How Much Does an Automatic Transmission Weigh?

Whether you’re planning to pull a transmission for a rebuild, ship one across the country, or just curious what’s hanging beneath your car, the number matters more than you’d think. So how much does an automatic transmission weigh? On average, most passenger car automatic transmissions weigh between 100 and 400 pounds, with the typical sedan or crossover landing somewhere in the 150 to 250 pound range.

How Much Does an Automatic Transmission Weigh by Vehicle Type

Transmission weight scales with the vehicle it’s built for and how much torque it needs to handle. Here’s a general breakdown:

• Compact and midsize cars (4 to 6-speed automatic): roughly 120 to 180 pounds
• Larger sedans and crossovers (6 to 8-speed automatic): roughly 150 to 220 pounds
• Half-ton trucks and full-size SUVs: roughly 190 to 250 pounds
• Heavy-duty trucks: 250 pounds and up, sometimes exceeding 300 pounds

These figures are for the transmission alone, without fluid. A full automatic transmission typically holds 8 to 12 quarts of transmission fluid, which adds another 15 to 25 pounds once filled, so don’t forget to account for that if you’re calculating total weight for shipping or lifting purposes.

Why Automatic Transmissions Weigh More Than Manuals

An automatic transmission is a considerably more complex piece of hardware than a manual gearbox. It houses a torque converter, multiple clutch packs, a valve body, and a planetary gear set, all of which add mass compared to a manual’s simpler synchronizer-and-gear setup. On average, an automatic transmission weighs 50 to 75 pounds more than the manual transmission offered in the same vehicle, with the exact gap depending on the number of gears and the transmission’s overall design.

Why This Number Matters

Knowing your transmission’s approximate weight matters for a few practical reasons. If you’re pulling one for a rebuild or replacement, it tells you what kind of jack, engine hoist, or transmission jack you’ll need, since these aren’t safe to lift by hand, the same caution worth taking with wheel work like knowing the correct lug nut torque spec before reinstalling a wheel. If you’re shipping a used transmission, the weight directly affects freight cost. And if you’re doing a swap into a different chassis, matching or accounting for the weight difference can affect your car’s front-to-rear weight balance, particularly relevant if you’re also weighing something like a 5.7 Hemi engine’s weight for the same build.

Handling a Transmission Safely

Given that even a standard passenger car automatic transmission can exceed 150 pounds, this isn’t something to lift manually. A hydraulic transmission jack, ideally one with a tilting or leveling head, is the standard tool for the job, letting you carefully align the transmission with the engine or bellhousing while supporting its full weight. Attempting to muscle a transmission into place by hand risks both injury and damage to the transmission’s delicate mating surfaces. It’s also a good moment to double-check other under-car fluids while everything’s apart, the same logic behind knowing your coolant capacity before a flush rather than guessing.

Conclusion

So, how much does an automatic transmission weigh? Most passenger car automatics fall between 150 and 250 pounds dry, with trucks and heavy-duty applications running higher, sometimes past 300 pounds. Add another 15 to 25 pounds once it’s filled with fluid, and always use a proper transmission jack rather than attempting to lift or support one by hand. Keeping track of details like this is exactly what our car maintenance checklist is meant to help with.

Frequently Asked Questions