Welcome to justanswer.com
to replace the door handle on the inside you will need to remove the door panel and repalce it. I will give you the info. ON these older vehicles sometimes it is a bit general but should work let me know if you can not see any diagram. I can send again. please let me know if I have anything unclear. first door trim then door handle.
REMOVAL & INSTALLATION
See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10
Remove the armrest.
Fig. 1: Remove the screws securing the armrest
Fig. 2: Unscrew and remove the door handle-on this 1990 Pick-up, it is secured with a hex head screw
Fig. 3: Take note of the correct order of the parts removed
Remove the door handle screw and pull off the handle.
On models with manual windows, remove the window regulator handle screw and pull off the handle. If not fastened with a screw, slip a suitable door handle removal tool behind the handle and detach it from its mounting to the regulator.
On models with power windows, remove the power window switch housing.
Fig. 4: Some door handles require a special tool for removal-1994-96 Pick-up type shown
Fig. 5: Remove the door trim panel with a suitable panel separator tool
Fig. 6: Exploded view of the door panel mounting-1994-96 Pick-ups
Fig. 7: Some accessory switch controls will have to be removed prior to panel removal-1994-96 Pick-ups
On models with manual door locks, remove the door lock control. On models with power door locks, remove the power door lock switch housing.
Fig. 8: Exploded view of the Dakota door trim panel mounting
On models with electric outside rear view mirrors, remove the power mirror switch housing.
Fig. 9: Exploded view of the door trim panel mounting-150-350 series Pick-up and Ramcharger
Using a flat wood spatula, or equivalent tool, insert it carefully behind the panel and slide it along to find the push-pins. When you encounter a pin, pry the pin outward. Do this until all the pins are out. NEVER PULL ON THE PANEL TO REMOVE THE PINS!
Fig. 10: Exploded view of the rear door trim panel mounting
Install by positioning the panel on the door and pressing the pins into position.
On models with electric outside rear view mirrors, install the power mirror switch housing.
On models with manual door locks, install the door lock control.
On models with power door locks, install the power door lock switch housing.
On models with manual windows, install the window regulator handle.
On models with power windows, install the power window switch housing.
Install the door handle.
Install the armrest
Front Door Latch
See Figure 1
Raise the glass to the full UP position.
Remove the door trim panel and watershield.
Fig. 1: Exploded view of a common door handle mounting
Disconnect the clips and/or rods from the handle and lock cylinder, and from the remote control assembly.
Remove the latch assembly attaching screws and remove the latch from the door.
Install in the reverse order of removal.
Rear Door Latch
This procedure applies only to Crew Cab models.
Disconnect the rods from the handle and lock cylinder, and from the remote control assembly.
Door Lock Cylinder
See Figures 2 and 3
Place the window in the UP position.
Remove the trim panel and watershield.
Disconnect the actuating rod from the lock control link clip.
Fig. 2: A common door link attachment to the latch
Slide the retainer away from the lock cylinder.
Fig. 3: Exploded view of a common door lock cylinder assembly
Pull the cylinder from the door.
Install in reverse order of removal
Hope this helps
If this helps click accept thanks again David