on the 5 speed manuel theres a plug on the side of the transmission, remove the plug and use a syphon pump to add fluid until it starts to pour out the hole. to remove the existing fluid remove the plug from the bottom of the transmission.
there is none, it uses the same one in front
Take the dipstick out ues a funnel and put it in through the dipstick hole!
You need to drain the transmission to see what fluid it has. In the late 80's and early 90's Isuzu put either Gear lube or Automatic transmission fluid in the 5 speed transmissions.
The Isuzu has a sealed transmission. It has a transmission fill plug on the side of the transmission above the pan, I believe on the right side of the trans case about midway the case body. Take the pan off remove and change filter. Add fluid by using an inexpensive pump until the fluid starts to run out the fill plug hole. Replace the plug. Job done.
If you can put your transfer case into neutral, that's all you should have to do. If not, it gets a bit more complicated.. you may have to remove the driveshaft.
In the transmission.
You put the Transmission Fluid in the Transmission (fill point transmission drip stick tube)
You can purchase the pump at any auto supply store, Auto Zone, O'Reillys. Advance, etc.
The transmission will fail.
Low Transmission fluid
Can I replace my auto transmission with a maual transmission in my 94 trooper
Buy a transmission funnel and pour the fluid in the dipstick tube.