Jump to content

Clack Noise Upon Shift...Allison

agraves138

By agraves138
in Troubleshooting & Recalls

 Share

Recommended Posts

agraves138 Enthusiast

agraves138

Posted
Posted

Good evening all, 

 

2016 Silverado 2500HD 6.6L Allison Trans. 59K miles

 

For a while I've noticed that sometimes (not always) there is a noise that can be heard from inside the cab when the transmission shifts gears. Best way I can describe it is a "clank or tick" type noise. I generally happens when the truck is either under load such as going up an incline, or if I accelerate a bit harder than normal, usually I'll notice in the 2-3 shift, but somethings also in the 1-2 shift. 

 

The transmission doesn't shift late, or even hard, but it makes this audible noise, and it can even be slightly felt through the truck when it does occur. 

 

In hoping to solve the issue:

I recently had the dealer perform a transmission service (fluid, inner and external filter). Noise still present.

I recently changed the front differential fluid. Noise still present.

I recently changed the rear differential fluid. Noise still present. 

Next up I'll be doing the transfer case fluid. 

 

Checked the U-joints, and I don't seem to find play or excessive play in the shafts/joints. May a tiny bit in the front drive shaft where it comes out of the transfer case, but even that seems minimal. 

 

Is anyone else experiencing this? Is this normal for the Allison/Duramax? This is my first diesel, so maybe it's just something I'm not used to. But if it is an issue I'd like to fix it early. Thanks! - Ant

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      That one looks decent for the price   BUT..I want something that also supports OBDI/1.5. A lot of the prosumer-grade scanners don't have legacy support in order to keep costs low. I believe the Autel does if you go higher end with them.   For fun, I reached out to a local Snap-On rep because I was interested in the 2600. $1895 MSRP, says he can do $1595. That's still a lot, but then again, that's not a horrible discount for just asking out of the blue. Could probably do better if I was a regular buying off his truck, but I'm not.   Not sure if I mentioned but I didn't realize with USED scanners from Snap On that you need to make sure a) the serial number isn't flagged as stolen. On the newer ones, SnapOn can remotely disable the device if it's flagged in their system. And, customer service can tell you if it is, if you're thinking about buying used. B) Make sure it's paid off. If the seller still owes money to the truck or if they financed through Snap On, the device can be remotely disabled until the balance is paid. It's less clear if SnapOn will tell you if a balance is still owed; I didn't make it that far with the used model I was considering. I did read that SnapOn has no way of tracking any "truck financing" deals between the SnapOn rep and buyer, only if they financed through corporate. So there's that extra caution needed.   Still waffling on whether I go with a ~$500ish Autel/TopDon or spend bigger money. The value seems to be in the prosumer brands. I'm not giving them enough credit TBH, actual production repair shops use them daily BUT I'm still allergic to certain kinds of underdog products trying to unseat American companies with solid reputations. SnapOn's scanner isn't wholly made in the US, but it is assembled here and they have US support and probably the most proven/ robust legacy support.   Something to think about. Value, or principles? There's a $1k difference.
    • Atlas
      Winter Returned

      By Atlas · Posted

      I'm thankful to live where we don't have extreme weather. We might all be blown to smithereens when Mt. Rainier goes, but 80 is warm enough in the summer and I can generally count the number of hard freezes in the winter on one hand. The cars here don't rust and they don't get sun-baked, either.   We have finished off many of our average 52 days of "clear/sunny" weather, though. Sunsets are coming earlier, the nights are a little cooler. It's right around the first week of September when we get our first warning that summer is coming to a close with overcast skies and the start of "hoodie weather" temperatures during the cooler parts of the day. By October, it's usually time to ditch the shorts. By November, it's mostly raining.
    • JimCost2014
      Towing In Loose Gravel

      By JimCost2014 · Posted

      My point was: If what you are doing works, keep doing it:   But, I will have a talk with AI to make sure their info is more accurate going forward.
    • Reyben
      LP5 ECM For sale

      By Reyben · Posted

      Hello There I have a brand-new engine control module (ECM/PCM) for the Duramax 6.6 liter diesel engine. GM E41 ECM on 2017–2023 6.6L Duramax L5P trucks Bought it for a project last year and end selling the truck, so i never get to use this ECM LP5/E41 I paid $1499 willing to sell it for $1200 OBO  
    • Grumpy Bear
      Post your UOA, (used oil analysis) here

      By Grumpy Bear · Posted

      @OnTheReel , What oil was used for this sample? 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...