rear transmission to transfer case gasket

[BUDDY]

So I went for a night run on saturday night & now I'm leaking transmission fluid. It seems to be coming from the back of the adapter & is dripping down the mount off the front of the cross member. My questions is how hard is it to change out that gasket.

I'm pretty sure that I know what all is involved, but just wanted to check in with others that may have a little more experience in doing this repair.

BTW - 1990 blazer stock drivetrain (700r4/np241)

Thanks in advance,

Buddy

 

[4xcrazy]

i just used RTV, and i'm pretty sure alot if not most of the peeps on here will say the same thing.

just make sure it's really clean, brake clean, clean, alittle RTV between the two, and tighten it back up, don't go tossin a big huge bead on it either, just enough for a decent seal without all the squishyness goin on.

 

[BUDDY]

That's what I thought.

Thinking about a sye while I've got it all down & out, JB super shortie. Would I need to have my rear driveshaft replaced, lengthened?

Thanks,
Buddy

 

[Russell]

I've had trouble running just RTV, or just a gasket between the transfercase and transmission. Doesn't seem to matter how tight you make those bolts, the transfercase moves around and it starts leaking.

I always use a combination of a new gasket (either purchased, or made from a cereal box) and RTV now, haven't had any trouble since.

 

[bp71k5]

I'm another one of those who can't get a RTV gasket to seal well. I like a new gasket with a skin coat of rtv on both sides.

 

[84zz4ss]

New gasket on a clean surface with a smear of ftv on each side.

For the driveshaft with the SYE you will need the shaft with a slip spline built. The length will change as well. You may want to upgrade to a 1350 shaft or go all the way and get 1410.

 

[496truck]

I was under the impression that area was to be dry. The seal was there to keep contaminants OUT rather than fluid IN. If the trans tail shaft seal is faulty that area will fill with fluid, same with the t-case front seal. I could be wrong...

 

[4xcrazy]

There is no trans tailshaft seal in there, in fact there is a small drain type hole in the rear lower area of the tailshaft housing, pull them apart and fluid comes out.

 

[496truck]

Now I know. Thanx!

 

[wasted wages]

while you have it apart,,,,clean the sealing surfaces extremely clean and inspect the case for cracks...use a flashlight and a mirror if you have to..take a good close look..a cracked case will leak fluid just like a gasket surface leak every time...

and ain't no amount of JB weld or RTV gonna fix a cracked transmission case or transfer case....

how do I know ? I've broken more transmission cases that I care to remember...

 

[G.M.H]

I am going through this right now. All the bolts connecting the trans-adapter to the NP203/205 were loose, and it would leak trans fluid big-time just sitting in the garage. I got some hardened studs from a machinist buddy and tightened them into the T/C with red locktite. Three of the holes go through into the interior of the T/C, so I had to shorten the studs so as not to interfere with the gears inside. I put a small 0-Ring over these 3-studs. (maybe not neccessary as it never leaked gearlube, only trans fluid) I have made a new gasket and will install it with a thin coat of RTV on each side. I am then going to re-install the T/C using self-locking nuts. That should fix it once-and-for-all, cause I DO NOT want to have to pull it again!
P.S. I have modified my floor jack with bracketry to support the unit to ease installation, and just in case...

 

[phreddei166]

G.M.H. (P.S. I have modified my floor jack with bracketry to support the unit to ease installation, and just in case...)[/quote]
Hows-a-bout a pic or 3 of floor jack mods ? Thanks !

 

[G.M.H]

 

[G.M.H]

It's actually a modified transmission adapter. It's bolted loosely to the jack so it can't fall off, yet it flops around a bit to make alignment easier.