1998 - 2007 GM NP8 NP246 Transfer Case Complete Rebuild & Reassembly Part 1 (Chevy & GMC)

In this FIRST of a TWO part video series, we do a COMPLETE step by step rebuild and remanufacturing of the New Process Gear 246 (aka NP246) transfer case as used by GM starting in 1998 in EPIC detail. 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 since many parts are shared.

Link to part II:    • 1998 - 2007 GM NP8 NP246 Transfer Case Com...  

The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:

Retaining rings - GM 14037953, GM 12547465, GM 15662234, GM 682653, GM 15547397, GM 12547606: https://ebay.us/lVI2Sr or https://amzn.to/3IE1Ykq https://amzn.to/3o1tlLV https://amzn.to/3cfFyKp

Bearings - GM 89059659, GM 12547173, GM 12547464, GM 12350040, GM 12470557: https://ebay.us/6UJObG or https://amzn.to/3o1NxNR

Thrust washers - GM 15547390, GM 12470959: https://ebay.us/A1PX37

Shift fork pads - GM 14070291, GM 14037966: https://ebay.us/4ot7Kt or https://amzn.to/3aAY1AJ

Clutch pivot pin and o-ring seal - GM 89059638, GM 14071849: https://ebay.us/yjU17k

Shift detent plunger o-ring seal: GM 14071849: https://ebay.us/T69ArE

Clutch friction and steel plates - GM 89059648, GM 12547608: https://ebay.us/kZryua or https://amzn.to/3O7Y3O7

Kent-Moore J-36370 bearing installer: https://ebay.us/z4EKLS

Kent-Moore J-8092 drive handle: https://ebay.us/jMAXxJ

Kent-Moore J-42737 bearing installer: https://ebay.us/KodJYC

Kent-Moore J-22873 tone wheel installer: https://ebay.us/nEcczi

Kent-Moore J-45383 bearing installer: https://ebay.us/2WGeDw

Kent-Moore J-44295 clutch pack preload shim measuring tool: https://ebay.us/sEQZx0

Transjel Red assembly lube J36850: https://ebay.us/zjPHlM or https://amzn.to/3IFPo4v

Bearing driver set: https://ebay.us/mQuJ82 or https://amzn.to/3aB88Wg

12mm allen hex socket: https://ebay.us/lIpqB9 or https://amzn.to/3P7K4Jm

ACDelco 10-4017 / GM 88900402 Auto-trak II fluid: https://ebay.us/XZdWn9 or https://amzn.to/3P8hMyv

Snap ring pliers: https://ebay.us/jdqCFM or https://amzn.to/3wnVtNt and https://amzn.to/3HqzsE0

GM transfer case unit repair manual (use 1999 and later only): https://ebay.us/hAT8dc

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1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Chapters:
0:00 - Re-assembly overview
2:15 - Annulus gear retaining ring installation
4:08 - Input bearing installation
7:28 - Front output shaft front bearing installation
9:38 - Front output shaft rear bearing installation
15:26 - Control actuator lever and bearing installation
24:17 - Front output shaft assembly and installation
27:19 - Planetary carrier assembly reassembly and installation
43:00 - Shift fork assembly reassembly and installation
47:15 - Clutch lever and pivot pins installation
52:07 - Shift detent plunger reassembly and installation
54:41 - Rebuilding the clutch and rear output shaft assembly
1:07:28 - Clutch shim measurement procedure

Corrections:

1:10:13 - For model year 2004 units, whenever the second design clutch hub and the second design apply plate are used, a revised clutch pack stack height will have to be used. You will also need a fourth tool, a shim spacer J-44295-4 (0.085 in. thick) in conjunction with the clutch pack shimming kit J-44295 (included with the later J-44295-A version of the kit). This shim spacer fits into each of the three gap positions, before each of the feeler gauge measurement I show is taken.

#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.