Building a GM NP246 "HD" Transfer Case for a Silverado 1500HD
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- เผยแพร่เมื่อ 22 ม.ค. 2022
- There are just a few differences between a standard NP246 and one that goes in a Silverado 1500HD. Today we build one!!
#NP246 #SilveradoHD #TransferCase
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Dont know if you check old videos of yours, but. I was having a problem with my 2000 GMC sierra 1500 4x4. You gave me all kinds of ADVICE AND WHAT TO LOOK FOR AS TO What the problem could be as to why it wouldnt go into 4 lo. FROM THE FRONT shaft sensor, speed sensors, tone rings, etc. None of it was the problem.Learned things though. HOWEVER , I think I recall you or my brother saying WHAT was done to the vehicle fairly recently? And then after 9 months of having no 4 lo , ( 4 hi worked fine)I thought , I had installed E fans!! Sure enough, the program installed was for a 2wd!!!! Took it back to the tuner and he corrected the problem. Now all works and everything is right. Thank you for your help, it was much appreciated.
Glad I could help in any way!
Thank you so much for creating this video. I followed along re-assembling my 246. Next I will search for your Encoder Motor video. Thank you again!
Thanks! I'm glad it was useful to you!
Ever find the encoder motor video?
@junior mon no actually I didn't.
Thank you for your videos,I'm learning lots.
God bless you.
Thanks brother! Glad you like the videos!
Great informative video. Definitely subbed your channel. Thanks for taking the time to share your knowledge with the world.
Thanks for watching!
Very enjoyable to watch. Education!
Thanks brother!
Great video!!
Thanks brother!
Great video thanks!!
Thank You!
Hey man thanks for the great videos. I recently installed a pump rub fix kit and went to put it all back together, laid down silicon or whatever comes in the merchant kit and I could not get the dang snap ring you describe at 42:00 in place due to my worn out case. I will try again in a couple days with better pliers. I didn’t tighten down the case bolts just had started them then tried to get snap ring sorted.
That snap ring will fight you sometimes...If you hold your tongue a little to the left, it helps...lol
Thank you
Glad you enjoyed it!
Never seen inside a transfer case nice job
Thank you sir!
Nice
Nice video
Thanks brother!
I did a conversion like this many years ago on my 246 in a 2005 tahoe to be used with a duramax allison conversion, one thing I found was that using the input gear to mate with the allison, I got an input gear for the 263xhd, the pilot cup bearing to carry the main shaft was to large of diameter and needed to get a conversion bearing to fit the larger diameter of the input shaft and the smaller diameter of the main shaft, this would be properly support the shaft to the input gear. I didnt notice if you addressed this, is there a larger shaft for the 246hd that fits this larger input gear, or is the cup bearing the same that fits both the input gears you used?
No. Physical size of the two input shafts are identical except the spline size and count. The XHD is beefier all around, as you found out...
Sooo quick question if i was to take a transfer case from 1500 take apart replace input shaft and the planetary gears with ones for the 2500 it would work on my 2500 both are np246 with auto 4wheel just the spline size is different
In a round about way, yes. Never seen a 246 in a 2500 unless its a Suburban...
I just rebuilt my np 246 and before installing im wondering about the range selector, any tips on where the roll pin should be on the selector? Thanks!
If you are referring to where you should put it when the case goes back together, It really doesn't matter. Your encoder motor will only go on in one position.
Ya...this summer I have my African Neighbor Toyota Sequoia transpere case..replace Acuator.
I only have a Walmart I pad...far as video instructions on utube which I found a few.
I thought of purchase a smart tv from Walmart then I'd be going back and forth bedroom to garage...I don't think the smart tv can reach without cable hook up cords...rachet jaw Jerry
Lol
Hey Smitty, I have a 2002 chevy 1500HD 4x4 with 6.0 with the 246 transfer case and I'm having a hard time to find the rear output shaft seal part number and the bearing part numbers for the Transfer case. I appreciate your video on the rebuild as I'm about to do the same to mine. You put out great videos and it's great to learn from someone that knows what they are doing. I watch your videos daily and I'm happy to be subscribed. Thanks
You should be able to pick up the booted output shaft seal at any parts store. The rear case bearing is #88962351. I'm glad you find the videos useful! Thanks for the sub!
I go to autozone and they say they don't have an option for the rear output seal in their system for np 246 so I was just looking for part number for the rear output shaft seal for the 1500HD 246 T-case. Thanks
@@adamstrickland2879 Odd...I'll see if I can find a part number somewhere...
Hey Irocin Z, thanks for the video! I'm having a issue with my 06 1500hd.. shift motor definitely work and the front actuator also work but i'm not able to engage the 4x4. No error or nothing, the truck think it is in what ever position I put it in. Did you ever saw a shift fork broke or something? there is no noise while driving and I can hear things moving in the T case when I shift from 2wd to 4hi or 4low but never able to physically engage it. Any advise would be very appreciate thanks!
Yes, I've seen broken shift forks
@@IrocinZ thanks for replying! Would you suggest anything to test while it still on the truck? After that, I will remove it and open it. Way less scary with a video like you did
@@antoinemartel8317 Start with the obvious and pull the drain plug and see if you get chunks. Other then that, I'd say you're pretty much at the removal state
Just started watching your channel and really enjoy it.
I’m just installed new bushings in a 4l80 and they’re too tight on shaft, what method should I use to get them to fit?
You can take some fine sandpaper or emery cloth and polish it up. I've found that if you use a hammer with an installer, it will mushroom the side you hammer and flare that side so its tight. The best way on those is to use a shop press to keep that from happening
Ok thanks
Did you booger the bushing install?
I'm not getting the clip through the hole at the end, did I miss a step? And there's no seal on the output cone? Thanks.
Elaborate on that a little...what clip and what seal? On the output shaft??
Honda Ultra Flange is the best case sealer money can buy and you wont have the clogged screen problem, the Honda stuff doesnt migrate, just pulled my case apart and the OEM pump tab was still perfectly in place but it still had almost worn thru the case, the problem isnt the oil pump tabs but the Magnesium case is way to soft
Agreed on the case. I think they did that for weight more than anything...
Do you know the part number or where you got that pump saver kit from?
Merchant automotive has them
Smitty, have you tried installing the 1.5” chain and gears from a 261/263HD or XHD into a 246 T-Case?
I have not. Don't know that they'll fit because of the clutch pack in the 246
@@IrocinZ thanks much for the reply, your videos are great, prolly saving a lot of people a lot of money…I wonder if the 1.5” gears ID is the same as the 246 shaft OD and same spline count, as well as same journal width…it looks to me like they’ll fit while watching your video, I have heard others have put them in no problems but without specifics hard to say.
Can u use 246HD transfer case on 1999 regular suburban 5.7 k1500 246GM /272
I'm sure you could build something of that nature. All the physical dimensions are the same, its just what's inside the case.
What is the shift pattern for this variety of np246? I am going to be manual shift swapping my 04 2500. I plan to use a posilok front differential actuator, weld the clutch pack fully engaged, and build a shifter mechanism. Do you forsee any issues besides the service 4wd message?
If you have a 2500hd, it won't have the 246 transfer case. It will be a 263hd which doesn't have a clutch in it, but it does have electronic shift. They did make a manual shift version and I think it was a 261. More rare, but they're out there
@@IrocinZ So my 2500 is not the HD but the LD. It's the same as the 1500hd with the 6.0, 4l80, and sf 14 bolt. It definitely has the np246. Just wanting to avoid any unforseen issues.
@@nebraskanimalhemi Interesting...Was not aware they made a 2500LD as sale. I knew it was badged a 1500HD, but not a 2500.
@@IrocinZ Yeah they made the 1500hd and the non HD 2500. Welding the clutch drum shut shouldn't cause any issues other than 4wd being locked in fulltime when engaged right? Also not sure if there is a 2 hi indentation or just 4hi, neutral, and 4lo with 2wd being controlled with the front axle actuator.
Found this video a day late and a dollar short.. I’m swapping my transfer case and I’m sure I have the regular on.. when looking for replacement,what numbers do I look for on the tag that’s on the outside of Tcase housing.?
There should be a tag on the back of the case near the drain plug. It will be round and red and should say NP246 on it. If you have a 1500HD, the tag will be the same, but it will be behind a 4L80e. The input shafts will be different between the 4L60 and 4L80. The NP246 transfer case behind the 4L80e will have a 6 pinion planetary set in it however for added strength.
@@IrocinZ ok so I need I need to make sure what trans I have then go from there.? Also.. it’s bolted in abut No 4X and No Speed’O.. is that possible,to bolt it up and drive,just no 4x4.?
Yes, but you need a speed sensor for the trans to work properly.
@@IrocinZ so the speed sensor,that was working before,should still work.?
It goes on trans NOT Tcase.. ?
@@flingone8888 On a 4x4, the speed sensor is in the transfercase. On a Np246, there are three speed sensors. One above the front output shaft and two above the rear shaft.
Are that transfer case all wheel drive
The NP246 transfer case Auto 4wd capable, which means it has a clutch in it and can vary the output to the front axle as needed. An AWD transfer case both driveshafts will turn all the time and you don't have an option to disengage it.
How did you remove the front output shaft bearing in the case half?
You have to remove the output seal and there is a snap ring underneath that seal. The best way to remove that seal, for me anyway, is to get a flat blade screwdriver and try to collapse the outside to put it out. Be patient as you don't want to damage the case...
@@IrocinZ I was thinking of the caged needle bearing on other side of the case.
@@exploringgodscountry That one you have to use a puller and make sure you protect the case from putting a window In it. Like a three jaw outside puller similar to a pilot bearing remover
@@IrocinZ did you have a video with setting up the clutches? Hate to buy that tool contraption.
@@exploringgodscountry No, I did not...
Few questions... (1) You confused me a bit. I have a NP246 from a 2001 Tahoe. I want to upgrade what I can. The sun gear from the NP246 should be compatible with the 6 pinion planet right? I have a 4L60E so I need to have the right splines for that and cannot switch to that HD sun gear / input.
(2) What are your thoughts about chains? Do you use OEM only?
(3) The parts store doesn't carry the Autotrack fluid anymore. They said the Dextron VI will work. I hear conflicted messages on that...?
Okay, on question 1, Yes you can put a 6 pinion planetary with a 4L60e. You just need to use your input shaft from the old planetary. (2) I've never replaced a chain before as they don't usually fail. If you're wanting to go with the wider chain, you have to change both your gears. On that note, I'm not sure if the splined area of the gears are the same between the two as I have never been asked to do that upgrade. I've always just done what came factory. (3) If you use any different fluid, Use Dexron 3, not 6. The older new process transfer cases don't work well with 6, and I would use a synthetic.
@@IrocinZ one more question... the clutch pack, what do you do with those? I'd like to update it to something better if anything is available but hard to find specs on the clutches. Thanks for answering my questions. Big help! I see lots of teardown videos but not many with upgrades. Your video was one of most helpful.
Not sure if there is a HP version of the clutches in that T/Case. I've always used factory ones without an issue.
@@IrocinZ thank you for your help! I owe you a beer! Do you check clutch stack up or just install them? I cannot find a service manual to rebuild these with the specs.
@@exploringgodscountry There is a procedure for checking clearance in the GM manual, yes
Oil as long is synthetic can you used mobil 1
I don't understand your statement....
Question. can you used mobil 1 in transfer case it's full synthetic?
@@rubenroman3229 As long as it's equivalent to Dexron 3, then yes.
Far as Tiawan...as a Machinist's...we have found there Asian Steel isn't as good as American steel ..has to do with climate
He has only been in USA SINCE 2003
I HAVE asked him about getting attacked by African lions and stepped on by Elephant
He said....They are in Kenya only there
Lol
His name is Angel..but I call just call him Buddy..lol
And he talks so fast ya can't understand him much..and I've told him slow down speach..
Lol
Also his mechanic level is about level 3
He said...the wars in Africa are tribal wars and the public people are fine...he said Africa is about the same as here as we have went to my Salvage yard twice now..
No luck 2nd attempt because Toyota transfer case Actuator takes a open case to remove Actuator on some Toyota transfer cases... frustrating yes he has the type with a locking dowel pin to the fork assembly
The Toyota transfer case is a Borg and Warner made i believe
Am going to help him this Spring ..keep him away from a arm or leg invoice...and I can continue with assembly success.
It just sets in his driveway..stick in 4x4
I better Tex him soon tell him to add five gallons of new gasoline with stable
So I can avoid more issues...because at that he is at level 1
Far as understanding mechanic situation
LMMFAO