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it is on the underside of the motor.
agatesr@att.net
The Geo Storm, Isuzu Impulse, 91 Lotus Elan and several others share the same transmission housing w/ different gearing. The Isuzu manual transmission fill plug is the speedometer cable gear hole on top of transmission. Leave the speedometer cable connected, loosen the one bolt on the retaining plate. Remove the gear. Above the gear you will notice fill marks, low and high. 1st drain the transmission when the fluid is hot as to keep particulate in suspension. Then replace the drain plug and fill w/ something slightly less than manufacturers listed capacity. 1.9L or 4 U.S. Pints on the Isuzu. Wipe the gear clean, place back w/o retaining plate, remove and check level. Repeat until adequate. Replace gear and tighten retaining plate.
If you remove the intake hoses, you will see a 17mm bolt on the transmission. More toward the passenger side of the car, that is the fill hole. And just below that will be a 24mm bolt which is the bolt used to remove the transmission fluid.
There is a fill plug and a drain plug located on the transmission the upper bolt is where you would fill it at. need a socket or wrench. you fill it till it runs out level of the bolt hole.
You remove the fill bolt on the transmission and fill it there. It is easily accessable with a floor jack or ramps.
there should be a fill plug on the side of the transmission case. its a bolt the size of a quarter.
1992 - 2002 Isuzu Troopers have the GM 4L30E transmission. There is no dipstick. There is no fill tube. The only way to add fluid or check the fluid level of the transmission is through the fill plug in the transmission pan. The transmission fill plug is situated above the fluid level of the "sump" area of the pan. Add fluid by pumping it into the fill plug and let any excess drain out. You'll know it's topped off when the fluid stops pouring out.
Next to the firewall on the transmission the speedometer cable enters the transmission. There is a bolt that will let you remove the speedo cable. This is were you fill the transmission. Fill until it is copletly full.
Should be a drain plug at bottom of transmission Should be a fill plug at side of transmission - fill to this level
there is a nut on the driyer side of transmission you need to remove and fill with a extension hose
there is a drain plug and a fill plug on the underside of the transmission. you need to use the fill plug. You can not fill the transmission fluid or check the level, any other way.(it is a ridiculous design, i know.....) go to autozone.com look under Isuzu repair info, then choose the year and choose "trooper".then look under "fluids" the info will be there.