They don`t go in easily so its better to install them off the car. Then after that it is even harder to snap them on to the pivots.
Very true.
It can be done, but it takes someone with skinnier arms, and fingers that work better than what I have – to do so.
I recommend:
Take some tape - masking tape works well. Apply two strips under each - or by each wiper blade and make a mark on each piece of tape the horizontal position of the blade (because arms & pivots are both splined - it is easy to get the splines off and thereby the arm positions are off).
Remove the wiper arms (small/mid-size flat screwdriver, to flick the tang out first - with arm pulled away from glass). Generally gentle rocking the arms (with tang out) 9 out of 10 arms will come off smoothly.
The 1 out of 10 will need one of these tools to pull the arms off of their pivots.
Note: the tips are have molded in plastic(?) to prevent paint damage.
The more common wiper arm tool (above) will not work (but does work for my wife’s ’02 Town and Country minivan or my '97 Dodge pickup).
Once the wiper arms are off get a large socket, or end wrench, to loosen the 12-point nuts (they are not very tight) – which I “think” is 15/16” size.
Remove the black plastic cowl screen.
Remove the ½” stamped steel nut from wiper motor.
Remove the wiper motor arm and rest of linkage from cowl.
On bench, use large flat screwdriver to un-pop arms from bushings (if needed) –
one at a time.
Use channel-lock pliers to pop bushings into the arms. I like to use a large nut to assist popping bushings into the arms (Note: it takes a bit of muscle to do so).
Make sure bushings are in the correct direction!
Use channel-lock pliers to pop bushings onto the ball studs – after adding a bit of grease in, first.
Install the assembly back into the cowl. I recommend installing the pivot nuts on a few turns first. Tighten the wiper motor arm nut, then the other two nuts.
Note: the driver’s side pivot has an extra washer - for the M-body drivers side wiper arm is made differently than most F-bodies are.
Pop black plastic cowl screen back into place (after making sure no tools or body parts were not left inside, first).
If you had to use a tool to remove wiper arms - then use a wire brush to clean off any corrosion and apply a smidge of grease (not a lot) to splines to prevent future problems.
Go get a tall cool one to drink, for that project is done.
BudW