The Highlander
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- Mar 16, 2007
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GM THM 700r4 or 4L60E trannies are weak and often mechanical breakdowns. My Astro van's tranny went out of service in about 95k mileage on it. I overhauled and rebuilted w/ upgraded strong planetary/ sungear assemblies.
Now my van is at almost 170K mileage on it but it is sick right now. I better off with GM reman tranny soon.
Many auto trannies are failures very easy cuz they got poor oxidition ATF due to high tempurature and poor (neglect) maintenance.
Some European vehicles like MBZ or BMW, have lifetime trannies cuz they use synthetic ATF. Never change ATF or filters. Sometime they are problem w/ mechanical or electricals.
Manual trannies can be expensive job if you own a Porsche Caynne SUV. Big
money on clutch job. Subaru? of course cheap clutch job.
Holy shit! I was rebuilt the THM 700r4 before. The instructor told me that auto transmission almost never break. Only break by customer abuse and poor maintenance that's all I know.
You are right about poor oxidation and transmission never happy if it got over 250F (i think) Good thing My 2001 Subaru use synthetic ATF not just European. I believe GM can use synthetic ATF as they are 2005 or newer.