I have a 1999 TL-P with 66k miles on it and when it has been sitting for a while, lets say over night, and you put it in reverse theres a big KNOCK. Its the normal noise the car makes when going into reverse only louder. After the first time it stops until I let the car sit for a few hours again. Any idea what this is? I posted this a while back in the TL forums but no one seemed to know so I posted it here to get everyones input. I am just afraid my tranny might be going

 

if you are on a hill it would make that

 

Totally normal. When was the last time you replaced the tranny fluid. Mine does the same thing (99 as well). Once the car warms up a bit, it's not as noticeable. After I do a tranny fluid change, it's even less noticeable.

 

awww I see, no its not on a hill but NSXNEXT I will change it, what kind do you recommend?

 

Use Honda/Acura fluid only - tranny work is the only thing I do at the dealer - for some reason it makes me feel better to have dealer recipts to show the work for this particular part.