There's a plug above and behind (If you're looking in from the drivers side) the CV. It's easiest to get to if you take of the airbox and use a funnel with a long hose.
Gear oil (80W90 or similar) is used in the transfer case and differentials.
half a quart!
It could be the reflection off of metal shavings that have worn off the gears.
To remove helical gears from a shaft, first ensure the assembly is properly supported and secured. If the gear is fixed with a key, remove the key using a suitable tool. Then, use a gear puller to apply even pressure and gently extract the gear from the shaft. If the gear is stubborn, heating the gear or applying penetrating oil may help ease its removal.
UDI
In a 1993 Geo Storm, the gear oil is added to the manual transmission through a fill plug located on the side of the transmission case. To check or add oil, locate this plug, remove it, and ensure that the oil level is within the recommended range. It's advisable to use the appropriate type of gear oil specified in the owner’s manual for optimal performance. Always ensure the vehicle is level when checking the oil level.
I'd stick with Amsoil gear lube for passenger cars.
Three speed automatic doesnt take gear oil. It takes dexron type 2 automatic fluid.
A 1993 What
The Manual stated the approx fluid capacity is 1.9 liters (2 quarts). They recommended using MT oil # 12345349 or equivalent, it was suggested to me this is to be 5W motor oil, not gear oil.
under the plenum.
10w30.
A Geo Storm typically requires about 4 quarts of oil for an oil change. However, it's always best to consult the owner's manual for the specific model year to ensure accurate specifications, as oil capacity can vary slightly depending on the engine type.
front and rear differentials that is if it is a 4x4
1.6 Liter engine requires 3.2 quarts with oil/filter change.
For a 1990 Geo Storm GSI, an oil change typically requires about 4 quarts of oil, including the oil filter. It’s always a good idea to check the owner's manual for the exact specifications, as variations can occur. Make sure to use the recommended oil type for optimal performance.
30w and if you want i higher quality oil, use synthetic