Hi everyone, this is my first post on this forum, however not my first time asking about this problem that I’ve been having with my transmission.

So, pretty much what’s happening is I’m getting really hard shifts from 1-2-3-O/D. It’s almost like a little shudder between shifts. Sometimes it shifts perfectly fine. If I shift the car manually using the gear level, it shifts perfectly fine. Has anyone else ever had this problem before?

Another thing that I have recently noticed it doing is shifting into O/D even though I pressed the O/D off button. What could cause this? I have a 00’ so I have a kickdown cable which I’ve already tried adjusting. It made it a little better when I loosened it up but it’s not as good as it should be. I’ve done 3 drain and fills and replaced the transmission filter. I have also added a transmission cooler with an inline filter. I will attach a couple pictures of what the pan looked like when I pulled it off.




Please anything helps. I really don’t want to have to replace the transmission. Thank you!

 

These are generally very robust transmissions (mine has over 500,000 miles and has never given me an ounce of trouble). Are you the original owner?
if you're not the original owner, I wonder if the truck suffered from the 'strawberry milkshake' at some point. If the transmission cooler in the bottom of the radiator fails (they do), coolant & transmission fluid will intermix.
For what it's worth, I've preventatively replaced my radiator a few times over the last 20+ years. I've also done a complete transmission fluid flush (not drain & refill) every 100,000 miles.
Lastly, I dropped the pan and replaced the filter for the first time around 440,000 miles - because I was curious.



Andreas

 

thanks for the response and sorry it took so long for my reply. I’m not the original owner. I bought this car about a year and a half ago. I don’t think it’s had strawberry milkshake because it had the original radiator on it when I bought it. I have since replaced it because it had begun to brown on the top so I could only imagine what the inside looked like. I’m really leaning towards this being a tps problem or a kickdown cable problem. When the throttle is fully depressed, should the kickdown cable be completely out as well? Is it possible for the kickdown cable to go bad through the years or stretch or bind?

 

My husband and I are rebuilding a Transmission out of a 2003 Tundra SR5 4X4. Tore it all apart and inspecting everything. Measured the Sun gear Race and Thrust bearing for rear planet, both measure at 1.12 inch and the diagram shows me it should be 1.09. I'm assuming heat could of caused it to expand. Also the transmission pump shaft measures 3.28, not 3 inch. The information I read is that Lexus 450 utilizes a measurement of 3.375. The shaft is a little recessed, it could possible be the 3.375, its definitely not the 3 inch. Which is strange because I'm reading that the 2003 Tundra should have the 3 inch. The Transmission does read: 30-40LE serial number 02HR 20288. Any advice would be greatly appreciated.