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Drivetrain knocking that gets louder on braking


llessur
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Have finally taken my 2500S project out for its first test drive - goes quite well but there is a dull rhythmic knocking sound when driving. It seems to match the road, rather than engine speed but becomes noticeably louder on braking.

Any ideas as to what this could be or any way of eliminating components? I'm presuming it's either the prop or driveshaft(s). The gearbox mount is a brand new Mackay one so should be good.

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Brand new tyres, only been on the car a while so I can't think that they've distorted yet. Will pop out and have a look and also check the wheelnuts for an easy fix.

If it's a UJ, is it easy to detect which one is worn? Can I just give the prop and drive shafts a good wiggle?

Last time I had a UJ go was on my Spitfire years ago - but I got a garage to change that for me...

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i dont think uj on the 2000/2500 driver shaft suffer like the small chassis ones , 

but easy too pull the whole shaft thro the back plate , just 6 nuts and the coupling and shes off. 

very low  12lbft torque on the 6 nuts .easy to shear them off 

it took my 2000 new alloys a while to settle down, but a couple of  wheel nut  re torques and its never made a sound , but that does give  a good rumble 

do make sure the drum retaining screws are not proud of the drum .

Pete

 

 

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