Supercharged111
Truly Awesome
- Joined
- Aug 20, 2015
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Nope. When I was a tech we had a machine that used the transmission's pump to replace all the fluid. If the car had less than 100k, it worked great. If the car had 200k, it was a matter of weeks before the transmission grenaded. Do not do a complete fluid change on a vehicle with more than 100k on the original fluid.
Ever since 50k, my Mustang had the odd delayed shift and other hiccups. At 100k I dropped the pan, replaced the filter, and refilled the transmission. Ever since then it's run flawlessly. I'm of the opinion now that if you're not rebuilding, don't replace all the fluid. I would love for someone to do a complete, honest, data-driven analysis on why fluid changes cause transmissions to take a dump.
I think jjester6000's strategy of replacing a couple quarts at a time until the fluid quality is good is a solid strategy, but honestly, Trenton, it doesn't sound like your fluid is that bad. Replace the transmission filter and go.
If you're purging a hurt trans with nuked fluid that's different than the OP's scenario of healthy trans and oxidized fluid. I've had a 100% success rate with 150k+ mile transmission purges. Also with sub 150k mile trannies. The Envoy and my 1500 are creeping up on their purge intervals again and they'll get this treatment.