1998 - 2000 GM OBS K Truck w/4L80E Autotrack I (NP246) Transfer Case Removal Process (Chevy & GMC)

In this detail oriented video we go thru the complete step by step removal of the New Process Gear 246 (NP246 or 246GM) transfer case from a GM old body style (OBS) K truck, the first generation Auto-Trak (or Auto-Trak I) type with RPO NP8. The vehicle illustrated is a 1999 Chevrolet Suburban LT K1500 which has the 4L80E transmission, commonly found on K2500 and K3500 grade trucks (as well as K1500 trucks with 6.5L diesel engines like this Suburban). The NP246 was introduced in 1998 and used thru 2007, later being renamed to NV246 (for New Venture Gear). This video may apply to new body style (NBS) trucks transfer case removal too, but there are going to be differences from the OBS layout so we capped the year range in the title to be thru 2000 only.
The bigger size of the 4L80E transmission, along with the Suburban's utility body style, presents for some extra clearance challenges that we will go thru for dealing with the removal of the NP246 transfer case from the vehicle. The entire transfer case drop procedure is done WITHOUT the need for, or use of, any jack stands. You can perform this DIY repair procedure using the trucks regular ride height alone.
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:
Paint marker: ebay.us/eJmwwl and amzn.to/3msANz4
Craftsman stubby gear wrench 15mm: ebay.us/MPx1pG and amzn.to/3msILYI
Transmission jack: ebay.us/8hcBjO and amzn.to/3tkqDEr
And if I've saved you some $$ here, consider some coins for the coffee tip-jar! ko-fi.com/drshock
1998 1999 2000
Chapters:
0:00 - Process overview
0:37 - Transfer case leak overview
1:34 - Rear driveshaft removal
11:18 - Disconnecting front driveshaft
20:04 - Skid plate removal
21:56 - Disconnecting wiring harnesses
25:50 - Disconnecting the vent hose
27:27 - Draining the fluid
29:34 - Separating the transfer case from transmission
34:12 - Lowering and removing the transfer case
52:30 - Inspecting the transfer case externally
#drshock #np246 #obstruck #obstrucks
Disclaimer: DrShock, the alias for the human content creator for this KZbin 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.

[@cbackerman]

Amazingly detailed video, thank you so much! For the time and energy spent. Gearing up for this project, and the details you cover are invaluable. Amazing teacher and freind.

[@dustinw5527]

Thank you so much for taking the time to show this!!! The little details are a world of help! I am currently working on the same set up and have been searching for this. I am attempting to do this alone so wish a little fella some luck.. Thank you again.

[@djrowe10]

Man it must be nice working with such amazingly clean parts. Here in the Cleveland Ohio area winter just destroys our vehicles. I own a transmission business "power & performance shifters" and I enjoyed your video while appreciating your time teaching others. 👍

[@josephmatthews5529]

Very nice video. Well done. Thanks.

[@djrowe10]

Oh yeah in the future just using a pry bar behind the u joint and between the yoke, a hard jerk forward will pull it right out of yoke saddle and move drive shaft into transfer case. ❤

[@junkmatt]

Very helpful!

[@joestone2068]

Boil Tallia Dr you are quite the mechanic I hope you don’t mind but if I have any questions on these because I have one as well I would love to be able to share it with you Thanks Joe

[@orabates1823]

Wouldn`t it been easier to support the transmission with a transmission jack. Then you could have taken the transmission crossmember complete out of the way.

[@DrShock]

The transmission is of course on a transmission jack as shown, that's the only way to perform this operation (the 4L80E transmission weighs close to 300 lbs).

[@TheJeffe613]

👍🏼

[@junkmatt]

How about how to put this back in! Your video was extremely useful in getting the old one out, but we're now struggling to fit the rebuilt one back into place.

[@DrShock]

I did not make a video on that because it's just the reversal of the removal steps I went over in this video. I would recommend you install the transmission first, then reinstall the transfer case (if you did have the transmission removed). I would suggest having a helper for the reinstall, rather than using a jack. I have found that having an extra pair of hands available gives you more flexibility to maneuver the unit into position around the transmission output shaft. Two adults can push this into position, balancing the unit just with their leg muscles, as this model is only around 85 pounds without the fluid.

[@phillipbremer7715]

ya six points hate 12 old ways old tools one thing or another rebuild term bullet proof no only way is change it all everytime leaks seals ineaged is term part- time lets just say all gets miles heat wear just junk like old 205 or even sm465 conversions adapt them splines sad dont build like use too oh had get out luck them hubs oh had push clutch ya old stuff build like heavy equipment machinery