How do you change the transmission oil on your 99 Isuzu trooper?

Answer 1

Drive the vehicle up on oil changing ramps. Turn off the vehicle. Set the parking brake. Block the wheels so the vehicle can't roll away. Support the transmission, remove the cross bar from under the tranny pan. Place a drain pan under the drain plug and drain the transmission. Remove all the screws from the drain pan except 2 on each side of the tranny pan ease one of these last two out to drain remaining fluid from the pan. Remove the pan and gasket and clean them thoroughly, remove and replace the filter-check to make sure the rubber gasket from the old filter came out with the filter otherwise use a finger to remove it from the tube. Put the new gasket on the pan use a small dab of high temp gasket sealer to keep the gasket from falling off of the pan, but be careful not to use too much gasket sealer as you don't want it getting into the new tranny fluid or pan. Replace the pan bolts and tighten. Replace the metal support bar and remove the wood blocks you placed to support the tranny when you started the project.

Remove the drain plug. This is where you will have to fill the transmission from as well, here is a tip I came up with to get the job done. Get a step ladder and put it next to you truck toss something over it so you don't scratch you truck and Duct Tape it in place. Get an old plastic jug/tranny oil jug clean it out very well, drill a hole in the bottom of it and put in a screw in plastic hose barb. use silicon gasket maker or similar product to keep it from leaking since you won't be able to reach inside to put the nut on it. Once dry attach a hose to it that will fit up inside of the fill/drain hole in the trooper's tranny pan without kinking and block the outflow of the tube with a locking pliers. Drill a hole in the top of the jug (not in the cap) and put in a tire stem, you may have to go to a bike shop or tire store for this. Clean out the plastic drill shavings and fill 3/4 full with tranny oil. Screw on the cap, shove the hose into the tranny fill/drain hole and remove the pliers, put the jug on the ladder and tie, duct tape it to the ladder so it cannot fall off and use a small amount of air pressure to force the tranny fluid into the transmission pan. Have a drain pan underneath to catch any drips once the pan is full start the vehicle and continue to fill until it drains back into the catch pan. Put the drain/fill plug back in place. Back the vehicle off of the ramps drive it around the block or a down the section to the first field road come back and with the vehicle running unscrew the drain/fill plug add more if needed. There is enough fluid in the tranny when you open the plug and only a small drip comes out or you stick your finger up the hole and can feel fluid on your finger, I prefer the drip test.