Now that the Sammich Maker has her Mazda CX-50 I guess the 2006 Tacoma PreRunner is "mine" again. I have been really worried something in the transmission was getting ready to explode due to a "shutter & shake" as the torque convertor locked up in the 35 mph range. I went down the rabbit hole and compared a few knowledgeable theads on TW and a few other similiar forums with the same transmission.
Little history - when Toyota first sold the 4.0 V6 w/ auto 4 speed they sold the trans as a sealed unit needing only fluid changes ever 100k miles. In a few years that was quickly proven wrong but not aggressively published by Toyota apparently. Before the end of the 2nd gen Tacoma / 4th gen 4Runner the service would be a fluid change every 60k miles and a filter change recommended ever 120k miles apparently.
I have done the drain and fill fluid changes but never a filter change. Today I added a recommended additive to deglaze the clutch pack and drove it around. I noticed it was shifting better at the end of 30 miles so I feel confident I am on the right track. Next I am going to order fluid, filter, and additive to do a basic service on the transmission.
Overally it will be nice to have the Tacoma back as a trusted DD again so I can keep some miles off the 2001 4Runner. In fairness the Taco has 378k miles and the 4R has 428k miles.
