More than likely the shocks are worn out and need replacing.
Check your wheel bearings and at the same time check your brake pads.
40 psi
40 psi +/- 5
.40
Dodge recommends 5w-30. 15w-40 if it is the 5.9L Diesel.
40 psi plus or minus 5
sticking governor,
.035 inch
40 psi +/- 5
40 psi +/- 5
A 1500 has 20 total. A2500,3500 has 32. A 4500,5500 has 40.
wheels off van raised engine shakes side to side at 40 kmh