samson_420

iTrader: (1)

So, I have been doing a ton of maint work on the 04 CTSv I just got.


Changed the oil twice, swapped out the dex cool & now the trans fluid. The trans was filled with something resembling gear oil. Now, I put in full synthetic Valvoline ATF.

But, the trans sounds just the same - It seems to growl(well, that's the best way I can describe it). It didn't have any metal in the oil that I drained, it shifts perfect without any grinds at all & has no pop outs whatsoever.

But, it seriously has a sound of a true gear box - Nothing bad, but consistent until I get to higher gear(5th & 6th).


Any thoughts? Is this how they all sound?

Fweasel

iTrader: (6)

Are you sure its the trans and not the diff? Obviously one is speed dependent and the other RPM, easy to tell apart, but the reason I brought it up is the diff's are the traditional noise maker in this platform. How's your trans mount look? Original and crushed I'm guessing.

samson_420

iTrader: (1)

Everything on the underside looks fresh - the flex discs don't have cracks and the mount looks very rubbery still

The guy I got it from said it had a LS7 clutch - so it looks like they replaced everything around it when doing the clutch - including motor mounts, they have parts store stickers still on them & also look very fresh


I am use to the rear end noises of all LSx cars. My GTO makes plenty & my old z28 had a beautiful whine on deceleration.


But, this seem to be clearly coming from the shifter area of the car.

NIKDSC5

iTrader: (10)

Well mine made noise. Then I took it to TDP to get rebuilt and upgraded. Had no previous issues except like you're describing. Shifted fine, only growled. And I changed the fluid as well to the ATF MT fluid cocktail at 3:1 ratio. Which made it feel better, but upon rebuild found that damn near my whole shiz was bad. In all it ended up costing 2200$ with the stage 2 rebuild/upgrade. So.....fair warning. Mine had approx 105k miles I think. Food for thought.

Also, Jason said to use ONLY non-synthetic dex3. Not sure why, just know he is the t56 guru so I listened.

Fweasel

iTrader: (6)

My trans shop guy said the same thing, even on the 07 spec. I switched back after my upgrades.

samson_420

iTrader: (1)

What exactly inside the trans is causing this? Maybe excess clearance between the gears.

NIKDSC5

iTrader: (10)

Mine I think was the gears wearing out on the shaft. Possibly the counter shaft. I can't remember honestly. This is something that I just pay for blindly and ask no questions. Of course to only
Those I know and trust or who have a great reputation

samson_420

iTrader: (1)

That sounds about what it would sound like - It's not bad, my wife doesn't even notice it


But, I listen to everything - The exhaust on this car is stock and super quiet. So, everything to me is super noticeable.

isis

iTrader: (1)

Sounds like your OCD needs a louder exhaust.

samson_420

iTrader: (1)

LMFAO!

It is very possible

Woods2390

samson are you running a stock shifter or aftermarket? I know you mentioned the previous owner doing the LS7 clutch and was wondering because the B&M that came in my car is much nosier than stock. Also think that is why 07CTS-V's kit comes with the dynomat to dampen the added noise caused by the aftermarket shifters.

+1 on fixing that stock exhaust problem as well