NP241C Transfer Case - Seal Replacement

[@prevost8686]

Very common issue on high mileage units. When I replaced mine it was without a doubt the hardest rubber seal I have ever replaced. The rubber in the seal was petrified and hard as a brick from the heat and from the fluid.

[@rporestorations]

Same here! It felt like I was chipping out plastic.

[@whysoserious434]

Did the front output seal leak? I have replaced mine 3 times. 1st was a skf, 2nd a timken 3946. 3rd, I put a speady sleeve on and national 3946 seal. Still leaks but not nearly as bad as it was the first 2 times. Any suggestions?

[@eugenkolb7402]

Is the seal spinning? I hade same issues by an Differential. The Seat from the gasket Was damaged,so the seal starts spinning on the shaft. When you put a sleeve on just the space between shaft und seal gets repaired.

[@Fishwheelspdx]

Do you have a part number for the seal? I’m going to tackle this job soon, Same thing is going on with mine.

[@rporestorations]

GM # 14095609 is the input shaft seal.

[@Fishwheelspdx]

@@rporestorations thanks you

[@ManicMechanic96]

​@rporestorations do you know if that would be the same on a passenger side drop transfer case on a 90 k5?

[@joebushell2438]

Why didn't you just remove the input seal front plate to gain access to back of seal?

[@timmyboy836]

Hey there I was interested in this solved your problems I thought the rear transmission seal might need to be replaced at the same time

[@rporestorations]

I haven't had any issues since.

[@kaydenmorst4962]

whats the part number for the seal on the front driveshaft.

[@rporestorations]

GM 14095609