99 Yukon transfer case problem

[1998Suburban]

NP246, NV246, and NVG246 are all the same case, the name relates to the time frame of the case and/or the person referring to the case. New Process gear became New Venture gear, ultimately becoming a division of Magna Powertrain and making New Venture Gear transfer cases at a plant on New Process Gear drive in Syracuse.
The NVG 246 and 246 EAU are different, however. The EAU case had a host of changes/upgrades.
As for driving it in 2WD I wouldn't unless you are ready to write off that case. If the front case half is damaged by a broken chain or debris in the annulus gear you'll have to replace it.

 

[Dryfly]

Thanks for the explanation.

 

[SunlitComet]

If you have had serious banging noise in the tcase in 4wd but quiet in 2wd. I would just drive it in 2wd until it blows or you need to fix it because you need 4wd.

 

[Dryfly]

If you have had serious banging noise in the tcase in 4wd but quiet in 2wd. I would just drive it in 2wd until it blows or you need to fix it because you need 4wd.

My local shop has it now.. I won't have a chance to tear into this for a while, and living in the Ozark Mountain, I hate not having 4wd. Thanks for the help, and I'll report back when he opens the t-case.

 

[SunlitComet]

PICS as well.

 

[Dryfly]

Well, here's an update on the transfer case. The shop opened up the case and discovered that the pump assembly had worn a small hole in the housing and caused all of the fluid to leaked out, causing half the unit to run dry, thus burning up much of the innards. It's toast.

I ordered a 90K miles unit though a local salvage yard wich should be here in a few day. Since we just got his with another winter storm over the weekend, it may be late in the week before I'm up and running again. Hopefully this t-case will be a good one and last me a while.

 

[SunlitComet]

If the original case is on the new one then you will likely have the same problem again. That had issues with the pump body wearing a hole in the case. The have a better case half as well as upgrade pump body parts. This applies to your tcase. http://www.youtube.com/watch?v=Nj5ZS8wOmNk

 

[99Vortec]

How many miles did the TC have on it?

Or is it irrelevant depending on how often 4WD gets used?

 

[Dryfly]

Thanks Sunlt I'm aware of the upgrade kit, but not the upgraded case half. Do you know where I can look into that? Also, how do you suggest I proceed? A local shop has the vehicle and I may still have time to hold him up while a local tranny shop does the upgrade.

99: the vehicle has 168K miles. Since I only bought it at 164k I have no way of knowing how frequently 4wd was engageged. I don't know if the pump spins when in 2wd mode, but I'm told that it's the rattling of the motor that.causes the star rings (if that's what they are called) to wear against the case housing and eventually wear a whole.

---------- Post added at 06:25 AM ---------- Previous post was at 06:23 AM ----------

Sorry Sunlit.. I just saw your link to the video. I'll watch that first.

 

[SunlitComet]

How many miles did the TC have on it?

Or is it irrelevant depending on how often 4WD gets used?

Miles or mode is not a big deal so much when you realize that the pump body can move back and forth slightly. So in drive is moves to a stop position where the case holds it from spinning and such the shaft drives the pump inside. But if the vehicle were to coast backwards slightly or go in reverse the pump body moves slightly against the other stop on the case. You can go forward and reverse forever at say 5 feet in each direction and doing it long enough can wear the hole in the case. Mileage would compound the issue.

---------- Post added at 11:45 AM ---------- Previous post was at 11:38 AM ----------

Thanks Sunlt I'm aware of the upgrade kit, but not the upgraded case half. Do you know where I can look into that? Also, how do you suggest I proceed? A local shop has the vehicle and I may still have time to hold him up while a local tranny shop does the upgrade.

99: the vehicle has 168K miles. Since I only bought it at 164k I have no way of knowing how frequently 4wd was engageged. I don't know if the pump spins when in 2wd mode, but I'm told that it's the rattling of the motor that.causes the star rings (if that's what they are called) to wear against the case housing and eventually wear a whole.

---------- Post added at 06:25 AM ---------- Previous post was at 06:23 AM ----------

Sorry Sunlit.. I just saw your link to the video. I'll watch that first.

http://www.transfercases.com/replacement.case.shell.htm $165 no core charge. And if you like they will sell you a whole rebuilt t-case assy for $795 which includes the new rear case. There will be a core charge till the older unit is back in there hands.