duke39

tta300, I did as you mentioned and it works! Before I shifted through the gears, I tried driving it and the problem persisted. I then parked and shifted through the gears, and then resume driving with shifting success. I'll check with auto shops to see how much it is to replace the neutral safety switch. Thanks for your help.

The problem started about a week ago, only occasionally and not during every driving session. It would occur after I come to a stop and then try accelerate to 40 + mph. When I first noticed the problem, I would pull over and turn off/on the engine and the shifting would resume as normal. But lately, the problem has been consistent at starting and after I begin driving. -Thanks

Hello, I'm a first time poster to the forum. I have a 99 RX300, fwd, 128K. I have just recently experience a problem of not being able to shift from 3rd to 4th gear. After getting to 40 mph, it appears that there's no up shifting for any speed higher. The RPM at 60 mph is around 3K, and 70 mph is around 4K. I checked my fluids (oil and transmission) and they appear to be in line. I don't know if this is the beginning signs of a transmission overhaul. I'm planning to take it to nearby shop next week, but would appreciate it if anyone has any insight or has experienced a similar upshifting problems. Thank you in advance. My apologies if this topic has been covered in a past thread. Best, Can