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newdude

2020+ T1 Chevrolet/GMC HD Quick Reference Guide

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Hope nobody minds, but I'm going to start up a Quick Reference Guide for common parts/fluids/bulbs for the T1 HD trucks.  I'll try to keep it updated if anything changes.  If a mod wants to sticky it, I'm down for that too. 

 

Owners Manuals

Oil Changes

 

6.6 gas L8T (VIN code "7")

  • Capacity: 8 Quarts
  • AC Delco Oil Filter: PF63E / 19383806
  • Drain Plug Size: 12X1.75X18.15

6.6 Diesel L5P (VIN code "Y")

  • Capacity: 10 Quarts
  • AC Delco Oil Filter: PF26 / 89017527
  • Drain Plug Size: 12X1.75X18.15             

Engine Air Filters

  • 6.6 Gas: A3244C / 84121219
  • 6.6 Diesel: A3248C / 84554703

Engine Fuel Filter

  • 6.6 Diesel L5P: TP1015 / 23304096

Interior Filters

  • Passenger Compartment Air Filter: CF185 / 13508023

Wiper Blades

  • Drivers & Passenger Sides: 23387857

Spark Plugs

  • 6.6 Gas L8T: 41-114 / 12622441

Glow Plugs

  • 6.6 Diesel L5P: 68G / 12690238

Fuel Tank Sizes

  • 6.6 Gas L8T, All Box/Cab Configurations: 36 Gallons
  • 6.6 Diesel L5P Double Cab Long Box/Crew Cab Standard and Long Box Configurations: 36 Gallons.  
  • 6.6 Diesel L5P Double Cab Standard Box Configuration: 29 Gallons.
  • 6.6 Diesel L5P Regular Cab Long Box Configuration: 28 Gallons.

Diesel Exhaust Fluid

  • Tank Capacity: 7 gallons

Automatic Transmission Fluid

  • 6L90 6 Speed MYD (Gas engine): DEXRON-VI Automatic Transmission Fluid
  • 10L1000 10 Speed MGM/MGU (Diesel engine): DEXRON ULV Automatic Transmission Fluid.

Transmission Capacities (Approximate):

 

6L90 6 Speed MYD (Gas engine)

  • Pan Drop: 6.0 quarts
  • Overhaul: 10.5 quarts
  • Complete System: 12.4 quarts

10L1000 10 Speed MGM/MGU (Diesel engine)

  • Overhual: 20.6 quarts
  • Complete System: 22.08 quarts

Transfer Case Fluid

  • Electronic Shift Non-Autotrac MP 1625/1626–NQF: Dexron VI
  • Electronic Shift Autotrac MP 3025–NQH: Dexron VI

Transfer Case Fluid Capacities

  • Electronic Shift Non-Autotrac MP 1625/1626–NQF: 2.4 Quarts
  • Electronic Shift Autotrac MP 3025–NQH: 1.6 Quarts

Brake System

  • Hydraulic Brake System (Vehicles with DOT 3 brake fluid): DOT 3 Hydraulic Brake Fluid
  • Hydraulic Brake System (Vehicles with DOT 4 brake fluid): DOT 4 Hydraulic Brake Fluid

Wheel Lug Nut Torque

  • All Models: 140 lb-ft / 190 N-m

Front Axle 9.25"

  • Axle Lubricant: 75w85 Synthetic High Efficiency Lubricant, 10-4091 / 19300457
  • Capacity: 1.9 Quarts

Rear Axle 11.5"

  • Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401
  • Capacity: 3.17 Quarts

Rear Axle 12.0"

  • Axle Lubricant:75w90 Synthetic Lubricant, 10-4016 / 88900401
  • Capacity: 3.17 Quarts
Edited by newdude
  • Like 9
  • Thanks 1

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Lighting Systems - Chevrolet

 

Halogen Headlamps (WT/Custom/LT)

  • Low Beam: H11
  • High Beam: 9005
  • Marker/Turn Signal: 7444NA

LED Headlamps (LTZ/High Country)

  • Low Beam: LED (part of lamp assembly)
  • High Beam: LED (part of lamp assembly)
  • Marker/Turn Signal: 7444NA

Fog Lamps: LED assembly

 

Tail Lamps - Incandescent

  • Stop/Turn: 7444LL
  • Marker: 194
  • Backup: W16W

Tail Lamps - LED

  • Stop/Turn: LED (part of lamp assembly)
  • Marker: LED (part of lamp assembly)
  • Backup: W16W

License Plate Lamp: 194

 

CHMSL: LED assembly

 

Lighting Systems - GMC

 

LED Headlamps (Base/SLE)

  • Low Beam: LED (part of lamp assembly)
  • High Beam: LED (part of lamp assembly)
  • Marker/Turn Signal: 7444NA

LED Headlamps (SLT/AT4/Denali)

  • Low Beam: LED (part of lamp assembly)
  • High Beam: LED (part of lamp assembly)
  • Marker/Turn Signal: LED (part of lamp assembly)

Fog Lamps: LED assembly

 

Tail Lamps - Incandescent

  • Stop/Turn: 7444LL
  • Backup: W16W

Tail Lamps - LED

  • Stop/Turn: LED (part of lamp assembly)
  • Marker: LED (part of lamp assembly)
  • Backup: LED (part of lamp assembly)

License Plate Lamp: 194

 

CHMSL: LED assembly

 

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31 minutes ago, BB&Chiveon said:

crew cab l5p standard is 36 gal fuel tank

 

Order guide does indicate 36 gallon for diesel CCSB, CCLB and DCLB, but all print information like the owners manual and GM service info don't show a 36 gallon tank with diesel engine.  I see you have a 2020HD, can you confirm the 36gal with a diesel? 

 

EDIT:  And now to make things more interesting, the 2020 upfitter manual shows all cabs and engines getting a 36 gallon tank.  So that's 3 different sources from GM that all have a varying fuel tank capacity/cab relation on the diesel engine. 

Edited by newdude

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I can not believe that the diesel tanks are 28 gallons for a long bed dually? wow why not the larger tank? I guess those aftermarket tank companies will be making some money.

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Both my 2013 and 2016 standard bed Crew Cab with Duramax  came with 36 gal tank, so did my '19 DRW Crew Cab with long bed and Duramax.  I seriously doubt GM is going backwards on this.  

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Ok I just went thru the GM ordering guide and looked for fuel tanks. There are "3" yes three tanks options available to order. CODE N2L is for 40 GALLON rear tank, Then there is CODE N2M IS FOR 23.5 GALLON AND THERE IS A CODE N2N FOR A DUAL TANK SET UP FRONT AND REAR TOTAL OF 63 GALLONS. So now that clears everything up. Don't everyone rush to the dealers and order dual tanks. I got this from the "GM RPO Codes" They are available for both the regular and crew cabs and per note "1-Equipment Group 1SA available on all models"

 

   https://www.gmfleetorderguide.com/NASApp/domestic/proddesc.jsp?year=2020&butID=1&regionID=1&divisionID=1&vehicleID=21694&type=0

 

Chuck

Edited by Gecko50

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On 9/17/2019 at 6:15 AM, Irish80 said:

Can confirm my truck has a 36 gallon tank.

Same with my 2500 AT4 Diesel. 

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On 9/13/2019 at 11:23 AM, Gecko50 said:

Ok I just went thru the GM ordering guide and looked for fuel tanks. There are "3" yes three tanks options available to order. CODE N2L is for 40 GALLON rear tank, Then there is CODE N2M IS FOR 23.5 GALLON AND THERE IS A CODE N2N FOR A DUAL TANK SET UP FRONT AND REAR TOTAL OF 63 GALLONS. So now that clears everything up. Don't everyone rush to the dealers and order dual tanks. I got this from the "GM RPO Codes" They are available for both the regular and crew cabs and per note "1-Equipment Group 1SA available on all models"

 

   https://www.gmfleetorderguide.com/NASApp/domestic/proddesc.jsp?year=2020&butID=1&regionID=1&divisionID=1&vehicleID=21694&type=0

 

Chuck

 

This information applies to 3500 HD CHASSIS CAB ONLY.  It is NOT applicable to 2500hd and 3500hd regular pickup trucks.  All the info at the top of the page is for regular pickup as well, although most of the info does interchange with chassis cab.      

Edited by newdude

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Update 10/2/19.  I've revised the fuel tank section.  There are just two mysteries on the diesel, the double cab standard box (29gal) and regular cab long box (28gal).  Both really have yet to hit lots so I'm still unsure if these are for real or not, but GM's documentation states this to be the case.

 

   

 

 

Edited by newdude

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18 hours ago, newdude said:

 

This information applies to 3500 HD CHASSIS CAB ONLY.  It is NOT applicable to 2500hd and 3500hd regular pickup trucks.  All the info at the top of the page is for regular pickup as well, although most of the info does interchange with chassis cab.      

I could only wish they would offer dual tanks. I stand corrected as you sir are correct. I guees the aftermarket tank builders get more sales.

 

Chuck

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Mobil 1 oil filter # is  M1-210A.   they went to metric threads now so old filters dont work 

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On 10/2/2019 at 5:58 PM, newdude said:

Update 10/2/19.  I've revised the fuel tank section.  There are just two mysteries on the diesel, the double cab standard box (29gal) and regular cab long box (28gal).  Both really have yet to hit lots so I'm still unsure if these are for real or not, but GM's documentation states this to be the case.

 

   

 

 

AND, in the 2020 sierra owners manual:

 

2500 Series and 3500 Series Standard Box (Except Double Cab Diesel) 136.3 L 36.0 gal

and

2500 Series and 3500 Series Long Box (Except Regular Cab Diesel) 136.3 L 28.0 gal 

 

To save everyone getting out the calculator 136.3 L is same as 36.0 us gal   (not 28 gal)

 

Regardless, assuming they are both 136L and the 28.0 is a actually a typo,  that still leaves leaves double cab std box with 111 L /29.4 gal  

and the reg cab long box, with a 106 L / 28 gal. 

 

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