bad vibration

[colin timney]

when driving between 45-65 mph at around 3000rpm and only when i put my foot down the truck vibrates i have done all the usual checks such as the wheel bearings, exhaust i've even changed the big machos for road tyres but this still happens anyone got any ideas.
colin

[andrewlee31]

grab hold of your prop shaft and try and twist the universal joints either side mate. sounds to me like you have bust a UJ

[colin timney]

grab hold of your prop shaft and try and twist the universal joints either side mate. sounds to me like you have bust a UJ

i'll go and look now

[colin timney]

when i move it there is about 4 mm play on to the bit towards the rear axle, does this mean it will need replacing.
so i don't seem to be using technical words but i hope you know what i mean.
colin

[andrewlee31]

just grab both sides of the joint and there should be virtually no twist at all in the mate. if you can feel twist then look hard and you will see a broken bearing or snapped uj shaft on there. but dont worry they are cheap and an esy diy fix

[colin timney]

yes there is a lot of play that explains the vibration because it seems to be at your feet when it is driving.thanks drew.
colin