if it is an automatic leave it in overdrive. the transmission knows when to change into the overdrive gear. if it is a manual listen to the motor. if you have in overdrive and it bogs down while accelerating then down shift to a lower gear.
If your 93 Nissan Pathfinder transmission won't shift into overdrive, check the transmission fluid levels. Ensure the fluid is at the proper level.
In Nissan Sunny (and some other cars too), overdrive is ON when the button is DEPRESSED and there's NO LIGHT in the dashboard. The automatic transmission will utilise all the 4 forward gears (the 4th gear being the overdrive that helps in fuel economy -- similar to 5th gear in a manual gearbox). This is the recommended setting for normal driving. When the button is NOT DEPRESSED, you turn OFF overdrive, and the indicator LIGHTS UP in the dashboard. In this mode, the automatic transmission will NOT shift into 4th gear.
You can use any kind of SAE certified automatic transmission fluid in your 1993 Nissan Pathfinder. You can check the automatic transmission fluid level with the transmission dipstick.
Valvoline MaxLife automatic transmission fluid is recommended for a 1994 Nissan Quest. The 1994 Nissan Quest has a 4-speed automatic transmission.
On the Nissan 240SX the electric overdrive switch is located on the right side of the transmission. Overdrive allows shifting into the auto's fourth gear.
Nissan
The speed sensor is in the engine compartment on a 1995 Nissan Sentra GXE automatic transmission. It is on the back of the transmission.
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You can find the diagram of a transmission in a 95 Nissan 200SX in the owner's manual. You can also find it at certain auto part stores.
Use only Genuine Nissan Matic J ATF. Do not mix with other fluids. c Using automatic transmission fluidother than Genuine Nissan Matic J ATF will cause deterioration in driveability and automatic transmission durability, and may damage the automatic transmission,which is not covered by the NISSAN new vehicle limited warranty.
10.9 Quarts (automatic transmission)