own a 2000 xj8. The transmission A drum failed a common thing I was told. I had a local transmission shop overhaul with updated A+B drums. It shifts fine but now chatters in the morning when cold and has a humming noise at 50 to 55 mph in drive mode. But when shift to sport mode goes away. Transmission place says transmission is fine and is very common problem with no repair fixes. Can anyone help me? The car did not do this new. Thanks

 

First thing I would ask is...what type of fluid was put back into it? That is very important. That tranny, IIRC, sometimes needs an additive also to keep some whirring noises at bay. Also, a confirmation of the proper amount of fluid will also provide some confidence...proper temperature of the fluid prior to closing it up is critical so just the right amount is in the unit.

There are a ton of threads on here, just search for ZF5hp24, or 5HP24, along with fluid and other keywords for not only the right specifications, but alternatives in fluids, where to get the additive, also outside sources (very reasonable also) for the OEM transmission fluid. Good luck!

 

This kind of statement is almost always a red flag from a shop that either isn't interested in repeating the labor to fix it right or just doesn't know what to do...

I have in the past, under similar circumstances, pressured the tranny shop to either repair it (it didn't make that noise before, it shouldn't now) OR to provide an extended warranty on the transmission (parts AND labor) so if it does become a problem, at least you have some peace of mind.