Transfer case surgery....

[Bob Carriere]

Hi David

YEs I would love to see the diagram...... I will even name my first born after you.......


I have just checked the parts number on the oil seals of the 2 speed T-case I took apart..... there are 4 seals in all

all are stamped National...... H50300 is 3 " OD

next is H 30061 is 2 7/17 OD

and finally H 30300 is 3" OD but slightly different/larger ID.....and there are two (2) 0f them on the T-case.

The NOS GMC seal listed on EBay are the 50300...some are lsited as $3.99 loosely packed in a box of 11o and the individual sealed packages of the same 50300 is $5.99... is the individual packaging worth it????

NOw for Dr. Phil..... to late for me to leave the old seals alone.... one side was damaged... I presumed by the loose flaying axle shaft when it was previously broken.

Now I need replacements...dimension are...ID shaft size is 43.85mm......= to 1.728 inches....... outside dimensions which are critical to a good tight fit is 92.00mm

According to the seal/bearing guy I can get a ID of 1.732 (close enough) but he largest outside diametre OD is 72mm and I need 92mm. I am thinking of getting the local machine shop to make me an adaptor to fill the gap.... which I can epoxy and even spot weld inplace... in turn the new seal would fit in the middle of it.

Advise any one????

See picture attached of the said seal and location.

Next I have to source the bearings.... it seems that they are almost all the same tappered Tinken # 33?.... same number on all of them.... barn is to far to run to right now......

Stay tuned.

Bob C.