93 TransSport with 3.8 L:
When finishing up a kickdown pass at high speeds (70 MPH +/-) I get a very unhealthy mule kick of an upshift. After overtaking the slower vehicle and when pulling back into the normal traffic lane while very gently backing off of the throttle, the shift back up feels like an extra stiff kick in the pants. It is alarming!
It doesn't happen everytime; just during the more aggressive passes. I was driving through the mountains on a long trip so the vehicle was well warmed up; I don't know if it would do it before it was warmed up.
(This tranny was rebuilt a few years ago. I have always wondered how good of a job they did? There was an annoying whine present before the rebuild (it wasn't me
) and it was still present after the job was completed. I think that might be the hydraulic pump?)
What can I do in the way of code scans? Is a special code scanner required for this tranny or does an engine scanner (available at an auto parts store) do the job? Are there "most likely" parts I might replace without bothering with a scan? I'm pretty sure the fluid is right up. I will double check.