2010 Sierra 4x4 z71 Tcase & Rear Diff

[aeterna]

alright, Ive got a 2010 Sierra 4x4 z71 Crew Cab.

 

 

1. ive been doing a lot of searching for what type of Tcase Fluid we need, and am getting mixed results. some say Dexron vi and others say you can only get it from the dealership its autotrac II something or another. the fluid inside looked to have a red hint to it so im worried it may be the wrong kind, as my understanding is the autotrac II is supposed to be Blue?

 

can anyone shine some light on this for me? do we all have NVG-246 Transfer Cases? i cant see any kind of model# on the tcase just maybe serial numbers.

 

 

2. the rear diff seems to be a tad low (its not all the way to the fill hole) maybe this is normal. but if not I would like to replace the seal and fluid. do I use 70-90 gear oil for this? and does that go into the front diff too?

 

 

 

 

 

Bonus question: did some of our trucks come with 6l90's? i remember seeing something about an HD tow package in the paperwork and am wondering if that is the difference? how can I check, are the 6l80 and 90 visually different?

[MS3DALE]

1. You use DexronVI in the transfer case (AutoTrac was used in the previous gen trucks)

 

2. It is suppose to be a little below the fill hole, you would use 70W-90 synthetic axle fluid for both the front and rear axles.

 

If you check your owners manual it should specify all needed fluids (although it might specify conventional fluid for the front axle, this has since been changed, and GM now specifies synthetic)

 

3. The 1/2-tons have the 6L80 6-speed transmissions (The HD trucks use the 6L90)

[aeterna]

I checked the manual, i may of missed it but it didnt say jack for the diffs. And the tcase only specified volume of fluid but didn't specify a type.

 

Thanks for your help, this dexron vi, is it red in color?

 

 

Lastly, the HD trucks as in 2500hd or did they also make HD versions of the 1500 in 2010?

[MS3DALE]

Dexron will be Red.

HD as in 2500HD and 3500,they didn't make a 1500HD in the GMT900 series trucks.

 

Heres the excerpt from the owners manual which should help you out for future reference....

 

Recommended Fluids and Lubricants

 

This maintenance section applies to vehicles with a gasoline engine. If the vehicle has a diesel engine and/or an Allison Transmission, see the maintenance schedule section in the DURAMAX® Diesel manual.

 

Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.

 

Usage

Fluid/Lubricant

 

Engine Oil

Engine oil which meets GM Standard GM6094M and displays the American Petroleum Institute Certified for Gasoline Engines starburst symbol. To determine the proper viscosity for your vehicle's engine, see Engine Oil.

 

Engine Coolant

50/50 mixture of clean, drinkable water and use only DEX-COOL® coolant. See Engine Coolant.

 

Hydraulic Brake System

DOT 3 Hydraulic Brake Fluid (GM Part No. U.S. 12377967, in Canada 89021320).

 

Windshield Washer

Optikleen® Washer Solvent.

 

Power Steering System

GM Power Steering Fluid (GM Part No. U.S. 89021184, in Canada 89021186).

 

Automatic Transmission

DEXRON®-VI Automatic Transmission Fluid.

 

Key Lock Cylinders

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

 

Floor Shift Linkage

Lubriplate Lubricant Aerosol (GM Part No. U.S. 12346293, in Canada 992723) or lubricant meeting requirements of NLGI #2 Category LB or GC-LB.

 

Chassis Lubrication

Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB.

 

Front Axle (1500, 2500 HD, and 3500 HD Series)

SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 89021677, in Canada 89021678).

 

Rear Axle

SAE 75W-90 Synthetic Axle Lubricant (GM Part No. U.S. 89021677, in Canada 89021678).

 

Transfer Case (Four-Wheel Drive)

DEXRON®-VI Automatic Transmission Fluid.

 

Front Axle Propshaft Spline or One-Piece Propshaft Spline (Two-Wheel Drive with 4-Speed Auto. Trans.)

Spline Lubricant, Special Lubricant (GM Part No. U.S. 12345879, in Canada 10953511).

 

Rear Driveline Center Spline

Chassis Lubricant (GM Part No. U.S. 12377985, in Canada 88901242) or lubricant meeting requirements of NLGI #2, Category LB or GC-LB.

 

Hood Hinges

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

 

Body Door Hinge Pins, Tailgate Hinge and Linkage, Folding Seats, and Fuel Door Hinge

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

 

Tailgate Handle Pivot Points, Hinges, Latch Bolt, and Linkage

Multi-Purpose Lubricant, Superlube (GM Part No. U.S. 12346241, in Canada 10953474).

 

Weatherstrip Conditioning

Weatherstrip Lubricant (GM Part No. U.S. 3634770, in Canada 10953518) or Dielectric Silicone Grease (GM Part No. U.S. 12345579, in Canada 992887).

 

Weatherstrip Squeaks

Synthetic Grease with Teflon, Superlube (GM Part No. U.S. 12371287, in Canada 10953437).

[aeterna]

Holy hell thanks man, i was definitely looking in the wrong section.

 

If your still willing to answer questions ive got one more for yah.

 

Ive got new transmission in the truck, its been in for 10k miles. The place that installed it put some tranny fluid in that is the typical pink color. Do you know of an alternative to dexron VI that is pink in color?

[MS3DALE]

Dexron will be a Red or Pink/Pinkish color, it just depends on how your looking at it (IE-what background you have it on...dipstick,rag,countertop,etc.)

[aeterna]

Ah I see, thanks.