Truck vibrates over 60mph

[dig-dug-dan]

Bit of an unusual one, as title suggests, get a reall bad vibration anything over 60mph. 

Had front tryes replaced and balanced, no joy. However, brake warning light came on, mechanic replaced all brakes, and noticed one rear barke had seized on due to a faulty handbrake. He released it, bjt a few days later, the other side siezed. 

Its booked in for replacememt cables on thursday, and i have been using reverse gear as a temporary handbrake, but wondering if this brake problem has caused the vibration issue?

I jacked the back of the truck up and got the speed up to 70mph, but no issue?

I should add, its a nissan cabstar

[billpierce]

Prop carrier bearing or universal joint on prop?

[dig-dug-dan]

20 minutes ago, billpierce said:

Prop carrier bearing or universal joint on prop?

Hadnt looked at that. Would the uvj on the front possibly be the issue, hence no joy when lifting the back of the truck up? Steering does not vibrate massivley

[MattyF]

Hadnt looked at that. Would the uvj on the front possibly be the issue, hence no joy when lifting the back of the truck up? Steering does not vibrate massivley

Had front and rear both replaced on my l200 recently and it cured the problem.

[Stubby]

Stop driving on he rumble strip

[woody paul]

Could be slightly bent rear wheel rim or has back axle move in some way so it is not running true you would not notice it when raised off the ground as no resistance.

[PeteB]

Don't know the front axle set up, but Landrovers can get king pin castor angle issues when worn, this can cause an issue but felt through the steering wheel. Or as said, check your uj's 

[woody paul]

Built in speed limiter 

[dig-dug-dan]

1 hour ago, woody paul said:

Built in speed limiter 

I have noticed my mpg has gone up a bit!

[dig-dug-dan]

2 hours ago, woody paul said:

Could be slightly bent rear wheel rim or has back axle move in some way so it is not running true you would not notice it when raised off the ground as no resistance.

Would bent wheel not vibrate when off the ground?