Transmission Jack Height and Capacity Planner

A transmission jack for lift work must do two things: reach the transmission mounting point high above the floor, and carry the transmission’s weight with the margin you require. This planner checks both against eight listed transmission jacks with published specs. For floor jobs, it also checks whether the jack fits under the vehicle.

1. Enter the transmission weight plus the weight of any adapter or plate, and pick lb or kg.
2. Type the margin multiplier your shop policy or the jack maker’s manual requires. No value is pre-filled, and anything below 1.00 is rejected with a message in the results box.
3. Measure the height of the transmission mounting point above the floor, with the vehicle at its working height, and pick in or cm.
4. Add the height of any adapter or plate stack that sits on the saddle (0 if none).
5. Choose Car lift or Floor. For floor jobs, enter the clearance at the point where the jack rolls under the vehicle. On a lift, that field is optional.
6. Press Check jacks. Each listed jack shows either “Fits” or the check it failed and by how much, along with the listing its specs came from. The page address updates, so you can share the link and others will see the same answer.

The planner applies three checks. A jack qualifies only when every check that applies to your job passes.

• Capacity: required rating R = W × M. It passes if the jack’s rated capacity is at least R.
• Reach: it passes if minimum saddle height + S ≤ H ≤ maximum saddle height + S.
• Clearance (required on the floor, optional on a lift): it passes if minimum saddle height + S ≤ C.

Metric inputs are converted with exact definitions: 1 lb = 0.45359237 kg (so 1 kg ≈ 2.20462 lb) and 1 in = 2.54 cm. The margin multiplier is always your own entry, because this tool has no verified basis for choosing one for you. When a jack fails a check, the shortfall is kept unrounded internally, converted to the unit you chose, and only then rounded up to the precision shown (0.01 in, 0.1 cm or 0.1 lb). A real failure therefore never displays as zero, and rounding never works in the jack’s favor.

The table below is a worked example: a 500 lb load with a 1.5 margin (R = 750 lb) and a 60 in mount height on a car lift.

On a lift, the mounting point is usually well above waist height, so the tall jacks in the dataset (maximum height 69–73 in) are the ones that reach. On the floor, the clearance you measure decides: a jack fits only if its minimum height plus your adapter stack is at or below that clearance. In the dataset, the low-lift jacks start at 5.87–7.25 in and the tall jacks at 33–34 in, so enter your own clearance and let the check decide. No single listed jack spans both the low and the tall height ranges.

The planner cannot check:

• the jack’s footprint and base width under the lift arms;
• interference from swing arms or lift columns;
• the saddle’s tilt range;
• load balance;
• how the strap or chain attaches.

Follow the maker’s manual for all of these. The planner also leaves out floor-jack transmission adapters, because their reach depends on the floor jack they sit on.

Our shelf snapshot of marketplace search results is dated September 27, 2026. Filtering it by title gave 14 real transmission jacks. We read each listing’s product page on October 12, 2026, and every capacity and height figure in the planner is tied to that page and date.

• In the planner (n = 8): these listings state a capacity in pounds plus a minimum and maximum height, with no field on the page contradicting another. Two of the eight are the same 34–73 in jack sold under two listings, and the results label both.
• Range not published (6): five listings give no minimum height (Strongway ×2, Sunex 7793B, Sunex 7752C, HW93718), and one states two conflicting heights (AFF B00820LJFU: 32 in vs 34 in). These six are excluded from the calculation.
• No price summary: too few of the 14 jacks showed a price to summarize, so this page shows no prices.

NHTSA/NCSA Research Note (September 1998), based on CPSC NEISS data from November 1994 to October 1995. This is old data:

“Approximately three-fourths (74%) of the persons injured in motor vehicle jack failures were injured as a result of being struck by the vehicle as it fell from the jack.”

NIOSH FACE Report 99CA006 (1999). The incident involved a 37,500 lb transit bus on shop-made jack stands, not a car:

• “A 48-year old male mechanic (decedent) died when he was crushed by a bus that fell off jack stands.”
• Its recommendation: “ensure employees use only tools and equipment that have been tested, certified and rated.”

The sources we used contain no official US fatality count for jacks or jack stands.

Never work under a vehicle supported only by a jack. Follow the maker’s rating and manual and ASME PASE, and see our guides “Is it safe to work under a car on a floor jack?” and “Are jack stands safe?”

• Wikipedia – Inch: 1 in = 25.4 mm exactly.
• Wikipedia – Pound (mass): 1 lb = 0.45359237 kg exactly.
• Marketplace product detail pages, read October 12, 2026 (capacity and height range), for ASINs B01BWZLIQ6, B08HPJPXK5, B08HPYHLYB, B08HJS8R4J, B0DN4R46BH, B007QV6FSC, B0CJM2GBS3 and B000KITUI0. The planner shows the source listing next to each result.
• NHTSA/NCSA – Injuries Associated With Hazards Involving Motor Vehicle “Jack Failures” (1998).
• NIOSH FACE Report 99CA006 (1999).
• ASME PASE – Safety Standard for Portable Automotive Service Equipment. Its scope includes component dollies and jacks.

Last updated: October 2026

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