1998 - 2007 GM NP8 NP246 Transfer Case Complete Tear Down & Disassembly (Chevy & GMC)

In this EPIC level of detail video we do a COMPLETE step by step tear down and disassembly of the New Process Gear 246 (aka NP246) transfer case as used by GM starting in 1998. This NP246 example is a first generation transfer case known as the Auto-Trak (or Auto-Trak I), or as regular production option (RPO) NP8. The NP246 transfer case is very similar to the NP236, and we will call out those differences between the NP236 and the NP246 as we go where we can, but we're focused on showing the NP246 disassembly here. These transfer cases were built by New Process Gear for both GM and Chrysler, later changing their name to New Venture Gear. After the name change, this model became the NV246 (or NVG246). The NV246 was also used on several Dodge and Jeep model trucks as a result of the Chrysler partnership, so this video will have some value there as well. However, we will be using the genuine GM factory service information for the steps involved, referencing any special tools required along the way.

This particular NP246 was not exhibiting any functional issues whatsoever, but did have a long term multi-year leak from the rubber plug for the spring clip access port on the top of the rear case half that warranted attention (leaks in this area are not uncommon). Upon opening up this 246 transfer case we find the unit still had fluid, though significant portions of this aged fluid had become more of a varnished hardened mud or goo from heat and age. Fortunately, this is the only problem with this NP246 transfer case so it was caught in time, and a full rebuild with all genuine GM parts will have it back into service quickly.

Link to rebuild video:    • 1998 - 2007 GM NP8 NP246 Transfer Case Com...  

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1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Chapters:
0:00 - Disassembly overview
3:30 - Removing fill & drain plugs
5:14 - Removing the vent and encoder motor
7:24 - Removing speed sensors
9:13 - Removing the access plug and output shaft seal
11:04 - Removing the transfer case bolts
14:18 - Separating the case halves
16:56 - Removing the pump wear sleeve
17:25 - Removing the drive chain, sprockets, and pump assy
26:12 - Removing the rear output shaft assembly
27:00 - Removing the clutch lever and shift fork assembly (Part I)
29:32 - Removing the shift detent assembly
30:55 - Remove and disassembly the front output shaft assy and seal
40:00 - Removing the clutch lever and shift fork assembly (Part II)
42:20 - Removing the input shaft seal and planetary assembly
47:10 - Disassembly of the planetary assembly
49:00 - Removing the input bearing
50:12 - Removing control actuator assembly
51:34 - Removing the front case half ring gear retaining ring
52:31 - Removing the input gear pilot bearing
53:45 - Removing front case ring and front output shaft bearing
1:00:13 - Removing the control actuator bearing
1:02:00 - Removing the rear output shaft bushing
1:03:45 - Disassembling the rear output shaft assembly
1:21:01 - Removing the identification plate
1:21:24 - Cleaning and inspection tips

#drshock #np246 #obstruck #obstrucks

Disclaimer: DrShock, the alias for the human content creator for this YouTube channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, vehicle whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle.