Vectra with intermittent shake

[showdown496]

Hey guys, I have a 1995 vectra on the Chevrolet p30 chassis, the coach seems to have an intermittent shake when you drive up around 65 mph. It doesn't always do this, but when it does it seems as though the entire rv is going to shake apart. If you then slow down to around 60 then accelerate back to 63-64 the shaking doesn't seem to be present. What should I look for? I checked the shocks, they are all good, I just cant figure out what would intermittently cause this. Thanks for any help.

[vtbigdog]

How did you test the shocks and determine they are good? Just because they are not leaking does not mean they are working properly. That is what I would focus on initially. Does the motorhome front end go up and down violently when driving over a depression in the road?

[xl guy]

Tire wear may be an indicator of a worn out shock..

[DonDee]

Maybe?

Bell Crank for Workhorse and Chevy P30, P32 and P37 Chassis

[showdown496]

I removed all the shocks and pushed each one in then pulled them back out, each had resistance so I assume they are working. Every bad shock I have ever been around would push in and pull out freely. The shaking seems to be coming from the rear as well, as I said before, it doesn't always do this, but when it does it is always right at 65 mph.

[jerichorick]

The universals in the drive shaft could be failing. If the drive shaft goes off center that would cause some major shaking.