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Originally Posted By: chrome Does the transmission whine when cold? That is when the fluid is at its highest viscosity. If it whines when cold too, then a thicker fluid will probably not be the solution. My transmission whine only when hot. No noise at all when it is cold. I have done lots of...

Originally Posted By: Ibrahim Only at the time of final shift, when "shifting up", I must admit the process has become buttery soft with D4 ATF but it whines, and this is a recent phenomenon.... This looks like a clogged tranny filter

Originally Posted By: Ibrahim I have been using Amsoil ATF from the beginning, last year for some reason I used RP maxATF, I do yearly ATF change, just drain and fill... Last time I changed the gasket and the filter was little over two years ago... 2 weeks ago i noticed the gear when going...

Originally Posted By: bmwtechguy If you do a cooler line flush, you can get all the old fluid out without wasting so much expensive fluid on drain and fills. I might waste a quart or two more than the listed capacity during a flush to get a complete changeout. You won't know if the new fluid is...

Originally Posted By: Wilhelm_D Originally Posted By: dkrivosheyev The whine unfortunately did not go away although it was not as loud as with T-IV fluid. Which tells you the noise is mechanical and wear-related. Yes, I know where the noise is coming from - this is a known issue with some...

3 drain and fills will be rather expensive - I think D4 is like $10.00 a quart...

I changed the filter 20,000 miles ago, my toyota has 117,000 miles on it. The filter was relatively clean. It is very easy to change the filter.

After some extensive research I went ahead and switched from T-IV ATF in my 2003 Toyota Echo to Red Line D4 fluid today. My main reason to do this was to get rid of the light transmission whine between 35 and 50 mph. I had this whine since I bought this car 2 years ago, it does not get better or...

Originally Posted By: RxxR I think that the noise is there when the gear tooth angle is small. The bigger is angle the less noise comes out. When you driwe backwards you hear the gears with 0 tooth angle. Impropper assembling will also make it noisy. And yes, the oil viscosity if lower or...

Originally Posted By: Kestas I got the impression from my dad that the noisy transmission gears didn't always result in excessive wear - just noise. This is true, but also if the oil is too thin the gears will make noise. My UOA came back with a comment that T-IV was too thin at 100C, that is...

Originally Posted By: Kestas My dad - a transmission engineer - explained that it is easy to get whine from a gear if it's not machined exactly to spec. It happens often with older worn machinery. I don't think the gears are worn because the oil analysis did not show any excessive iron...

Hi all, I have a 2003 toyota echo with 115,000 miles on it. It has a slight gear whine between 35 and 50 mph which as I understood is a common problem with Aisin-Warner transmissions. The whine does not get any worse and was present since I bought the car in 2008. I replaced the original ATF...