Same thing happened to my car at 48K miles. It was due to a failed o-ring apparently. Same issues as the OP. Replaced under warranty and got an extended warranty after arguing.

 

I am not sure what you have to do to an ISF/RCF tranny to break it! We now have over 60 Supercharged cars on the road with ZERO tranny failures. Clearly, something horrible was done to this car, or its just a very rare defect.

Rafi

 

Just a very rare defect. It has happened to ISFs before (there are threads on CL about it with same issues about Reverse not engaging). I drive my car hard but not that hard to blow a transmission. Happen to the Reverse gear. Lexus will give a refurbish shell with all new internals. I *****ed and got extended warranty.

 

I have to pile on about Lexus honoring warranty. My experience with them so far (currently at about 54K miles) is very good, despite the fact that I have a current disagreement with them over a catalytic convertor. They have jumped on every CEL or other issue I have had as well as the fuel pump recall. I'd be shocked if they didn't warranty your trans.

 

Are they giving you issues about replacing a faulty cat? That would be very strange as they are government mandated and usually have longer warranties than the power train.

 

WELL DannyRCF, it's been over a week now, WHAT'S the status? Can't blame the Dealership for abuse, whether it was the previous owner or you, But IF it was the previous owner that's something YOU should have checked out before you bought it! JMO!