transfer case

[scheff]

i have the bg 1350 t case. it is leaking in the back by the drive shaft. i think it is the seal right there but i can not take it apart right now because i have to go to work soon. does anyone no how to be sure that it is the seal for sure? if so how would i change it? any help would be great im only 18 and still trying to learn. thanks.

 

[bigtruck94]

Are your bolts to the drive shaft to the transfer case all tighten up?

 

[bigtruck94]

Disregard that comment. I had a stupid moment. What I meant is, are the bolts connecting the drive shaft to the transfer case tighten up?

 

[scheff]

i belive so it look like it is leaking behind that tho

 

[4.0B2]

it'd just about have to be the seal there, I think... if that's where it's leaking. I don't know why else it would leak there.

 

[scheff]

alright thanks. do you know how hard it would be to change?

 

[FritzTKatt]

Block the wheels. Jack up the rear end.

You can just drop the shaft off the flange and it should clear (even on a supercab with the carrier bearing). Use a 30mm? regular socket with the trans in gear.

Pull out the old seal with a puller or screw driver. Clean the surfaces, check for excess abrasions, and install the new seal with a larger socket to tap it in gentle and square.

Throw some blue loc-tite on the flange nut, put anti seize on the flange face (bet you had to remove the d-shaft with a hammer, eh?), and a drop of blue loc-tite on each of the shaft bolts. If it's a yoke style then just clean it out, put new bolts and straps on, and a drop of loc-tite.

The seal will probably leak anyway, but not as much. From what I've gathered, that's just what these T-cases do. Oh, flush and fill the T-case with fresh fluid while you're there. If it has a balance weight on it, the drain plug is under that (which are likely corroded in fairly well) to drain it. Anti-seize these bolts.

EDIT: it's handy to have a buddy standing by to put the trans in neutral or gear. Ideally the whole job would take about a half hour, but with all the possible complications, keep your afternoon free, at least. Might want to consider doing the d-shaft slip joint (lubricating) at the same time for another half hour or so of labor. Somewhere on the forum ADSM did a little bit on the proper lubricant, it's a teflon base IIRC.

 

[4x4junkie]

It's possible it could be leaking through the shaft splines too (I recall there's a seal just behind the flange nut that goes around the output shaft threads). If the nut is loose at all it can leak through there as well.

And no, leaking is definitely not "just what these t-cases do", it just means there's a problem with a seal somewhere.