Using jack stands safely is a foundational skill for anyone lifting a vehicle for maintenance or repair—it’s not optional, it’s non-negotiable. This is an intermediate-level task that takes 15–25 minutes once you’re practiced, but your first time should take 35–45 minutes to ensure every check is thorough. Rushing this process risks crushing injuries or worse.
Overview
| Skill Level | Time Required | Tools Needed | Estimated Cost |
|---|---|---|---|
| Intermediate | 20–45 minutes | Hydraulic floor jack, jack stands, wheel chocks, torque wrench (for reassembly) | $85–$220 (stands: $40–$150; jack: $45–$70) |
Tools & Materials
| Item | Minimum Rating | Notes |
|---|---|---|
| Hydraulic floor jack | 3-ton capacity (for most sedans/SUVs) | Must have saddle height range matching your vehicle’s jacking points (typically 4.5"–18") |
| Jack stands | Rated for ≥1.5× vehicle weight per stand | e.g., For a 3,200-lb car: use 2-ton stands minimum; never mix capacities |
| Wheel chocks | N/A (but must be rubber or composite) | Place on tires opposite the lift side—never wood blocks or bricks |
| Owner’s manual | N/A | Identifies factory-approved jacking points—critical for unibody vehicles |
| Work gloves & safety glasses | N/A | Required: metal shavings, hydraulic fluid, and pinch hazards are real |
Step-by-Step Instructions
1. Park, chock, and prepare the vehicle
Park on level, solid pavement—not gravel, dirt, or asphalt with cracks. Engage parking brake, shift into Park (auto) or first gear (manual), and turn off the engine. Place wheel chocks snugly against the tires diagonally opposite your lift side. Loosen lug nuts ¼ turn *before* lifting—never after.
2. Locate and verify jacking points
Open your owner’s manual and find the exact diagrams for front/rear jacking points. On unibody cars, these are reinforced steel ribs—often marked with notches or dimples. Never lift from control arms, subframes (unless specified), or plastic undertrays. Tap suspected points with a wrench: a dull *thunk* means steel; a hollow *ping* means unsafe plastic or thin sheet metal.
3. Lift and place stands correctly
Raise the vehicle with the floor jack until the tire clears the ground by 1–2 inches. Position the first jack stand directly beneath a designated jacking point—not centered under axle or differential unless confirmed safe. Lower the vehicle *slowly* onto the stand until it bears full weight. Repeat for second stand. Then lower the jack completely—stands must hold 100% of the load. Never leave the jack in contact.
4. Perform the “shake test” and final verification
With hands on the bumper or fender (not the jack stands), push down firmly and rock the vehicle forward/backward and side-to-side. If the vehicle moves more than ¼ inch or makes creaking noises, reposition stands immediately. Crawl underneath only after confirming zero movement and visual alignment: stands must sit flat, upright, and fully seated on solid ground—no wobble, no tilt, no surface debris under feet.
Pro Tips
Professional mechanics treat jack stands as temporary support—not permanent suspension. According to ASE-certified instructor Maria Chen, “I’ve seen three crushed fingers in 12 years—all from skipping the shake test or using mismatched stands. If it wobbles when you tap the frame with a rubber mallet, it’s not safe.”
- Always use two stands per lifted end (e.g., both front wheels up = two front stands), never one
- Never exceed the rated capacity—even if the stand says “6-ton,” your vehicle’s actual weight distribution may overload one leg
- Replace stands showing bent pins, cracked welds, or worn saddle teeth—inspect before every use
A common mistake is placing stands too far inward toward the centerline. This stresses the rocker panel and can buckle unibody seams. Always align stands with the manufacturer’s points—usually within 6–10 inches of the wheel well.
Can I use jack stands on a sloped driveway?
No. Even a 2° incline reduces stand stability by ~37% (SAE International, J2652-2021). Find level concrete or asphalt—or rent a portable leveling pad system. Never use bricks, wood, or stacked metal plates to “level” stands.
Do I need different stands for trucks vs. cars?
Yes. Full-size trucks often require 6-ton stands and taller minimum height (12"+). Compact cars need low-profile stands (as low as 8.5" collapsed) to fit tight clearance. Check your vehicle’s ride height and lowest jacking point before buying.
Is it safe to work under a vehicle supported only by a floor jack?
No—never. Floor jacks are lifting tools, not support devices. Hydraulic seals can fail without warning. The U.S. Bureau of Labor Statistics reports 73% of jack-related injuries occur when people crawl under vehicles held only by jacks.
How often should I replace my jack stands?
Inspect before each use. Replace if older than 10 years, or immediately if you spot pitting, bent adjustment pins, or worn saddle serrations. Aluminum stands fatigue faster than steel—replace aluminum units every 7 years even if unused.
Can I stack jack stands for extra height?
No. Stacking voids all safety ratings and creates lateral instability. Use stands designed for your vehicle’s lift height—or invest in a scissor lift or two-post hoist for frequent work.
What if my vehicle doesn’t have visible jacking points?
Consult the official service manual—not forums or YouTube. Some EVs (e.g., Tesla Model 3) require specific aluminum adapter plates to avoid battery pack damage. Using generic points risks puncturing high-voltage battery enclosures.
Safety isn’t about speed—it’s about certainty. When you hear that solid *clunk* as the vehicle settles fully onto both stands, and feel zero give during the shake test, you’ve earned the right to crawl underneath. For related guidance, see our guide on how to change oil at home and how to replace brake pads safely. And always keep a well-stocked emergency car kit in your garage—it’s the quiet partner to every safe lift you make.