Exactly, I always do a complete fluid replacement as well; the voodoo about old fluid retaining clutch material that keeps the trans working is intellectually offensivePersonally, I'm a fan of full fluid replacement. I've done it on every vehicle I've bought used (4 of the 5 in my Sig), and I do it as part of routine maintenance, every 50k (or less, depending on duty cycle).
The Denali (bought used in 2015 at 70k miles) now has 160k miles.
The Suburban (bought used in 2013 at 100k miles) now has 268k miles.
The 2001 Suburban was bought in 2005 with 75k miles, now has 320k miles.
All transmissions still function perfectly. And we don't drive like grandma.
Thoughts on a transmission drop and refill
- Thread starter Denali GMC 87
- Start date
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strutaeng
Full Access Member
Agree!
PSA: The idea that a transmission will fail because you replaced the ATF is a really outdated wife's tale...
The whole idea that "grit" from old ATF helping clutches hold is pure BS. Unfortunately, I have heard this regurgitated from even some otherwise reputable mechanics on YT. If the clutch material already came off from the clutch plate itself, means in can't physically help clutches engage. What folks don't realize is the key for a clutchpack to engage is: the clutch material is BONDED to that backing plate.
On the contrary, old ATF with a lot of clutch material floating around will cause severe wear to the pump, bearings, bushings, and valve body hydraulics. No different than neglecting to replace the engine oil.
PSA: The idea that a transmission will fail because you replaced the ATF is a really outdated wife's tale...
The whole idea that "grit" from old ATF helping clutches hold is pure BS. Unfortunately, I have heard this regurgitated from even some otherwise reputable mechanics on YT. If the clutch material already came off from the clutch plate itself, means in can't physically help clutches engage. What folks don't realize is the key for a clutchpack to engage is: the clutch material is BONDED to that backing plate.
On the contrary, old ATF with a lot of clutch material floating around will cause severe wear to the pump, bearings, bushings, and valve body hydraulics. No different than neglecting to replace the engine oil.
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