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<blockquote data-quote="Red2018" data-source="post: 31136" data-attributes="member: 11410"><p>You don't need to disconnect any lines or do the procedure as Gm recommends to to change the fluid, just put a drain pan under the transmission and remove the drain plug. Leave it drain for a few hours since it takes time for the fluid&nbsp; pass through all the passages to remove most of the fluid and then reinstall the drain plug. Do Not over tighten the plug (3/16 to 1/8 between the bolt head and the pan outlet face) or you'll strip the threads. Measure exactly how much fluid was removed and add the exact amount through the fill hole by removing the filler cap at the top of the transmission. You may want to do this whole procedure twice if your fluid was really dark to flush out most of the dirty fluid. I don't recommend a reverse flush if the transmission was never changed, the debris will plug up tiny passages going in the reverse direction and then your in real trouble. Finally only use AC Delco dexron VI fluid made for the transmission, don't use the universal fluids that claim to cover all makes, you'll only get a dexron III capability.</p></blockquote><p></p>

[QUOTE="Red2018, post: 31136, member: 11410"] You don't need to disconnect any lines or do the procedure as Gm recommends to to change the fluid, just put a drain pan under the transmission and remove the drain plug. Leave it drain for a few hours since it takes time for the fluid pass through all the passages to remove most of the fluid and then reinstall the drain plug. Do Not over tighten the plug (3/16 to 1/8 between the bolt head and the pan outlet face) or you'll strip the threads. Measure exactly how much fluid was removed and add the exact amount through the fill hole by removing the filler cap at the top of the transmission. You may want to do this whole procedure twice if your fluid was really dark to flush out most of the dirty fluid. I don't recommend a reverse flush if the transmission was never changed, the debris will plug up tiny passages going in the reverse direction and then your in real trouble. Finally only use AC Delco dexron VI fluid made for the transmission, don't use the universal fluids that claim to cover all makes, you'll only get a dexron III capability. [/QUOTE]

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