Go to "TheDieselPlace.com" for reviews on T-bar crank. Definetely unload the front end before turning the screws. Just MHO, don't use an impact, use your hands.
I don't have diesel, but I cranked my 2007.
Get the yellow Bilsteins.
I don't know if your model year has the yellow snubber on the lower A-arm, if so, toss it. JMHO.
Edit; It's been a while, so I forgot. The yellow snubber is mounted on the frame.