I'm seeing transmission fluid transferring (internally leaking) from the transmission onto the transfer case. I have the C6 with a BW 1345 transfer case. Once or twice a year (truck not driven regularly) I have to drain the excess fluid from the transfer case. It is clearly overfilled. I remove the fill plug and drain until fluid is at bottom of plug. Then I add fluid to the transmission.

I know that there is an oil seal at the front of the transfer case. However I can not find any info on whether or not there is also a seal at the back of the transmission. The C6 in a 4x4 has a short tail shaft (extension housing) but the manual does not show if it also has a seal.

If there is a seal for the output shaft in the tranny, it would be redundant having a seal in the transfer case too. But I'm not sure.

I want to fix this problem and would like to have all the parts (seal) in hand before I start. If anyone knows for sure, please let me know. I'll keep researching this too. Thanks

 

Most transmissions rely on the transfer case's input seal as their rear seal. About the only application I have run into that does have a seal on each is the Getrag in my Dodge.

 

That's what I was thinking/expecting too. Makes sense.
Thanks.

 

I'm pretty sure the C6 does not use a seal at the rear, in 4x4 applications. This allows fluid to get into the adapter housing and lube the splines of the 2 shafts.
It is also normal for a small amount of fluid to drain out of the adapter housing when the TC is removed.
Very few "married" trans/TC setups have 2 seals, as the splines need some sort of lube, as there will always be a little movement between the shafts.

 

CB: thanks for asking the question, as I needed the same info.

 

No C6 extension housing (aka tail shaft, aka output shaft) seal with 4WD, 2WD only.

 

Thanks for clarifying that.

Now I'll order the seal and have everything on-site when I start the job. The hardest part is balancing the transfer case on my floor jack (with transmission adapter plate). I had the unit out once before (like 10 years ago) and it was a challenge. Mostly because the truck sits so high. I recall having to take the tires off and getting truck as low to ground as possible on jack stands so my jack would reach.

 

I just had mine apart. Broke a t-case adapter housing, or two...
I'm on 44's but I think you are taller. My method is to unbolt the case, get under the truck and sit up with my knees under the case, then wiggle it back so that the dowel pin disengages and let's me swing the front output straight down.
I then support it with the bottom with my knees, grab the top with my hands and slide it back and out.
Reverse for reinstallation.
The cases in these trucks are only around the 70lb mark with oil so they are not too bad to throw around.

 

I've done a couple of car transmissions that way (like 20 years ago) when I was in better shape.

PS. My truck rides on 37s, so your truck is probably bigger (or you have some huge fender cutouts).

Thanks for the feedback

 

Lowest point of my frame under the cab is 24" at ride height. The fenders are cut back to the body line, axle is about 4" forward of stock and it measures 2.75" taller axle to frame than my stock 96 F350. I do run a body lift but even then the truck is not overly tall.