How do I Check GMC Jimmy Transmission Fluid?

Star the engine of the GMC Jimmy and allow it to warm up for 10 minutes. Transmission fluid should always be checked at operating temperature to ensure an accurate measurement.

Keep the engine running. Place your foot on the brake pedal. Move the shift lever through the different gears, pausing for three seconds with each gear before continuing to the next gear. Finish with the shift lever in Park (P). Allow the engine to idle for three minutes.

Open the hood of your Jimmy. Locate the transmission dipstick, which is under the TRANS/LOCK handle near the center of the engine compartment. Flip the handle up and pull the dipstick out. Wipe the tip off with a clean rag.

Replace the dipstick and push it all the way back into the reservoir. Wait three seconds and remove the dipstick. Read the measurement of fluid in the HOT area on the dipstick. If the fluid is in the acceptable range, replace the dipstick and flip the handle back down to lock the dipstick in place. If the fluid is below the lowest HOT marking, fluid needs to be added to the system.

Place a funnel in the reservoir neck and slowly add automatic transmission fluid. You should need less than a pint to bring the fluid level within the HOT range. Recheck the fluid on the dipstick. Once the fluid registers at an acceptable level, flip the handle down and close the hood of the Jimmy.

Park the GMC Jimmy on a level surface and apply the emergency brake. Allow the vehicle to cool off long enough so that you can rest your fingers on the transmission case. If the vehicle has recently been driven a long distance, wait a half hour.

Open the hood of the GMC. Remove the small rubber filler plug from the transmission case.

Check the transmission fluid level. If the level is adequate,the fluid should reach the bottom of the filler plug hole. If you find that the level is adequate, replace the filler plug by pushing it into place. If the level is low, add fluid to the system.

Place a funnel in the plug hole. Pour a small amount of synchromesh transmission fluid into the funnel. Be sure to add only a small amount at a time. Continue adding fluid until the level reaches the bottom of the filler plug hole. Replace the filler plug and push it into place to ensure that it's securely in place. Close the hood of the Jimmy.