Jump to content

Annoyed

bigdeer1

By bigdeer1
in Troubleshooting & Recalls

Recommended Posts

MikeNH Senior Enthusiast

MikeNH

Posted
Posted
M4 m5? Are u referring to manual shifting?

 

Not exactly. The M mode just locks out gears above your selection. M4 only uses gears 1-4, etc. You don't have to shift anything. It keeps RPM where it belongs IMO. With 3.42s I usually use M4 up to 40 or 45 and M5 up to 50-55 or so.

  • Replies 87
  • Created
  • Last Reply
LTZ2014 Enthusiast

LTZ2014

Posted
Posted
It was never noticeable before the exhaust... But after it just seems like the truck is gutless now... + you can not only feel the truck shifting but now u can hear it struggle... Honestly.. Ever since the exhaust being changed the truck drives like crap

Thank you for being honest. I'll be sticking to stock for now.

 

 

Sent from my iPhone 5 using Tapatalk

bigdeer1 Enthusiast

bigdeer1

Posted
  • Author
Posted

What exhaust did you put on?

Flowmaster 40 dual in dual out... I removed all the existing pipe that came stock on the truck... No valve anymore or resonator Just cats and mufflers

Ljrussell94 Enthusiast

Ljrussell94

Posted
Posted

And i know what you mean about how it struggles to find the right gear and keeps shifting when it doesnt need to be. Every 6 speed gm ive driven since theyve came out in these suvs and trucks do that. I hate it, but my last truck blackbear tune fixed it perfect. It was night and day difference. My 2010 was alot worse than this 14 though

bigdeer1 Enthusiast

bigdeer1

Posted
  • Author
Posted

And i know what you mean about how it struggles to find the right gear and keeps shifting when it doesnt need to be. Every 6 speed gm ive driven since theyve came out in these suvs and trucks do that. I hate it, but my last truck blackbear tune fixed it perfect. It was night and day difference. My 2010 was alot worse than this 14 though

We'll I'm glad to hear I'm not the only one but not glad because it just down right sucks for me and everyone else experiencing it... If this truck had the older 4 speed trans I would enjoy it much more I think..

Ljrussell94 Enthusiast

Ljrussell94

Posted
Posted

 

Flowmaster 40 dual in dual out... I removed all the existing pipe that came stock on the truck... No valve anymore or resonator Just cats and mufflers

On my 2010. I had flowmaster 44s and for some reason it felt like it downshifted alot more than stock. I then switched to borla and that went away. Still shifted like a stock 6 speed but the borla i felt made it run and shift alot better than the flowmaster. I then got a blackbear tune and it was a completely different truck.

4cRanch Enthusiast

4cRanch

Posted
Posted

Any chance you kept the parts that were cut off or maybe they still have them and haven't hauled their scrap parts? Seems the easiest solution is to reverse what you did and the problem is solved, sans the $, but again no drone or shift concerns. Keep us posted.


anthony2558 Enthusiast

anthony2558

Posted
Posted

Just curious how long have you had the exhaust on the truck, and how long after that did you notice the weird shifting. It could be that the computer is confused, and is trying to relearn its shifting pattern taking into the account of possible loss of back pressure. I've always done this rule of thumb... When ever adding a performance part to a vehicle I disconnect the battery for an extended period of time. Or disconnect the positive and ground it on something (not the negative terminal tho) it drains the memory on the ECU/PCM and the truck will relearn from a fresh start.

 

Tapatalk via Moto X

 

bigdeer1 Enthusiast

bigdeer1

Posted
  • Author
Posted

On my 2010. I had flowmaster 44s and for some reason it felt like it downshifted alot more than stock. I then switched to borla and that went away. Still shifted like a stock 6 speed but the borla i felt made it run and shift alot better than the flowmaster. I then got a blackbear tune and it was a completely different truck.

I just can't understand how an exhaust can make that big of impact on how the truck runs.. It feels like a completely different truck.. Flowmaster isn't some cheap knock off brand.. There products have been around for years. I don't see the muffler causing that much of a change to make the truck run as it does today.

 

It seems to have lost power... Is it because of the muffler? Idk... Maybe I never noticed before because u couldn't hear the truck before but it sure seems like the power took a hit after the flow master...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Deadwood
      10L1000 anyone with High Mileage ? I hate Damocles....

      By Deadwood · Posted

      New member here, very long time occasional guest. Saw this thread, thought it would be a good time to contribute someting. It is only my experience and not a claim that everyone will have the same.   I bought my '20 3500 L5P new and have put 99.9% (literally) of it's current ~400k miles on it myself, with over 50% of that towing loads between 4k to 15k, and to me this truck has been nothing short of amazing. For the first 235k I had zero issues, and from there until 321k I replaced a NOx sensor, two failing glow plugs, and three of the notorious injector connectors. I believe this truck is in part, a testament to good luck, but also good care and following a decent maintenance schedule (I also keep meticulous records.) As a result, it looks as good as a well cared for 70k rig, up and down, inside and out.   At some point before that 321k mile mark I began to get a little spooked about the 10L1000, especially the valve body. Word of mouth about potential issues prompted me to jump on the net to sift through all the noise and determine what all the fuss was about. I routinely take long trips, coast-to-coast and points in between, so roadside breakdowns can be '...a thousand miles from nowhere' and a bit of a challenge, and though I had no issues, my guard was up and activated.   And then I stumbled across a chance to salvage some parts off a new 2025 that had been wrecked in transport. I grabbed a few wear items (alternator, pulleys, etc.) and on a whim asked what the ten speeder would cost me. It was cheap...really cheap. I knew some changes had been made in the '24+ version 10L and were supposedly not compatible, but I called service/parts at my local Chevy dealer and asked why and they didn't know. A call to a well known aftermarket transmission outfit revealed it was very likely it would be fine, but to them not 100% sure.   Because it was cheap (really cheap) and I was spooked, I took the chance. Had it installed by a local shop and it worked like a champ, shifted just like the original. At it's first service at 37k, I had the shop put in a Next Gen valve body kit, which after some initial hiccups and rough shifts, smoothed out though with somewhat firmer shifting.   All that said, I have a very serious concern about my newer transmission as just two weeks ago it suddenly began to exhibit a strong reluctance to engage forward or reverse. It was a bit past due anyway so I took it in for service. The reason it was sticking was due to 'glitter' in the fluid clogging the filter...not good folks, often indicates a converter giving out. We ended up going ahead with the new filter and fluid, first to see if it would move and shift, and then if so buy me a little time. It did, and I've driven it over a thousand miles and it is shifting smooth, no noises or slipping. Regardless, it looks like a third gearbox is in my future so I can resume taking long trips with some confidence. In the very short term, my curiosity will have me examining the fluid to check how much glitter has reappeared.   An earlier poster had alleged, in the context of 10L100 failures, that it is another example of how we seasoned citizens somehow descend into hysteria, lose control of our senses, and react irrationally after brief encounters with the idiocy of the internet infosphere. Let me say (and I have used and abused said internet since it's infancy) there is no segment of the populace that has a corner on over-reaction to digital garbage. Just as my offering of experience in this arena is purely anecdotal and should not be considered gospel or all-encompassing, I believe it is still worthwhile information to consider, along with other relevant anecdotal experiences about things like complex transmissions, especially when balanced with other sources.   So to answer the original question, yes I got high miles out of my first 10L, trouble free for 321,000. Now I really wonder how much longer it would have went. Did I 'overreact' to the internet ghouls by replacing a 'good' one with a 'bad' one? Maybe. Who knows, the thing might have taken a puke a 100 miles later. So I'll just fix it again, then move on and start thinking about all the other stuff that will eventually wear out. It still has the original brakes (they're at ~60%), original injectors/pump, turbo, water pump, etc....pretty much original everything. Knock on wood.
    • swathdiver
      6 Speed vs 8 Speed

      By swathdiver · Posted

      At peak temperature.  They get to cool down and warm up more, especially those with the external cooler.  I have three GMT900s and one of them has over 225K on its original transmission.  Fluid gets changed about every 36K miles, all of it.     It's not the bean counters, it was the government.  They had to meet CAFE standards and other government requirements.   To get around that, we tune them and modify them to our liking.
    • GMCustomerService
      Will not stay in Reverse

      By GMCustomerService · Posted

      Our customers' safety isn't something we take lightly. To ensure you get the proper assistance for your truck's repairs, please fill out the form at https://s.chevy.com/support-request with all pertinent details including your username.
    • GMCustomerService
      2026 Z71 Forward and Rear Park Assist help

      By GMCustomerService · Posted

      We appreciate you sharing your experience with your truck. To ensure we get you the proper assistance, please fill out the form at https://s.chevy.com/support-request with all pertinent details including your username.
    • newdude
      Radio Update

      By newdude · Posted

      PCM?  These don't have a "PCM".  Powertrain Control Module.  They have an ECM (Engine Control Module) and TCM (Transmission Control Module).   Do you mean update the radio?     You can check what version you have in the settings page.  Should be Y181 but there might be a newer build they can update it to.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...