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Discussion Starter · #1 ·
Hey guys.

Just have a couple questions regarding my trucks transfer case. I have a 2004 Silverado automatic transmission. 4.8L engine. It has the manual 4x4 on the floor.

What transmission do I have? the 4l60E or the 4l80E? Also what is the transfer case number if it is the manual 4x4?

I have googled but cant find the answer!
 

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Look in the glovebox. There should be a sticker with 3 digit codes on it. Enter the codes at this website to find out all the options your truck has including transmission and transfer case.

http://www.gm-trucks.com/rpo-code-lookup/
 

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Discussion Starter · #3 ·
Thank you! I would totally use that search, but I am away for work right now and am searching on the internet for transfer case rebuild kits. Is there not a general combination for my truck? On wikipedia it doesnt say the 4l80e is used in my truck so i am assuming it is the 4l60e. So now how to know which transfer case i have...
 

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There are several used so I can't say for sure with your RPO codes or VIN.
 

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2021 GMC Sierra Denali CC 4WD Ultimate 6.2L
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4L60-E is trans with 4.8L, 5.3L

4L80-E is used behind a 6.0L 2500 truck

Should be this one;
Transfer Case,NVG 261-NP2
NP2 Transfer case, floor-mounted shifter

NVG number codes
Speeds - 2
Strength - 6 (1-7, 7 high)
Type - 1 Part-time 4WD

1 = Part-time 4WD
2 = Full-time 4WD
3 = Electronic shift
4 = Not currently used
5 = Torsen-type differential
6 = Computer controlled multi-plate wet clutch
7 = GeroDisc
8 = Not currently used
9 = Viscous coupling
 

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Discussion Starter · #6 ·
Alright so 4l60e it is then.

I have got conflicting opinions on the transfer case though. On another forum someone is saying i have the 241. This forum is saying its a 261.

I just would have thought that there would be a specific number for the manual shift transfer case that goes in the 1500 trucks with the vortec v8!
 

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2021 GMC Sierra Denali CC 4WD Ultimate 6.2L
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Simple way to find out, look on the option label in the glove box for the NP2 code.

241 was replaced with 261

Note - Manual transfer case can have either a floor shift or electric shift (3 push buttons). Automatic TC case has AUTO as the top button fora total of 4 push buttons.

RPO Description
NP1 Transfer case, electronic shift (NVG 263)
NP2 Transfer case, floor-mounted shifter (NVG 261)
NP8 Transfer case, electronic Autotrac (NVG 246)

NVG - New Venture Gear
 
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