2024 Transfer Case Seal Leak

Tater86 · November 15, 2023

Anyone else on here been hit with the Transfer Case Seal Leak on their 2024? I just took mine to the dealer to have something else check and during their complimentary inspection they found my transfer case seal was seeping a little. Not a full on leak, but something they wanted to fix. The part is on backorder and they are not sure when they will get it. At 5,000 miles I was only down a 1/2 quart of fluid.

I'm not that familiar on transfer cases, but what should I be looking out for while I'm still driving it? I have a two week hunting trip coming up and want to make sure I'm not stranded.

Thanks!

diyer2 · November 15, 2023

How many miles will you travel on your hunting trip? You have 1/2 a quart lost in 5k miles if it doesn't get worse.

Tater86 · November 16, 2023

11 hours ago, diyer2 said:

How many miles will you travel on your hunting trip? You have 1/2 a quart lost in 5k miles if it doesn't get worse.

Less than 500 miles most likely. Hopefully the part comes in within 2-3 weeks.

Dunn · November 28, 2023

transfers the truck from 2wd to 4wd.....squirt some extra fluid in their for your trip if your concerned......super simple

ssgballistics · December 28, 2023

Had my truck (24’ Silverado 2500HD gas CCSB) on the lift changing out the rear diff fluid. Found my transfer case is leaking. Nothing major, but don’t like a few month old truck leaking fluids. Truck has 7200 miles on it.

P.S. I was changing the rear diff fluid because it was about a quart low when I checked during the 1000 mile initial service. I added a quart of 75w-90 mystik synthetic to top it off. Didn’t want mixed fluid in the rear end long term.

the8rotor · December 29, 2023

8 hours ago, ssgballistics said:

Had my truck (24’ Silverado 2500HD gas CCSB) on the lift changing out the rear diff fluid. Found my transfer case is leaking. Nothing major, but don’t like a few month old truck leaking fluids. Truck has 7200 miles on it.

P.S. I was changing the rear diff fluid because it was about a quart low when I checked during the 1000 mile initial service. I added a quart of 75w-90 mystik synthetic to top it off. Didn’t want mixed fluid in the rear end long term.

You bringing the truck in to the dealer? Good luck. Sure have a lot of leaky 24's rolling around

ssgballistics · December 29, 2023

I’m taking it to the dealer on Tuesday morning.

gemarsh · December 29, 2023

17 hours ago, the8rotor said:

You bringing the truck in to the dealer? Good luck. Sure have a lot of leaky 24's rolling around

gm is sounding like the good ole days of the gm 2-stroke Detroit Diesel!

Fill the oil and check the fuel.

Another JR · December 30, 2023

On 11/15/2023 at 4:59 AM, Tater86 said:

Anyone else on here been hit with the Transfer Case Seal Leak on their 2024? I just took mine to the dealer to have something else check and during their complimentary inspection they found my transfer case seal was seeping a little. Not a full on leak, but something they wanted to fix. The part is on backorder and they are not sure when they will get it. At 5,000 miles I was only down a 1/2 quart of fluid.

I'm not that familiar on transfer cases, but what should I be looking out for while I'm still driving it? I have a two week hunting trip coming up and want to make sure I'm not stranded.

Thanks!

Based what folks are reporting here, the transfer case may have been under filled at the factory, so your fluid loss in 5000 miles may have been much less than the 1/2 quart.

Tater86 · January 2

The output shaft seal was bad so that was replaced, but about a week later it was leaking again where the two sides are matted together on the main transfer case unit. It's going back in on Monday to be checked again.

newdude · January 2

They've been having problems with the seals between the transmission and t-case since the 2020s came out. Its a stupid design seal setup they went to. Seems to only be affecting the 10 speed trucks.

Here's the PI on the leak situation - MC-10239150-9999.pdf (nhtsa.gov)

Here's the PI they have on the seal on the T-case side and how as of 2022 they are engineering a special tool for installing the seal to the proper depth. MC-10201286-9999.pdf (nhtsa.gov)

Both seals on either end have to be installed at a certain depth point on both components. I wouldn't be shocked if its a misalignment issue going on during component assembly so transmission or T-case, or they are having an alignment issue during powertrain assembly so when the t-case is being mated to the transmission as they want to make sure the bolt sequence is followed when installing the t-case.

Quote

Note: The cavity between the Transmission and Transfer Case is a wet cavity by design. The Transfer Case Input Shaft Seal is a double seal to prevent fluid transmission and transfer case fluid from intermixing with each. If either side of the seal leaks fluid will leak from the weep holes between the Transmission and Transfer Case.

Note: It is being reported that the t-case input seal may be installed backwards, as a two piece seal back to back, and the replacement seal may also come as two seals to be installed. Correct orientation if two seals are received is metal clad together, which may be rubber coated, garner springs need to facing opposite of each other, one spring facing the t-case input gear, and one spring facing towards the trans output shaft, additionally, each seal may have three tabs, one seal protruding tabs, and the other inverted tabs, those tabs are to be aligned for proper installation.

Marvin Josue Aguilar · February 5

Me too. My transfer case seal is leaking substantially. I have a 2024 silverado 3500 hd; with only 7k miles. How is this possible on a new 100k truck?

Pryme · February 8

On 2/5/2024 at 11:56 AM, Marvin Josue Aguilar said:

Me too. My transfer case seal is leaking substantially. I have a 2024 silverado 3500 hd; with only 7k miles. How is this possible on a new 100k truck?

I must be blind but even after clicking your pic to show the higher resolution I can’t see any leak. Where is it

Tater86 · February 26

Well, looks like I'm going back for a 3rd time for the transfer case leak. I think I need to start finding a new dealership for repairs. It just sucks the next closest one is an hour away. The rate I am going, I'll be able to claim Lemon Law soon.

newdude · February 26

On 2/5/2024 at 12:56 PM, Marvin Josue Aguilar said:

Me too. My transfer case seal is leaking substantially. I have a 2024 silverado 3500 hd; with only 7k miles. How is this possible on a new 100k truck?

Looks bone dry Marvin.