Jump to content

Re-gear and Detroit Locker in a 2017 2500HD 6 Liter

SierraHD17

By SierraHD17
in Modifications & Accessories

Recommended Posts

SierraHD17 Senior Enthusiast

SierraHD17

Posted
Posted

Not a question from me but since the information is so limited on this I will hopefully help someone else along the way.  I am just beginning my parts scouring and gathering so I expect to actually redo the truck in January sometime.  So far this is what I have learned.  My 2017 2500HD uses the same 10.5" 14 bolt AAM ( based off the GM corporate 10.5") that GM has used forever.  The GM parts department confirmed this for me by searching parts between an older truck and my own.  This was my biggest question as nobody has any solid information posted whether it be parts or otherwise if the 2015+ trucks changed at all.  The front is the same 9.25" IFS shared in all 2011 and newer HD trucks so that works very well too. 

 

So lets focus on the front.  I will need gears and bearings only as I am not touching the carrier.  The gear set is common to any GM 9.25" IFS from 1988 and onward and only the bearing set is specific to 2011 and newer but that's it.  

 

For the rear this means any GM corporate 14 bolt parts fit from 1973 and onward.  There was a change with the pinion bearing in the mid 1980's but if you buy the appropriate bearing set for the pinion support you are using then it doesn't matter.  So I went to the boneyard and yanked the open carrier out of a 1994 C2500 454 truck that had a 4.10 geared 10.5" in the back.  This old heap of a donor truck was an open differential which for the purpose of my build I need.  If you simply want to regear your truck and use the existing G80 Gov Lock you don't need to do this...... or if you buy a Trutrac, or a clutch pack limited slip of some kind.  The Detroit however is a lunch box style design and drops in place of the spider gears inside a factory open carrier.  

 

Something else unique to the 10.5" is the carrier split.  What this means is the carrier is physically different depending on axle ratio and in the case of the 10.5" it splits at 4.56.  Anything 4.10 and higher ( ratio, not numeric) uses one carrier and then 4.56 and deeper uses another.  No problem but remember that my carrier came from a 4.10 geared truck.   The aftermarket however makes "thick" gear sets that allow you use a lower gear ratio on the 4.10 and higher geared carriers. 

 

  • Replies 111
  • Created
  • Last Reply
SierraHD17 Senior Enthusiast

SierraHD17

Posted
  • Author
Posted

20171221_182410.thumb.jpg.90120bfec801486c1cc77972b9ae99e7.jpg

 

There is my beauty of an open carrier all nicely cleaned and freed of its old carrier bearings. 

 

Got a bit of deal on the locker too.  Went browsing on Amazon and low and behold there is the Detroit for a 10.5" advertised at $332 shipped!  Now since I don't advertise, I am in Canada and that price is in Canadian dollars.  Most places state side advertise the locker at $450 to $500 USD so this is easily half of that.  Needless to say I clicked the Buy with one click option and got it sent on its way.  Interesting to see what shows up when it gets here haha.  

20171221_190615.thumb.png.50062473551dafdff051662347134ac7.png

crankman Enthusiast

crankman

Posted
Posted

Interesting thing to do to a 2500, have you considered on demand locker such as ARB so it will have good street manners. Then if you get in a bad spot flip the locker on and get thru. 

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

Having ran a Detroit locker in a daily, I personally wouldn't feel a selectable would be a benefit. They don't have that bad of road manners.

I would go the same route...

Steve
2012 2500hd

SierraHD17 Senior Enthusiast

SierraHD17

Posted
  • Author
Posted

Yup.  And I actually enjoy the manners on slippery roads over an open rear end or one that allows one tire fires.  I got used to it and how predictable the truck was so now without I can't stand it.  

SMiller Senior Enthusiast

SMiller

Posted
Posted

What size tires are you going with? Would love to run a 35in. tire and 4.56 gears. Glad to see you are running a real locker, will make for a great setup.

SierraHD17 Senior Enthusiast

SierraHD17

Posted
  • Author
Posted

Right now the truck has 295/60R20s and I easily will clear a 295/65/20 which is basically bang on a 35.  I might go to the 35 once I need rubber again.  My truck currently is 3.73 gears so this jump will be fairly significant and should be almost perfect.  

mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted

Interesting?  I would see this being louder and more counterintuitive than G80 and this is going to be driven on streets, hwy's 98% of time?  To each is own I guess?

SierraHD17 Senior Enthusiast

SierraHD17

Posted
  • Author
Posted

Not even remotely.  Plenty of bad information out there from people that have no clue unfortunately.  I can toss you the keys to my 04,  not tell you it has a locker in the back and you wouldn't even notice.  The G80 is a joke lol.

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted

The only time you notice a locker is in a turn...If you power through, it will chirp/slide the inside tire. I drove one over 100k miles myself...once you learn how they operate, they aren't any more noticeable than an LSD.

Steve
2012 2500hd

sdeeter19555 Senior Enthusiast

sdeeter19555

Posted
Posted
I thought these trucks come with a locking rear diff?


Sent from my iPhone using Tapatalk
Not in the same class...

Detroit is gear on gear...locked until you lift.

G80 is a hybrid, it is essentially a LSD that forces the clutches together so tightly that it won't slip. Lots of little pieces...

The Detroit is bulletproof...

Steve
2012 2500hd

Archived

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

Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      Gas fill door

      By newdude · Posted

      Common failure.  You need to replace the fuel door housing.   The painted cover transfers over to the new housing.  To remove the old one there is 4 spots where you poke the plastic to release it.  
    • newdude
      Gasser Subforum Has Been Quiet - - So, Regenerative Braking and Using L10

      By newdude · Posted

      No such thing as regenerative braking on a pure ICE vehicle.     Regenerative braking is the re-capture of energy from electric motors and stores it in the battery pack.  So hybrids, PHEV and EVs have regenerative braking.     What you are seeing is the charging system changing modes is all.  Its likely entering charge mode for some sort of reason is all.  All of the charging modes will be listed below.   As for L10 vs D.  L10 turns off automatic grade braking.  L10 puts you in control of grade downshifts where in D it will automatically do it based on brake pedal position and other factors.  Otherwise L10 and D drive exactly the same aside from that one aspect.    Battery Sulfation Mode The BCM will enter this mode when the interpreted Generator output voltage is less than 13.2 V for 45 minutes. When this condition exists the BCM will enter Charge Mode for 2–3 minutes. The BCM will then determine which mode to enter depending on voltage requirements.   Charge Mode The BCM will enter Charge Mode when ever one of the following conditions are met:   Windshield wipers are ON for more than 3 s. Climate Control Voltage Boost Mode Request is true, as sensed by the HVAC control module via serial data. High speed cooling fan, rear defogger, and HVAC high speed blower operation can cause the BCM to enter the Charge Mode. The estimated battery temperature is less than 0°C (32°F). Battery State of Charge is less than 80%. Vehicle speed is greater than 145 km/h (90 mph) A current sensor malfunction exists. System voltage is determined to be below 12.56 V When any one of these conditions is met, the system will set targeted generator output voltage to a charging voltage between 13.9–15.5 V, depending on the battery state of charge and estimated battery temperature.   Fuel Economy Mode The BCM will enter Fuel Economy Mode when the estimated battery temperature is at least 0°C (32°F) but less than or equal to 80°C (176°F), the calculated battery current is less than 15 A and greater than −8 A, and the battery state-of-charge is greater than or equal to 80%. Its targeted generator output voltage is the open circuit voltage of the battery and can be between 12.5–13.1 V. When fuel economy mode is active, the generator is not charging, only maintaining open circuit battery voltage. The BCM will exit this mode and enter Charge Mode when any of the conditions described above are present.   Headlamp Mode The BCM will enter Headlamp Mode when ever the head lamps are ON (high or low beams). Voltage will be regulated between 13.9–14.5 V.   Start Up Mode When the engine is started the BCM sets a targeted generator output voltage of 14.5 V for 30 s.   Tow/Haul Mode (if applicable) Pressing the Tow/Haul Mode button located on the center stack, the vehicle system voltage is raised and the remote (non-vehicle) battery will be charged. Having the headlamps on will raise the system voltage and if the Tow/Haul button is applied it will not serve any purpose. The voltage is regulated between 13.9-14.5 V.      
    • jaszr2
      Active Grille Delete

      By jaszr2 · Posted

      Hello from Australia Just sharing that there is now a way to delete the active shutters entirely with just a plug in module. Opens up tons of room to light bars etc.
    • jake111
      Gasser Subforum Has Been Quiet - - So, Regenerative Braking and Using L10

      By jake111 · Posted

      I have an observation and a question... 1) I watch the voltage closely because I have had to dial in the cut-in/cut-out voltages of the battery separator to my camper.  The "smart" charging drives me nuts.  Anyway, I noticed that when coasting for a while, and especially if lightly using the brakes (though not necessary), the voltage goes up from mid/high-13 volts to mid/high-14 volts.  Then it drops back down after stopping or going again.  Consistently!   The only explanation I can come up with is REGENERATIVE BRAKING!  Well, maybe that's a little bit of an exaggeration, but it's certainly free extra battery charging.   2) Driving on mountain roads I will use L and vary the max gear.  Things straighten out and I end up in L10.  Sometimes I leave it there for a while.  Is there any difference between L10 and D?   
    • devonthegreat
      anyone interested in a 2002 Chevy Silverado 4x4 parts truck NYC

      By devonthegreat · Posted

      **SOLD** Please end or delete post. thank you

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...