Well,the Lag 2 came back to be repaired today and it was the offside shaft.
Heres some pic's,the damaged area of the shaft is circled.It doesn't look too bad in the pictures,but there was quite a dip in the surface.....
What looked to have happened was that water had got into the joint and corroded one of the bearings,this then wore the face that it runs up against.Heres a pic of how the joint fits together(it's usually covered over with a rubber gaiter and is packed with grease,but the gaiter has been pulled back and the grease washed out to show things easier.
As the shaft rotates the bearing tripod moves in and out of the housing.Every time the bearing hit the dip in the housing it sent a vibration through the transmission causing the vibration.The problem was really apparent in any gear above third,and got worse as you accelerated.This car in particular felt like the complete front end was going to fall off at 50mph!.As soon as you backed off the accelerator,it was fine.Obviously under power the driveshaft joint is under more strain.
The complete offside driveshaft assembly....
A/Inner splines that sit inside the differential in the gearbox
B/The bearing that sits inside the mounting on the back of the engine block
C/Inner CV joint
D/Inner CV gaiter
E/Outer CV gaiter
F/Outer CV joint
G/Hub nut which holds the outer splined end of the shaft into the hub(where the wheel bolts on to).
The shaft was a recon unit from Partco,retail £190+vat.
It is a reasonably easy DIT fit,you'll need a 32mm socket and strong bar to undo the hub nut,a jack and axle stand to put the car in the air on,a 24mm open ended spanner to undo the lower joint nut,a hammer to break the taper on the joint,and then you pull the lower arm out of the hub carrier.You then pull the hub away from the shaft,then undo the two 10mm bolts holding the horseshoe clip which holds the mounting bearing in place.You then pull the whole shaft out of the gearbox and bearing mounting.You'll need a drain tray to catch the gearbox
This shaft was replaced on a 6 speed 2002 Laguna 2 1.9dCi.The gearbox filling proceedure and the
needed are covered elsewhere on the forum,and it is very important you follow the proceedure correctly.The PK6 box is fragile at the best of times,let alone if the incorrect amount or incorrect
All in all a cracking thead(thanks to all that have added to it
) and a very happy customer.
.He's coming back for us to sort a few other things out on the car next week,so lets hope he stays happy!.