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Dextron 3 Transmission fluid
Remove the transmission dipstick and read it, it will tell what fluid to use.
If it is an automatic transmission it should use Dextron 2 type of transmission fluid. If it is a standard it will use a heavy gear oil. Auto parts stores should have the volume needed if you are doing a fluid change.
Mercon works.
Mercon works fine.
Check the transmission dipstick, it is written on the stick what fluid to use.
It is marked on the dipstick what ATF to use.
There is a plug on the side of the tranny. take it out. If fluid runs out, put the plug back in the hole and get on with life. If no fluid runs out, check your manual for what transmission fluid to use. Fill it till it runs out at the plug a bit. Be sure to use the transmission fluid recommended for Chevy S10 5 speed manual transmissions.
Automatic? Read the information on the transmission dip stick, it will tell you what type of fluid to use. Standard? Use Mercon.
for models older then 1996 you use 90 weight gear oil. 1996 and up you use tranny fluid.
Always use syncromesh fluid from the dealer.
Pull the dipstick out of the automatic transmission and read it, will tell you what fluid to use.