![]() I have a 1999 Lexus RX 300, and have had about 71K miles on it, and recently had the car breakdown about 240 miles away from my home. Now I admit we should never have had this problem until after many more miles but we have it and I hope this helps you and others out there.good luck. I must say my transmission shifts like it was new. Thousand miles and my rx started doing the same thing again.what was happening is the metal clutches were not getting the proper lubrication and the torque converter was not either.so I had the dealer flush the transmission again and clean the screen filter and this time when I had them replace the fluid I added a product called TRANSMATIC this product thins the transmission fluid to help it get to the critical parts it should. most likely the screen filter is clogged.if you dont mind getting under you vehicle and getting alittle dirty you can drop your own fluid and clean the screen yourself and replace with new fluid.note the dealer charges about 300 dollars to do this they will also flush out all the old fluid which is about 15 qts.when I did this it was good for about 8 to 10 If your symptoms are neutralizing, it is in drive or reverse yet acts like it is in neutral. after a lot a research and trying a few different avenues this is what I found. ![]() I thought this is rediculous for this vehicle this is a Lexus the transmission shud never give us this kind of problem. I have a 99 rx300 awd it now has 110k on it but at the 80k mark I began having transmission trouble I was told the same as you 4500 to5000 dollars to replace it. I now have 110k on my RX If I had listened to the dealer at 80k when I first had the problem It would have cost me 5 grand and my warranty would be gone as it is I have spentģ00 to flush my transmission and clean the screen and 30 bucks for the Transmatic.The transmission problems you are having with your rx300 seems to be all to common.you did not list the symptoms or problems of the transmission. No kidding.if you flush your fluid and clean the screen filter and add a pint of TRANSMATIC you shouldĪgain I am only trying to help.I dont think any of us should have ever had this problem to begin with but we do and we have to handle it. ![]() If you take your vehicle to a dealer or a transmission shop more than likely they will tell you "its internal" This robs the transmission again of proper lubrication and so the transmission shuts down. When fluid does not get to these points the metal rubs against the moving parts and thus shavings gather in the metal screen called the filter. The problem with the design of this transmission is getting and keeping fluid to the clutches and torque converter to keep it from failing. I put it in my RX in December and for the first time since I can remember the transmission shifts properly and performance I was not expecting. It costs about 30 bucks and is avail by just typing transmatic on google. ![]() The slipping and hard shifting and just not working transmission on the RX300 and RX330 is from a design flaw just as RX in NC states but we can use a product that I have found that helps tremendously and extends the life of our transmissions it is called TRANSMATIC and no I do not work for them or sell for them I only purchased and use the product. I know they have now sent out an update to this and it is recommended every 15k.all that aside I want to try to help anyone (and it seems like we have alot) out there that is currently having problems to see how we can help them. You both are correct.I always have had my dealer service my 99RX if you check the manual and according to the service tech the fluid in the transmission should be changed every 30k and on the 2001 RX it actually says that you never have to change it.lets get real. In 2004, and after, the RX uses the e-throttle control firmware to delay the onset of engine torque development and therefore "protect the drive train". Sorta like "feathering" the clutch with a stick shift with the throttle wide open, except with an automatic you don't get that horrid clutch burning odor until you check your ATF at about 40,000 miles. The result of that, for vehicles with hard connections from the gas pedal to the throttle valve, is that the engine RPM is rising at the same sime the transaxle is downshifting. In any case IMMHO these transaxles are FAR too quick to upshift in throttle closed coastdown circumstances and that oftentimes results in being in too high a gear ratio if the driver suddenly re-applies pressure to the gas pedal. There may also be some modivation to reduce the number of accidents due to loss of control from engine compression braking on the drive, front, wheels. Methinks the "flaw" is the result of Toyota and Lexus assigning too high a priority to improving fuel economy.
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