Transfer Case: Reseal

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This is a short guide for resealing a 5 speed transfer case. The 6 speed is similar. Before starting this guide I recommend reading the full manual for resealing the case and all of its variations are located at the end of the transmission service manual. It can be found here:

This is a general guide that shows real pictures instead of the "cartoon" diagrams. As always do the work at your own risk and it's generally a good habit to check the oil level on every oil change.

5 speed transfer case.



The reseal kit, complete with 5 speed and 6 speed seals.


Start by pulling out the vent and unbolting the center section. There are 5 bolts on the 5 speed and 7 bolts on the 6 speed. You might need to gently tap the gear housing. Be careful to avoid damage to the oil guide pipe on the 6 speed.


Now unbolt the 6 bolts on the cover. Do not remove the center bolt on the 5 speed cover. Then tap the cover on a bolt boss to spin it.


Once spun, put the gear housing on its side and tap the cover off. Be careful as the spool will then be free.


Remove the spool.


Using a brass drift and plastic hammer tap out the input shaft seal.

Seal installed


Seal removed


5speed Press the seal from the outside until it is flush with the outside housing. Then use the supplied spacer and press until the spacer is flush with the housing.

6pseed Use a 36mm socket to press the seal until it touches the seat. IMG_2476.jpg

Seal installed


Remove the oring on the housing cover. (some cases may not have the oring). Lube the cover with gear lube and reinstall the oring, make sure it's not twisted. If there is no oring groove do not install one.


Place the input spool on a table (big end down) and then lower the housing on top. Make sure the spring in the seal does not pop up or that the seal is twisted. Hold the spool and flip over. Make sure the spool turns smoothly.


Put a bead of sealant on the gear housing to cover flange. Looping all the way around the bolt holes. Then loosely install the cover, use two bolts to align the holes and then tap the cover down. Put some lock and seal on the bolts and torque down to 220in lbs.

TODO:missing picture:

Remove the gear housing to adapter housing oring. The oring is located on the center housing on the 5 speed and in the gear housing on the 6 speed. Clean the area thoroughly and replace the oring. There are two different orings be sure to use the correct one.

TODO:missing picture:

On the 6 speed only put a bead of sealant on the gear housing adapter housing flange(gear housing side). Loop around the bolt holes.

TODO:missing picture:

Apply lock and seal sealant to the bolts and torque to 220 in lbs. On the 6 speed one bolt is longer that goes in the position with the raised boss.

TODO:output shaft seal:

Any questions feel free to contact 'Toni' on 3si.