20 Oct 11 19:48, Mark Hofmann wrote to Roy Witt:   
      
      
      
    RW>> Not only that, but the ECU tells the transmission when to shift and   
    RW>> how much hydraulic pressure to apply. The dealer, or you if you have   
    RW>> a tuner, can change all of that.   
      
    MH> I thought you needed a replacement chip that was programmable?   
      
   Don't know about the late model Mopars, but GM CPUs have been programmable   
   ever since OBD-1, c1993...OBD-2 (c1995) is even moreso.   
      
    MH> I have software for monitoring settings of the ECU but it doesn't   
    MH> program anything.  I can record trips, etc and watch the different   
    MH> sensors in action.   
      
   Look into the HP Tuner...it costs around $500 for the program, dongle and   
   a license for one CPU (they use the VIN that's programmed into the CPU   
   for licensing purposes). I forget how much an open license is, but if you   
   work on cars for a living, especially if you have a dyno for tuning (I   
   don't), it's worth having. For me, it's a lot of fun to tinker with the   
   CPU settings and note the performance differences.   
      
    MH> I had to drain some transmission fluid from my car after the rebuild.   
    MH> They had put too much in and it was "foaming" on the dipstick.  This   
    MH> will cause the torque converter to slip in and out at times in 3rd or   
    MH> 4th gear.  Once I drained some out, it had not missed a beat since.   
      
   Does it have a plug in the pan? Or did you syphon through the dipstick   
   tube?   
      
      
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