You probably need a transmission pro to diagnose it properly, but it doesn't sound good. Was the original fluid you drained dirty brown? And did you see significant amounts of metal shavings in the transmission pan? The severe discoloration of the fluid is due to the clutch pack material wearing off and dispersed throughout the fluid. If the fluid smelled burnt, it is almost certain the transaxle is toast.
SOURCE: gear shift knob
Usually there is a small metal clip at the bottom front of the shift knob (looks like a staple.) Just pull it out and pull the knob straight up.
SOURCE: Hard Shift to 2nd Gear/next gear
Your going to have to get your car scaned for codes. Auto Zone can scan it for you for free and tell your what you'll need to fix it.
It sound's like your VSS Sensor (speed sensor) is not working and your ECM is not getting the signal from the transmission to know when to shift the gears.
Becareful not to burn out the transmission till you get it fixed. The sensor it self is not that expansive and to replace it is easy and takes about 30 min to do.
If you get a P0720 or a P0722 code, then it's your speed sensor. It's an esy fix and Auto Zone can give you instrction on how to change it.
Good luck, it takes about 30 min to change and hope this helps.
SOURCE: how to change light bulb in the gear shift of 06
Remove the center console.
There will be a bulb underneath the PRNDL(Park, Reverse, Neutral, Drive, Low) - quarter turn to the left. Pull bulb down; put new bulb in - put back in hole quarter turn to right - reinstall center console...
SOURCE: I need to change the Transmission control solenoid
Check or replace your TPS (throttle position sensor). The other reason for hard shift is a worn Boost valve and will need to be replaced, or a faulty transmission fluid EPC (electronic pressures control valve). Both Boost valve and EPC are located in the Valve Body and can be replaced with out dropping the valve body, but have to drop the transmission pan. Good luck and keep me posted, be glad to answer any questions you may have.
SOURCE: 1-2, 2-3 Shift solenoids on 2001 Grand Prix GT
I just did this today just lower the subframe it was plenty of room and didn't have to take it out
The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems.
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