Klunking when decelerating under 2k rpm's. BRAND NEW CAR!

[ChrisBlair]

Originally Posted by 1LEdabeast1LE

VERY noticeable klunking sound when engaging the clutch (pressing it in) and decelerating under 2,000rpm's. Was told by the dealer that this is drive-line slack? This is very loud and extremely annoying! Anyone had or have this issue?
I appreciate any advice that will help me figure this out.
Thanks.

Hi. There's nothing to figure out

It's normal. Nothing to "fix". Some designs do it, some don't. Ours does. Nothing's broken. You'll learn to drive to minimize it. Enjoy your 1LE.

[ChocoTaco369]

Originally Posted by 1LEdabeast1LE

How can that be normal? 6 years, and no one has figured out a way to fix it? I can only turn the radio up so loud, haha

Because there is nothing to fix. All parts are manufactured with specific tolerances to account for the relative shrinking and expansion of materials in the heat and cold. Your parts are going to have relatively huge gaps between them in the dead of a North Dakota winter versus at full operating temperatures during a heat wave in Las Vegas. If these tolerances didn't exist, they'd expand and make contact in the heat or have such extreme gaps in the cold they could lose all contact.

Fluids adhere to similar laws. Your transmission fluid has very different viscosity at full operating temperature than when the transmission is cold, which is why the TR6060 is a notchbox upon cold start in the winter and smooth at operating temps.

The clanking you're referencing should go away once the vehicle is at operating temperature. If not, you may want to work on your clutch technique.

[ChrisBlair]

Two piece driveshaft to my mind is not helping matters. My opinion is that if you de-clutch when the trans is "loaded up", it's gonna dump and clunk. nature of the beast.

Imagine it's 1965 and you just bought a GT350. The rear end howls and cracks and pops. Must be broken!?!?! Nawp. That's just what the design sounds like. Customers were convinced the rear ends were failing though.

[White_SS/RS]

The clutch disc has springs that absorb drive train shock. Pic attached. Basically its the springs absorbing load and then releasing. It's in the design and won't hurt anything, however it's quite annoying.

[shibbs]

Driveline slop. Completely normal. You'll learn to drive smoother and it'll lessen a lot.

The powertrain on these cars is pretty.... unrefined by modern standards. There's a reason it says to engine brake in the owner's manual. Something to the effect of only releasing the clutch pedal just before coming to a complete stop.

[Homeless Man]

Originally Posted by gajagfan

I do think that a main result of the this is lugging the engine. Keeping the RPM's up should help with this, at least it seems it does with our car.

Yea keep the RPMs up while parking lol

[Homeless Man]

Originally Posted by vinman

I can't hear shit over the sweet sound of the npp

More like the sweet sound of headers and no mufflers for me

[gajagfan]

Originally Posted by Homeless Man

Yea keep the RPMs up while parking lol

What I meant was not lugging the engine you nut. If you're going slow and not needing to send power through the drive train, clutch it. Hey, get a home! Ha!

[Bizaro]

Welcome to the joys of a 1le tranny

[Wolvie70]

Originally Posted by 1LEdabeast1LE

How can that be normal? 6 years, and no one has figured out a way to fix it? I can only turn the radio up so loud, haha

Get rid of the car.

[Blackchevyroarin]

It doesn't happen if you don't try to slam your foot through the firewall. Solved the problem for me at least.

[CruzinQueen]

Yep. What everyone else says. It's normal. I called the dealer to question it when I first bought the car and he told me to keep the revs up. It sure helps. You get used to it.

[backeddy]

GMCS favorite 2 words "normal" and "abused"

[TIREKLR]

Originally Posted by vinman

I can't hear shit over the sweet sound of the npp