It would help to know year and model (and therefore gearbox model) of your A8.
The 5HP24A in the D2 series (circa 1997 to 2002/3) has several issues and are commonly regarded as "fragile".
I have never experienced this when changing my fluid (I have a 2001 S8), but I have read reports that some filters have pick up tubes that are too long and need to be trimmed back or the gearbox can suffer from fluid starvation, particularly when pushed.
Also check that the gearbox sump has not suffered from any impacts. The fluid pick up is roughly central to the sump at the deepest area (both the oil drain and fill plugs are higher).
Was the work performed by an Audi or ZF specialist? There is a particular fill procedure which must be followed.
The gearbox can also suffer from pressure spikes (particularly in early models) which can damage the Clutch A basket, which is used for gears 1-3. However any damage here will result in immediate limp mode (all gears lit up on the DIS screen and gearbox locked in 4th gear).
SOURCE: 2004 Jeep Wrangler - Clunking Noise when shifting out of Park
It could be lash in the differential which is normal, but it could also be a loose u-joint in the driveshaft. Check the rear driveshaft u-joints.
SOURCE: locating oil filter and sump plug for 323 mazda
dont worry about pulling the wrong plug but just look for the oil pan and there is your little plug that needs to come out!
SOURCE: Hi i have a problem with my selespeed gearbox.The
i had the same problem with mine and noticed that its not the oil,its actually the automatic gearbox fluid(red), its more than likely leaking as the injector(small metal fitting at end of tube) below the filter(big black long tube like thing that clicks over air filter) has a crack in and causes small leaks,the fluids not totally getting into the engine so it misses a gear or goes to neutral at the oddest of times(especially when you stop) new tube doesnt cost too much labour on the other hand does....
havent had a problem since
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