5 speed auto box Clutch/transfer box

[daviesbike]

i was just wandering on a facelift A8 or S8 when people service there gear box is there anything else to do other than change the strainer and the fluid ??? ie is there 70/90w gear oil for a transfer box ect.... and also how do you determin the life of the clutch and so on ... ? any ideas there ??? just want to make sure i have carried out the service correctly i followed the guide on audi pages but there is no mention of the above ??

[ainarssems]

Normally you just change fluid,strainer, o-ring and gasket. There is transmission oil in transfer box and differential, have not heard of anybody changing it but it surely would not harm to change. Usually it gets changed or topped up when output shaft seal starts leaking and is replaced. I think it is 80W90 GL4 but cannot check ATM.

Not specific to A8 gearboxes but in general some people take valve/solenoid block out and clean oil lines where possible and small metal mesh filters in there and generally clean anything accessible sump etc. Because if oil have not been changed for a long time dirt and gunk settles out and fresh oil lifts it all up but it clogs small mesh filters and you loose a gear or couple. That's the reason of myth that fluid change can kill You gearbox if it is on the way out other one being wrong fluid used. Many gearboxes that fail soon after oil change can be brought back to life with a good clean.

[daviesbike]

thanks for that i have no problem with it but when i use tiptronic and take it to the redline going from 3 into 4th gear it jolts the car its not smooth any more but in drive it seems ok i have just done a service on the box about 1 month ago now so not quite sure what it could be ?