I have a g35 2003 coupe automatic transmission and I noticed sometimes when I'm on the tiptronic mode and I'm in second gear when I'm at a red light and the car goes to first gear just before it completely stops, I feel and hear a clack on the transmission, most of the time it doesn't clack but I hate it when it does, is it normal for it to clack or ???

 

if it is a clack like it is through a pillow, it's probably normal. My car makes a clack/slight lurch when in tiptronic and rolling to a stop. The car is just downshifting.

 

down shifting either on your own or the car its very hard.

 

I know what you referring to, approaching a stop sign and it drops from second to first while you're still rolling. clunk It's normal but mine hasn't done it since I had my AT serviced. When was the last time you had your trans serviced? Just might be the answer to removing the clunk you dislike so much....
Gary

 

Never I just bought the car it has only 50 000 miles that's why I was scared to already have transmission problems, when I called Infiniti they told me they could check the transmission with their computer hardware but it would automatically cost 200$ just to plug in their computer so what you did exactly what do you mean by at serviced and trans serviced I remember I put extra oil transmission but nothing more and thanks in advanced.

 

You should do what's called a "drain and fill" on your transmission every 30K miles. This consists of draining the trans from the pan only and replacing it with new transmission fluid. Usually you'll get 3.5-4 quarts to come out.

 

Id just have them do a fluid and filter service for you. If the fluid is discolored or glittery, theyll tell you. And it probably needs it anyways!

 

must be normal, cause my 04 5AT did the same thing.