1. Home
  2. General Motors Forum
  3. Hard shifting tranny

Hard shifting tranny

I recently bought a used 95 GMC Sonoma extended cab pickup truck (4 X

4). I have noticed that after driving it and warming everything up that the transmission shifts hard between 1st & 2nd gears. I have noticed the fluid is a little overfull and appears dirty. Does any one think a dirty filter is the cause of the hard shift. Or is there an accessible part that can be replaced when I have the pan off to change the filter that is obviously the cause. It also has the 4.3 vortec. Auto transmission and A/C.
Reply to
fishguy
Loading thread data ...

Dirty filter affects line pressure / could cause hard shifting. Worn trans fluid [ thermal breakdown ] could do the same. Trans service is cheap insurance against rans failure.

Reply to
Paul

Thanks Paul,

You confirmed my suspiscions. I changed the filter and fluid today, I also added a quart of slick 50 tranny treatment. I've driven it twice today. The first time there was an immediate improvement. The second time was even better. I suspect the new filter is cleaning the remaining fluid in the torque converter.

Reply to
fishguy

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.