2005 auto tranny
#1
2005 auto tranny
while driving 110 km the tranny started to downshift on its own all the way to 1 st quite a quick stop. tranny shop said no electrical issue and when I picked it up is started to down shift in about 10 miles when warm. I changed the filter ,oil and shift module as o seals looked distorted. I noticed the tac wavering just before down shift. Now the speedometer is reading less than the speed and bouncing all over, the tranny seems to shift OK but have not gone to far because I was thinking speedo may have something to do with the tranny problem
#4
From what you are describing I would lean towards a failing speed sensor. Do you have a CEL on? Not sure which TC your blazer has,but here is where the sensors are located. The part time case has only one sensor. The full time has 3 that are all the same. If you have a full time case just remember that the fluid is the AutoTrac type. Good luck
Last edited by Transman304; 03-12-2018 at 06:18 AM.
#8
Thank you again for your help it was a speed sensor, do not know why 2 different tranny shops did not know right away, 5 minute fix and Dorman parts is suppose to be improved to avoid future problems. The old girl lives to fight another day.
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