simple tcase question

[dulcevendetta]

hey all, i have a 89' f250 diesel with a BW1356 transfer case bolted to a ZF5 was just wondering is the tranny oil shared with the tcase? or does it have it's own oil supply?

 

[jperecko]

My specialty is a T19 with a 1345 transfer case but the 2 t-cases are similar and the answer is no. There is an oil seal on the input shaft. I assume similar for yours.

 

[OLDBULL8]

There is a oil fill plug on the 1356, don't remmber if it's on the side or rear.

 

[Goofyexponent]

the fill plug for a 1356 is on the rear of the t-case. You guys are right though, the transmission and t case are both sealed units and use their own oils, they do not share. I used to run transmission flud in my old 1356, what is best to run in them?

 

[6 Nebraska IDIs]

I think you're supposed to use ATF in the transfer case, but its been so long I can't remember.

 

[adam g]

Atf in both the t case and the zf5. I have had a few 5spds that were hard shifting and the owners didn't know why. They had put 90 weight in.

 

[Dsl_Dog_Treat]

Yup separate oil sources, unless a seal goes bad between the 2. Mercon III.

If ya separate the two in the truck, you'll think they share it tho.

 

[trackspeeder]

the fill plug for a 1356 is on the rear of the t-case. You guys are right though, the transmission and t case are both sealed units and use their own oils, they do not share. I used to run transmission flud in my old 1356, what is best to run in them?

Any Mercon/Dexron or Mercon V will work. You could spend a couple bucks more and use synthetics. Mobil 1 is what I feed all my T cases.