1998 - 2007 GM NP8 NP246 Transfer Case Complete Rebuild & Reassembly Part 1 (Chevy & GMC)
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- เผยแพร่เมื่อ 9 ก.ค. 2024
- 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 NP2...
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: ebay.us/lVI2Sr or amzn.to/3IE1Ykq amzn.to/3o1tlLV amzn.to/3cfFyKp
Bearings - GM 89059659, GM 12547173, GM 12547464, GM 12350040, GM 12470557: ebay.us/6UJObG or amzn.to/3o1NxNR
Thrust washers - GM 15547390, GM 12470959: ebay.us/A1PX37
Shift fork pads - GM 14070291, GM 14037966: ebay.us/4ot7Kt or amzn.to/3aAY1AJ
Clutch pivot pin and o-ring seal - GM 89059638, GM 14071849: ebay.us/yjU17k
Shift detent plunger o-ring seal: GM 14071849: ebay.us/T69ArE
Clutch friction and steel plates - GM 89059648, GM 12547608: ebay.us/kZryua or amzn.to/3O7Y3O7
Kent-Moore J-36370 bearing installer: ebay.us/z4EKLS
Kent-Moore J-8092 drive handle: ebay.us/jMAXxJ
Kent-Moore J-42737 bearing installer: ebay.us/KodJYC
Kent-Moore J-22873 tone wheel installer: ebay.us/nEcczi
Kent-Moore J-45383 bearing installer: ebay.us/2WGeDw
Kent-Moore J-44295 clutch pack preload shim measuring tool: ebay.us/sEQZx0
Transjel Red assembly lube J36850: ebay.us/zjPHlM or amzn.to/3IFPo4v
Bearing driver set: ebay.us/mQuJ82 or amzn.to/3aB88Wg
12mm allen hex socket: ebay.us/lIpqB9 or amzn.to/3P7K4Jm
ACDelco 10-4017 / GM 88900402 Auto-trak II fluid: ebay.us/XZdWn9 or amzn.to/3P8hMyv
Snap ring pliers: ebay.us/jdqCFM or amzn.to/3wnVtNt and amzn.to/3HqzsE0
GM transfer case unit repair manual (use 1999 and later only): ebay.us/hAT8dc
And if I've saved you some $$ here, consider some coins for the coffee tip-jar! ko-fi.com/drshock
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 TH-cam 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. - ยานยนต์และพาหนะ
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Hi,currently rebuilding a np-246 for 2095 chev Silverado and I have the j-44295 clutch shim tool, but I also require the plate no 4 that goes between part 2 and part 3 to determine shim, do you have the thickness of the spacer that goes between 2 and 3 ? Oh btw your videos are incredible you don't miss anything!
Thanks. Are you asking about the donut spacer that is part of the Kent-Moore clutch shim tool set?
@@DrShock thanks for the reply, no the original kit was a J-44295 and then later it was changed to J-44295A which includes what they refer to as a selector ,it goes between the part no.2 which is the donut weight, and the part no. 3 where you insert the feeler gauges to determine the necessary shim
A little more info, when the tool is installed , the new clutch pack is correct and the measurement is approximately 3.89 mm and with the old stack it's about 3.95 mm. Which is just to much. So there must of been a design change that changed the height of stack
I don't have this superseded version "A" of the tool, as it was not released until after the C/K truck (GMT400) era. I see that in addition to the original J-44295-1 base, J-44295-2 donut weight, and the J-44295-3 tall gauge tool they added into this "A" suffix kit two more gauges. The J-44295-4 and J-44295-5 shim selection spacers.
The data I was able to find (GM service bulletin 05-04-21-005 from August 2005) indicates these additional shim selection spacers are _not_ to be used in earlier NP246 clutches, but rather only on model year 2004. There was apparently a design change that removed the detent spring, and redesigned the return spring, starting in late 2003 for that model year and Kent-Moore introduced the spacer J-44295-4 for this new application _(Whenever the second design Clutch Hub and the second design Apply Plate are used, a revised stack height will have to be used. This implements a shim J-44295-4 (0.085 in. thick) in conjunction with the clutch pack shimming kit J-44295)_ is the exact quotation. Hope this helps. I was unable to locate any information on the purpose or usage of new shim spacer J-44295-5.
@@DrShock thanks very much for the in depth info, I can take the total measurement and deduct the . 085 and that should put me in the correct shim needed to set the clutch stack up, thank you for going out of your way to assist me on this, it is very much appreciated!
Your high level of organization and having your crap totally together gives me a weird anxiety when I look at my own workspace. But you did a stellar job showing a detailed reassembly of this TC and that is exactly what I needed.
You are such a great resource, my HVAC box in my 97 GMT is acting up and I looked to see if you had a video first.
30 ft-lb is the torque spec for the clutch pivot pins (2). Thanks!
Thanks!
You can use the actuator lever itself as a driver for it's needle bearing install. There is enough room. Just make sure you install with the o-ring up, be gentle when knocking it in and there's no need for a special tool.
Hi DrShock. Thanks for the videos, they are great! If you get a chance could you please measure the height of the step on the business end of the Merchant Automotive 10325 fwd output seal installer. I’d like to install the same seal in my sons NP263 but I don’t have the tool. I believe I can fashion my own installer, I just need to know how much deeper the inner part of the seal is pushed in relation to the outer flange. Thanks
Thanks, sorry I don't have that 10325 Merchant driver anymore. I just borrowed it to show as an example of an aftermarket tool.
شكران
Thank you for such an in depth reassembly video! What model are your snap ring pliers? I like the knurled tips.
Thanks. There's a link in the description for those tools.
There are two sizes I work with for such tasks, the larger one with the more parkerized finish is the G409P from Wilde Tools. The smaller one with the more black oxide finish is the 44900 from Lisle Tools. Both are USA made.
Got it!! Where did you get all the GM Part numbers?
Great. Since I do professional repair work I pay for access to the OEM parts ordering system like any shop would. The GM version provides the part numbers down to every single bolt and nut. There are search links in the description of each video for part though.
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When installing range fork do you simply put the roller into the selectors lever slot or is there a specific spot i should have it at?
You want to line it up into the slot cut out for it, and then when you have the assembly further along, you use a wrench at the encoder motor side to reposition it back into 2 HI position you started with. Part II I believe I goes over that position re-alignment part.
Could this series of disassembly and assembly be applied to the NP-136 used in a 2001 Chevy Astro AWD? Thanks
There would be alot of similarity between the NP236 and the NP246, and I tried to call those out as we go thru the service manual rebuild in this video series.
But the 136 would be even further differences, and not one I'm directly familiar with to comment on specifically. I would presume if you've worked on the NP236 then you would find the 136 very similar though many differences from the 246.
@@DrShock Thank you! Also, how does one check if the chain is stretched and needs to be replaced?
Unfortunately GM never published a chain specification or mileage. So there's no real guidance to go on. Personally, I just swap them out during a rebuild if they are suspected to be the original OEM.
Did you do a video of the tear down? Explained what goes bad with the 246?
Yes, there is a two part disassembly and removal series. Here's a playlist with everything NP246 related - th-cam.com/video/UA3Y3CHPgEA/w-d-xo.html
40:24 “you don’t want to force it” meanwhile been beating it with a mallet for almost 2 minutes
Yep, that's a rubber mallet tapping lightly for _persuasion_ due to tighter tolerances with new OEM parts, or you could use a small block of wood. You do *not* use metal tools here, those approaches would come under the _forcing it_ category.
I need to learn where to get that clutch tool for cheap haha
Как всегде полезное видио! Привет из вражеской России!)
Do all these GM parts come in a master rebuild kit?
No, unfortunately GM only sells their parts individually.
The shims are slightly off from the advertised thickness.
The GM replacement one I bought measured out exactly as spec'd.
@@DrShock wow that is awesome. I should elaborate, I bought pressure and apply plates when I built my 4l60e and they were all slightly thicker than the spec.
Control actuator shift cams aren’t interchangeable?
Where are you located? I wish I could rent a J44295!
I believe if it were me I'd go find a NP/NV 243 transfer case to put in the 246s place.
несмотря на то что на английском, но очень полезное видео, спасибо ! а как называется этот колибратор для фрикционов ? / despite the fact that it is in English, but a very useful video, thank you ! and what is the name of this colibrator for frictions ?
Вы имеете в виду инструмент, который использовался?
@@DrShock я про то и с помошью какого приспособления/инструмента измерить и подбирать фрикционные диски , как он называется ?
@@DrShock Kent-Moore J-44295 ?
Да, это номер модели. Это инструмент для выбора упорной пластины пакета сцепления.
@@DrShock спасибо