Transnission troubles 2002 Windstari

probably all of the above mentioned

If the alternator was not charging before you replaced it, the problem could be a bad connection between the battery and alternator, or a problem with the computer.
The computer controls alternator output.

are there any codes. it sounds like a transnission problem. sounds like your pressure control shift solenoid is bad and or your over drive shift solenoid is stuck open or closed

If the engine light is on.You will need to have the ECM scanned for the trouble code

I sure can. The shift selenoid is in the transmission. This component uses hydrolic pressure to change the gear ratio and exchange higher gears. You will need to remove the transnission in order to gain access to the shift selenoid. My advice is to get the fuild change or run a detergent/cleaner in the transmission to try and salvage it.

please check the shifting relay some times the relay inside the shifting housing.some times under the steering column or plug in in the etacs system

Don't drive faster than 70Mph! That is over 115 feet per second! Anyway, it's 4WD, correct? Check the fluids in the tranmission and transfer case. You transmission may need to be serviced. Limit your speed to 50-60 MPH and don't shift hard...with a lot of RPM's, when taking off and going through 1st 2nd and 3rd. Drive gently until you can have the transmission serviced.

reset the alarn/immobiliser.........

Your turn signal and hazard flasher assembly is one unit,it is part of your Big hazard button,this was a very common problem with GM they used this same thing in alot of there models with a high failure rate,You have to gain access to the back inside the dash and depress a plastic tab and the assembly pushes out towards you I usually remove dash face and then pull the radio out a little to gain access,the dash face is in with push retainers pull off very carefully,then remove radio but don't disconnect wires just pull out enough to gain access.

Have your car scanned for a trouble code. It is probably the speed sensor at the transmission. They are known to cause this kind of problem.