Anyone know why changing tranny fluid would make it not go into gear it clicks into park

 

what year range rover???

 

1998 and I noticed I could never adjust the drivers side mirror but from park to reverse it goes up and down

 

Did you drop the transmission pan or just drain and fill the transmission?

Your mirror problem could be related to the window switch pack. Does the mirror motor receive power when you are using the mirror switch?

 

I dropped the pan installed new filter and added 5 quarts dextrin 3 tranny fluid then nothing

 

No I have never been able to figure out driver side mirror passengers is working on both sides of the switch

 

So when you took the filter out, you most likely have a incorrectly installed o ring on the filter (3:55 in the video). This allows the air to get sucked in instead of pulling fluid thru the filter giving you no movement. Pretty common mistake and worth check before doing anything else.

 

You need to check the power and ground signals at the driver's mirror with a volt meter while using the mirror switch.

 

Also when I go to start the car it says transfer nutural never saw that before it shows that Obote the odometer on the dash

 

Double check the connections at the transfer box shift motor. This message can be caused by a few things. I would recommend having some look at this with Land Rover experience. Do you have any diagnostic equipment available?