Hey guys,

I have a 2003 G35 5AT and recently developed an annoying problem.

When driving in 'Auto' mode, there are harsh 'thud' everytime the auto trans gear changes. If I put the pedal to the floor, I have a little bit of wheel spin that I can feel. When I try to put it to 'Manual' mode, the screen in the dash still remains as 'D' rather than the gear number it would be in if using Manual mode.

Note. The problem first started when I washed my car 'Airred out'. I have air suspension installed. The problem went away the next day and didn't reoccur until yesterday (after a weekend of semi hard driving in the mountains) when the rain started pouring down and I 'airred out' on the wet floor. Not sure if this is relevant, but I've been trying to figure out the circumstances that have occured prior to this issue. The problem on my G35 is still ongoing (as with the wet weather). Despite the hard driving over the weekend, the problem didn't immidiately reoccur. It's taken it several days for it to come back so I've ruled out my driving style as the problem that would cause my 5at issue.

Thoughts guys? Any help or suggestions would be greatly appreciated!

 

1. Check your oil. It's probably bad.

 

Car is going to go for a service today. Hopefully fingers crossed it's just the transmission fluid. Is there any other suggestions?

 

Let me know how it goes, I'm kind of having the same problem, except when I'm in the "manumatic" mode and on 2nd gear slowing to a stop i get a hard thud to 1st.

had a similar problem in my z when gearing up i had a hard thud

 

Hey man sucks to hear you have a problem too! Transmission oil wasnt the best so changed that. But problem still persists

 

Oil has been changed. Problem still occurs but not as much as it did before. Shall connect a computer onto it and see if it throws up any codes!