truck shaking

When I am in drive and stopped my truck shakes really bad to where you can see my rear window vibrating. Also while cruising down the road at any height my drive train will also shake. Any have any pointers on what to start replacing to cancel out the problems for a less stressful cruise?

oh yeah its a 1990 Chevy S-10 4.3 tbi automatic and 4 linked. please help guys! thanks

tire balance? bent or unbalanced driveshaft? wrong pinion angle? Bad Tire? too much caster (alignment) ?

thanks for the drivetrain info rob.. Anyone have anything i can do about my engine running so ruff at idel? it doesnt die but it runs so ruff the hood,steering wheel, back window and everything vibrates like i have 4 15" subs.

temp sensor right next to thermostat, if it idles ruff as hell and when u get goin smooths out a lil? motor mount maybe?

yeah, i was about to say motor mount Probably not a tire issue since it shakes when it stopped

well I just got a new drive shaft balanced and all that good stuff. Mine was bent beyond repairable. But the truck still shakes. Under normal acceleration and driving speed it shakes and vibrates. But like 55-60 and laying into the gas its really smooth. Can anyone help me here?

The pinion angle is at the correct angle too.