Hi everyone i have a g35 2004 with almost 300k & i notice that after ive been driving for a while when im coming out a stop or on a turn when i dont completely stop it shifts kinda jerky sometimes it even feels like someone bumped me from behind... The fluid is fine i got & no check engine light & it runs fine other than that lil issue... Any idea what it might be???

 

First inspect the driveshaft u-joints and carrier bearing for wear, then check the rear diff input shaft/ring gear for play.

Have you been keeping up on transmission fluid changes?

At 300k there's a LOT of parts near failure so it could be quite a few things, gotta get the car up in the air and start looking.

 

As far as i know fluids have been keeped up.. I have 50 50 warenty so should i take to dealer & tell them check all those things?? Also is it wierd there is no check engine light? & should i have them look @ timing belt? Thanks

 

There is no timing belt it's a timing chain and it wouldn't be causing jerky shifts.

Actually I bet I know what it is, your rear differential bushing is probably 100% shot. Maybe even missing big chunks out of it. You can look up under the car with your phone and take a picture to see if it's missing large chunks, if it's the OEM rubber bushing they're usually pretty shot by 60k miles, I imaging by 300k there's probably nothing left.

Most folks replace them with a polyurethane bushing.

 

So thats under the rear wheels right?? Also can u tell me why this only happens after i have been driving abou 30 to 45 min? Thank you god bless u sorry i just know nothing about cars

 

Yeah it's the rear differential, that's basically the big round part in the middle hanging from the subframe cradle. It might not be the issue but it's a common failure point on these cars however it shouldn't make any difference in how long long the vehicle has been operating.

I suggest you take the vehicle into a reputable mechanic for a diagnostic before something actually BREAKS. That way you can schedule the repair on your own time instead of being stranded on the highway waiting for a tow truck.

 

Hey is there 2 of those one under each tire?