vibration in van on 1990 Dodge Ram Van B150

when driving down the road i get a bad vibration especially at 45mph when i let off gas it quits ujoints seem to be good just did a tune up can u email me a wiring diagram for the van plz

Asked by for the 1990 Dodge Ram Van B150
Your vibration can be from many causes. First off, Wheel Balance, Drive shaft balance or a bent drive shaft. Sorry, I cannot e-mail you a wiring diagram for your vehicle as it is about 200 pages. The factory service manual has one entire book dedicated to the vehicles wiring schematics.