The transmission in our durango gives a shaking around the same speed, it may be going bad, but has done that for well over a year with no further problems. The shake in our durango feels like something in the front end even though it isn't.

 

well, even under acceleration during that speed 35-42 it comes in for a sec then goes away

BTW: in winter right now im running 32psi front and 30psi rear <-- that being said what would u recommend for winter/summer??

 

well if those are your stock tires you should look on the placard, located in your door jam and see how many psi, I recommend in the winter 35psi and in the summer probly 32psi but run them the same amount all the way around though dont't let them be different air pressure.

 

i figured softer backs i dunno what though...