First: does your transmission have a dipstick?

Not every automatic transmission can be checked at home. The 2026 Ram 1500 Owner's Manual says the fluid level of its transmission is preset at the factory and does not require adjustment under normal operating conditions; routine fluid level checks are not required, so the transmission has no dipstick. The 2022 Ram 2500/3500 Owner's Manual says the same about its 8-speed automatic.

The same 2022 Ram 2500/3500 manual gives a dipstick procedure for its 6-speed automatic. The engine oil dipstick is a different part, so check your owner's manual to see which kind of transmission you have before you start.

From the 2026 Ram 1500 Owner's Manual (Automatic Transmission: Fluid Level Check, page 326) and the 2022 Ram 2500/3500 Owner's Manual (Fluid Level Check — 8-Speed Transmission; Fluid Level Check — 6-Speed Transmission), read October 29, 2026.

How to check transmission fluid with a dipstick, step by step

These are the steps the 2022 Ram 2500/3500 Owner's Manual gives for its 6-speed automatic. It says the level is best checked at normal operating temperature, 158-176°F (70-80°C), which normally takes at least 15 miles (25 km) of driving; that truck shows the transmission temperature on the instrument cluster display.

• Drive as needed to bring the transmission to normal operating temperature.
• Park the vehicle on level ground.
• Run the engine at normal idle speed for at least 60 seconds, and leave it running for the rest of the check.
• Fully apply the parking brake and press the brake pedal.
• Move the gear selector momentarily into each gear position, allowing time for the transmission to fully engage in each, ending in PARK.
• Unlock the dipstick cap and remove the dipstick, wipe it clean and reinsert it until it is seated.
• Remove it again and note the fluid level on both sides.
• Reinsert the dipstick until it is fully seated and lock it down, then check for leaks and release the parking brake.

From the 2022 Ram 2500/3500 Owner's Manual (Fluid Level Check — 6-Speed Transmission), read October 29, 2026. Other transmissions use different steps and temperatures; follow your own manual.

Reading the dipstick and adding fluid

For that 6-speed, the manual explains how to read the dipstick and what to do if the level is low:

From the 2022 Ram 2500/3500 Owner's Manual (Fluid Level Check — 6-Speed Transmission), read October 29, 2026.

If your transmission has no dipstick

For a sealed transmission, the 2026 Ram 1500 Owner's Manual says an authorized dealer can check the fluid level using special service tools. If you notice fluid leakage or transmission malfunction, it says to have the transmission fluid level checked immediately, because operating the vehicle with an improper fluid level can cause severe transmission damage.

It also says that under normal operating conditions the factory-fill fluid provides satisfactory lubrication for the life of the vehicle and routine fluid and filter changes are not required; the fluid and filter should be changed if the fluid becomes contaminated (with water, for example) or the transmission is disassembled. Other makes and models set their own intervals, so check your maintenance schedule.

From the 2026 Ram 1500 Owner's Manual (Automatic Transmission: Fluid Level Check; Fluid And Filter Changes, page 326), read October 29, 2026.

Use the right fluid, and skip the additives

Both manuals say to use only the manufacturer's specified transmission fluid and to keep it at the correct level. They warn that a fluid other than the recommended one may cause deterioration in shift quality and/or torque converter shudder.

The 2022 Ram 2500/3500 Owner's Manual strongly recommends against special additives: automatic transmission fluid is an engineered product, and supplemental additives may impair its performance. The only exception it names is special dyes for diagnosing leaks. It also says to avoid transmission sealers and not to use chemical flushes, which can damage transmission components.

From the 2022 Ram 2500/3500 Owner's Manual (Selection Of Lubricant; Special Additives) and the 2026 Ram 1500 Owner's Manual (Selection Of Lubricant, page 326), read October 29, 2026.

If a transmission temperature warning light comes on

In the 2026 Ram 1500 Owner's Manual, the Transmission Temperature Warning Light warns of a high transmission fluid temperature, which may happen with strenuous use such as trailer towing. If it comes on, the manual says to stop the vehicle and run the engine at idle or slightly faster, with the transmission in PARK or NEUTRAL, until the light turns off; then you may continue normally.

It warns that driving on with the light on could make the fluid boil over and contact hot engine or exhaust parts and cause a fire, and that continuous driving with the light on will eventually cause severe transmission damage or failure.

From the 2026 Ram 1500 Owner's Manual (Transmission Temperature Warning Light, pages 142 and 143), read October 29, 2026.

Transmission service at Elgin Auto Sales

Our service department handles everything from routine oil changes to complex transmission replacements, for vehicles including Toyota, GMC, Buick, Honda, Kia and Hyundai models, and for pre-owned car buyers. If your transmission has no dipstick, you see a fluid leak, or shifting does not feel right, schedule a visit and tell us what you are noticing.

Elgin Auto Sales & Service Center is at 1200 E. Chicago St. in Elgin. Our service department is open Monday to Friday 8 a.m. to 5 p.m. and Saturday 8 a.m. to 4 p.m., and is closed Sunday. Get directions.

Schedule service online or see our service specials.