FLUID LEVEL CHECK
See Figures 1 and 2
The oil in the manual transmission should be checked at least every 7500 miles (12,000 km) for 1970-78 vehicles, or 15,000 miles (24,000 km) for 1979-88 vehicles and replaced every 25,000-30,000 miles (40,000-48,000 km), even more frequently if driven through deep water.
- With the truck parked on a level surface, remove the filler plug (square head on some models, Allen head on others) from the left side of the transmission housing.
- If the lubricant begins to trickle out of the hole, there is enough. Otherwise, carefully insert your finger (watch out for sharp threads!) and check to see if the oil is up to the edge of the hole.
- If not, add oil through the hole until the level is at the edge of the hole. Most gear lubricants come in a plastic squeeze bottle with a nozzle; making additions simple. You can also use a common everyday kitchen baster.
- Replace the filler plug, run the engine and check for leaks.