Jump to content

Regearing Trailboss

Blake Stiff
 Share

Recommended Posts

Blake Stiff New Member

Blake Stiff

Posted
Posted (edited)

So after some looking around it appears there aren’t any aftermarket front gear sets for the new silverados? I have 19 trailboss lt that I just put 295/70R18 on and it feels completely gutless now. I wanted to change the gearing to something like 4.10s, does anyone know if there is anything available for these trucks?

 

If gears aren’t available does anyone have any experience with any of the tuners out there helping?

Edited by Blake Stiff
flattop Enthusiast

flattop

Posted
Posted

The 3.0 diesels offer 3:72 gears with the Max Tow package, so those should be available for your trail boss? You probably have the standard 3:23's currently and those with taller/heavy tires probably are not to snappy.

 

Tuning the 3:73's is something that has to be addressed to accommodate the transmission and other rpm based functions of the ECU. Not sure if anyone has accomplished this yet?

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

His 2019 truck can be tuned with HP Tuners, pretty sure it can change the gear ratio in the calibration.

 

It's a spendy thing to do for tuning though.

Gangly Senior Enthusiast

Gangly

Posted
Posted (edited)

This is almost silly. 

 

If you have stock gear ratios then you have 3.23's.  By going with a 295/70/18 tire, you increased marginally to a 34.26" diameter tire which would only require a 3.35 ( an extremely small change of .12) gear swap to be back to stock performance.  If the performance of your vehicle dropped as significantly as you say above because of a 1.26" increase in tire diameter, then you need to get your vehicle checked out for engine issues or you bought some really crappy/heavy wheels and tires. 

 

Then again, there is also the potential for a slight exaggeration here in performance degradation...maybe?

 

To answer your question, there are very limited available options for front and rear gear-set swaps on the T1 platform.  As they become older and cheaper to find, people will start modifying them more heavily and the aftermarket will fill in the voids where needed.  Give it time, various sized gear sets will become prevalent in the future, just not sure how distant.

Edited by Gangly
Blake Stiff New Member

Blake Stiff

Posted
  • Author
Posted

Gutless is an exaggeration I’ll admit. I guess my biggest issue right now is when in sand or softer dirt it doesn’t have the get up and go I would like. The taller/wider tires do help with that some in the sand but I really have to get the rpm’s up pretty high to get that same speed. 
 

I had looked at the hp flashpaq but being in California it seems like that’s a no go for the time being. I’m just trying to figure out a way to get more power with the bigger tires. Also I’m running falken at3 on method 305s. So there is a substantial weight difference there as well. I just thought maybe regearing would be simpler than it apparently it is. 
 

I appreciate the responses. 

Nestor Romero Enthusiast

Nestor Romero

Posted
Posted
On 1/3/2023 at 9:36 AM, Gangly said:

This is almost silly. 

 

If you have stock gear ratios then you have 3.23's.  By going with a 295/70/18 tire, you increased marginally to a 34.26" diameter tire which would only require a 3.35 ( an extremely small change of .12) gear swap to be back to stock performance.  If the performance of your vehicle dropped as significantly as you say above because of a 1.26" increase in tire diameter, then you need to get your vehicle checked out for engine issues or you bought some really crappy/heavy wheels and tires. 

 

Then again, there is also the potential for a slight exaggeration here in performance degradation...maybe?

 

To answer your question, there are very limited available options for front and rear gear-set swaps on the T1 platform.  As they become older and cheaper to find, people will start modifying them more heavily and the aftermarket will fill in the voids where needed.  Give it time, various sized gear sets will become prevalent in the future, just not sure how distant.

I actually have the 3.42 stock gear (trail boss)

 

I haven’t upgraded tires yet, was doing research to make sure this would not be an issue, given your explanation it makes sense.

 

 Thank you for taking the time to reply with a thorough explanation, it helps a lot.

Gangly Senior Enthusiast

Gangly

Posted
Posted
20 hours ago, Nestor Romero said:

I actually have the 3.42 stock gear (trail boss)

 

I haven’t upgraded tires yet, was doing research to make sure this would not be an issue, given your explanation it makes sense.

 

 Thank you for taking the time to reply with a thorough explanation, it helps a lot.

Are you certain that you have 3.42's on your TB?

 

I know in the past you could get the 3.42's in a Custom trim truck with the smaller 6 speed transmission, but I'm pretty sure the only way to get the 3.42 9.76" axle with the 8 or 10 speed is to get the max trailering PKG, and that is not available with the TB or AT4 last I checked.   

Do you have a window sticker or build sheet?  Yours would be the first TB I have seen or heard of with the 3.42's if that's the case.

  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted (edited)
6 hours ago, Nestor Romero said:

Yes here is the window sticker 

window-sticker.pdf 247.41 kB · 6 downloads

 

 

On the 2.7T the only gearing is the 3.42, Trail Boss or not.

 

If its a V8 Trail Boss its 3.23 on the 8 and 10 speeds.  If its 3.42 on a Trail Boss it would have only been on the Custom Trail Boss with the 6 speed and the 4.3 or the 5.3 AFM engine which would have been 2019-2021.  

Edited by newdude
newdude Senior Enthusiast

newdude

Posted
Posted

ersion

On 1/5/2023 at 5:04 PM, Gangly said:

Are you certain that you have 3.42's on your TB?

 

I know in the past you could get the 3.42's in a Custom trim truck with the smaller 6 speed transmission, but I'm pretty sure the only way to get the 3.42 9.76" axle with the 8 or 10 speed is to get the max trailering PKG, and that is not available with the TB or AT4 last I checked.   

Do you have a window sticker or build sheet?  Yours would be the first TB I have seen or heard of with the 3.42's if that's the case.

 

 

Assuming you haven't hit his window sticker yet, 2.7T gets the 3.42.

 

The only Trail Boss otherwise that would have 3.42 would have been the Custom trim with the 4.3/6 speed or the 5.3/6 speed, 2019-2021.

  • 2 weeks later...
htex88 New Member

htex88

Posted
Posted
On 1/3/2023 at 8:38 AM, Gangly said:

image.thumb.png.024b15fe88662ba04f39f9a97b49f3b3.png

 

 

would this be the same for 275/65-20 tires? 

Gangly Senior Enthusiast

Gangly

Posted
Posted

You would need to go from a 3.23 rear gear to a 3.33 rear gear which would be so small of a change that it might as well be non existent.  If staying with the same load range tire, going to a 275/65-20 would feel no different and there would be no need to change gearing.

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

    • newdude
      2027 GMC Sierra: Official Discussion

      By newdude · Posted

      Follows the motif on the Sierra EV.  Satin finsh to the lower bumper area, painted above:   Elevation       Denali      
    • taze
      I love my truck but

      By taze · Posted

      Not exactly what I was hoping for, but I do like it. I wonder if they'll bring back Smokey Quartz Metallic? 🤔 https://gmauthority.com/blog/2026/06/here-is-the-all-new-2027-gmc-sierra-1500/
    • tjonesdfw
      2027 GMC Sierra: Official Discussion

      By tjonesdfw · Posted

      Whoever greenlighted the work truck matte black front bumpers on every trim but the AT4X should be fired!  I was hoping that was an AI mistake, but just realized they were on every model of the 2027 Silverado too.     Some parts of the interior do look premium, but the Denali Ultimate dashboard looks like an afterthought.  At least they appear to have lost the microfiber the high end Silverado models showed, but the '27 High Country dash looks better than the Denali.  
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      New member here. I am researching a read-first event-recorder concept for late-model GM V8 trucks. This is not a sales post. There is no product link, price, preorder, or mailing list. I am trying to determine whether the underlying problem is real before building anything.   Has your truck ever had a brief problem such as: - rough running or a momentary misfire - an oil-pressure warning or unusual pressure event - reduced power or a brief stall - a U-code or lost-communication problem - a symptom that disappeared before the dealer or independent shop could reproduce it   If so, I would appreciate the following details: - year, model, engine, and mileage - what happened and under what conditions - whether a DTC and useful freeze-frame data were stored - whether the shop was able to reproduce it - what the eventual confirmed repair was, if known - what additional information would have helped the diagnosis   The concept being evaluated is a removable leave-in recorder that continuously retains a rolling window from before and after an event. It would not tune, reflash, clear codes, or change the vehicle calibration.   I am also not claiming that it could predict lifter failure or see every internal ECM variable.   The real question is whether continuous event history would add enough useful evidence beyond freeze frame, GDS2, and existing scan tools — or whether it would simply be another unnecessary gadget.   For owners and technicians, which problem would make something like this genuinely useful: 1. intermittent misfire or AFM/DFM-related behavior 2. oil-pressure events 3. lost communication or electrical faults 4. none of the above Please be blunt. Negative feedback is just as useful as positive feedback.
    • Atlas
      2027 GMC Sierra: Official Discussion

      By Atlas · Posted

      No tears over the SLE and SLT trim levels disappearing but I kind of loathe the "Elevation" name. It's a truck--skip the elegance.   The slab-dashboard design is decidedly different. Almost has a Hummer flavor to it. "Professional Grade" seems to be leaning very white-collar, tech-driven these days moreso than blue-collar, functional design.   The Silverado would be my choice between the two new trucks. Pleased with the engine lineup in both. The GMC is a little "too much" for a truck, IMO, and the Denali borders on ridiculous - but I do know there are buyers for luxury trucks out there. It's just not my speed.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...