Vibratioin at 30psi and around 1300 rpm

[Trucker66]

Thanks for the advice.

I was leaning toward the carrier bearing to. When inspecting my u-joints I noticed play in it but Master Fabricators in Augusta (specialist in drive shafts) said it would do it all the time, so I'll go ahead and change it because for $100 or less I can eliminate that off the list. They also said some play in there is normal which seems to reason since its polyurethane bushing.