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You need the right equipment and knowledge to do this job there are a lot of cables wires etc that need to be removed before the gearbox can be loosened and removed.
There are also a lot of special tools required and the job is best done on a ramp or pit to gain access.
Trying to do this on the ground would be difficult and very dangerous also the engine needs to be suspended when the gearbox mounts are removed.
It is impossible to remove the clutch pressure plate, plate and hydraulic bearing on the C4 without removing the gearbox.
Take it to a garage/ clutch specialist.
i suspect a LAY SHAFT BEARING but without a drive i couldnt say ,if its the pinion and crownwheel then i doubt this but it just needs setting up to a wiggle woggle on the backlash this is achieved by moving the crownwheel in or out of mesh with the pinion by adjusting the cap bearings ,but removing this gearbox and playing around with it on advice of who knows who is not advisable ,with it on the bench in front me i can do this adjustment with my eyes shut and just feel it but its taking it out for starters ,now this tiptronic type box with the paddle controls or whatever uses hydraulic transmission oil in the gearbox which doesnt do the crownwheel any good at all as EPoil is needed for this and it has the same oil as the autoboxes ,best advice is to find one in the scrapyard and just change it complete.Like the early minis with automatic gearbox and the engine oil running through the lot .URGH showing my age here i think
the rear part of the transmission tunnel curves underneath the back part of the gearbox so you cannot just lower it down as you can with most rwd cars. the gearbox must be brought forward a fair way to clear this. you easiest option is to remove the engine and gearbox together, split them out of the car, and bolt them back together to refit both into the car at the same time.
remove the wheel assembly,strut and lower control arm on the side with gearbox,release mounts and surport engine with a trolly jack lower jack till gear box is clear and remove trough the space left by components removed
had exactly the same problem with mine, its in my mates garage as we speak. he had to take the engine out open the gear box and check the bearings. All the bearings were worn !!!! had to buy a wole bearing kit, £170 . plus labour, lot cheaper than getting it reconditioned by specialists!!! they wanted £1000 for doing exactly what my mate has done for me. Hope this helps you!!!!!!!!!!!!!!!
I assume you are talking about the clutch to the transmission. They make a tool that will support the engine and allow you to remove the gearbox on most cars without removing the engine. It is a tight fit but much less work.