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Originally Posted by directory
it's always a good thing to do--every 30000 miles or so.
issues? not really. drop the trans pan, wash and wipe it clean, install new filter and gasket--reinstall pan--fill with trans fluid.
there are more detailed instructions on the FAQ's page (located at the bottom of my sig--click joe isuzu for more info.)
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Wow! That sounds SO easy. Too bad it isn't - At least not on a 4WD.
Drop the trans pan: That includes supporting the transfer case at the rear, removing the trans/transfer case crossmember, then removing the rear transmission mount so you can reach the three trans pan bolts at the extreme rear.
Then the cleanup, old filter removal, and assembly with the new filter. Don't forget to clean the magnet in the pan:
Install new filter and gasket--reinstall pan: I'd suggest reusing the OEM pan gasket if at all possible, or purchasing another GM/Hydramatic pan gasket. The gaskets supplied with filter kits are typically cork, and will never seal as well as the original nitrile gasket. I usually throw them away and use the original when possible, since leakers are no fun.
Once you reinstall the pan, don't forget to install the trans mount, torque to 34 ft/lb, and install the six crossmember bolts. Since you had so much fun removing them (you'll see) be a nice guy and apply anti seize to the bolts before assembly. You may be the next one to deal with it.
Fill with trans fluid: This is easy enough, so long as you flip the vehicle upside-down, have an ATF pump in your shop, or use an oil suction gun. The suction gun works quite well, but remember to clean it out thoroughly before using it to pump fresh fluid in. Expect to pump in just under four quarts.
Use only Dexron III as recommended by the manual. Plan on doing this every 30K miles if you tow with the truck, or every 50K miles otherwise. I know the factory suggests 100K intervals when not towing, but that's well beyond their warranty period, too. If they even
suspect you have towed, hauled, or used the vehicle in cold, hot, or dusty climates, you have no warranty.
A flush via the cooler lines is not a bad thing, but it doesn't do anything for the filter, or the debris in the pan. Ideally, draining the pan and torque converter would be best.