plastic rocker cladding loads without ramps. That option costs a little and saves aggravation forever. For anyone comparing automotive two post lifts on capacity alone, the arm spec and distribution rating deserve equal weight. Our capacity selection guide goes deeper on the math.

Install day: anchors, plumb, and cable break-in

The install itself took us most of a day with two techs. Columns get set, squared to each other and to the drive-through line, then plumbed with a level on two faces. Plumb is where sloppy installs show up later — a column leaning a quarter inch over 10 feet loads the carriage slide blocks unevenly and you get a lift that binds and squeals in year three. We shimmed one column about three-sixteenths of an inch to account for floor slope, well within the manufacturer’s allowance.

Anchors are ten wedge anchors per column on this model, drilled to depth, blown clean, set with the marked embedment, and torqued to the manual spec. Blowing the dust out of the hole is the step people skip and it directly reduces holding value. Then the hydraulic line, the equalizer cables routed through the baseplate channel, fluid fill, and a bleed cycle. We ran it empty top to bottom half a dozen times, then loaded it with a car and cycled again, then re-adjusted the cables because new cables stretch. That break-in adjustment at the end of install day is the difference between locks that click together for a decade and a lift that runs cockeyed. We came back at 30 days to re-torque anchors and re-check cable tension, which is a real step in the manual for automotive two post lifts and one almost nobody does.

What the electrical and concrete added to the budget

The lift itself was the predictable number. The surprises were around it. A licensed electrician ran a dedicated 230V single-phase circuit to the corner and added a disconnect, which was a mid-hundreds to low-four-figures job depending on panel capacity — his panel had room, which saved him a lot. If it had not, a subpanel would have doubled that line item.

Concrete was the coin flip. His cores came back at 4.25 to 4.5 inches, which cleared spec, so he paid nothing. Had they come back at 3.25 inches, we would have been cutting two roughly five-by-five-foot sections, digging out, tying rebar, and pouring footings — plus a 28-day cure before we could anchor. That is a four-figure adder and a month of delay, and we have had customers walk away from a building over it. This is precisely why we core before anyone buys equipment. A caller in northern Missouri last year described his slab as “about five inches, maybe less,” wanted the lift ASAP, and was frustrated when we insisted on coring first; he ended up glad we did, because it was less. Budgeting for automotive two post lifts means budgeting for the floor and the panel, not just the crate. Our concrete requirements article lays out the coring process.

Six months later: how the bearing work actually changed

We checked in that fall. The measurable change was throughput. Pressed-in wheel bearings on a front-drive car went from a two-hour driveway job with jack stands, a torch, and a bad back to something closer to 75 minutes with the vehicle at chest height and both hands free. Rear hub assemblies on half-tons were the bigger win — being able to spin the rotor, watch the ABS ring, and get a slide hammer swinging without lying on gravel changed the job entirely.

The other thing that changed was what he would accept as work. Suspension jobs he used to turn down — control arms, subframe bushings, exhaust from the cat back — became normal tickets, because the vehicle was up and the underside was accessible. That is the argument for a two-post over ramps or a mid-rise scissor for a general service practice: unobstructed access to the entire underside with the wheels hanging free. He did add a pair of jack stands rated for the load as a backup habit when he is under a vehicle for a long time, which we encourage. He also learned to listen for both locks. Six months in, his cables had stretched the expected amount and we adjusted them on a service visit. That is normal life with automotive two post lifts, and it is cheap when somebody actually checks.

What we would tell the next mobile mechanic going brick-and-mortar

Measure before you shop. The order of operations that saves money is: real overhead clearance under the lowest obstruction, door height, core the slab, check the panel, then pick equipment. Doing it the other way — buying on price and hoping the building fits — is how people end up with a crate in the corner for four months. We have unpacked and re-crated equipment for customers who bought online before anyone looked at their floor.

Second, do not over-buy capacity to feel safe. Buy the right capacity, then spend the difference on the things you touch every day: low-profile arms, closer safety-lock spacing, a better power unit, and an installer who will come back at 30 days. Third, get the manual and read the maintenance section once. Grease the arm pins, watch the cylinder rod for weep, look at the cables, and re-torque the anchors. We sell and install Rotary and Challenger for commercial work and BendPak and Atlas for home and light-duty shops, and we stock cables, cylinders, arm restraints, lock assemblies, and pads for essentially everything in service. If you are in Iowa or western Nebraska and want a site survey before you commit, call 800-674-9302. See also our two-post versus four-post comparison.