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T/case Oil leak

Posted: Wed Oct 29, 2008 10:18 pm
by lockdup
Hi guys,
Done a quick search but way to many results to look at em all, and didnt really find an answer.

My 88 wt sierra has a slight leak in the t/case. I read a thread a few weeks ago on what oil and where to top it up from but cant find it. And does anyone know what seal is gone and how hard it is to replace?]

Cheers

Posted: Wed Oct 29, 2008 11:06 pm
by Adsport
the top up and drain points are visible looking from the passenger side at the case, they are a bung with a square hole that a 3/8 ratchet fits straight into.

image stolen from another thread !

Image

you can see them both there on the right hand side, the drain is at the bottom facing downwards and the filler is on the side just under where the 4 bolts are !

Posted: Thu Oct 30, 2008 6:16 am
by lump_a_charcoal
Hey I recognise that crossmember and Tcase...

Basically the most comon places for leaks are the input shaft seal, and output shaft seals... Fairly easy to replace too. Seals are about $5 each.

Posted: Thu Oct 30, 2008 9:29 am
by ofr57
lump_a_charcoal wrote:Hey I recognise that crossmember and Tcase...

Basically the most comon places for leaks are the input shaft seal, and output shaft seals... Fairly easy to replace too. Seals are about $5 each.
I gotta change an output shaft seal soon ... can i get away with doing it while the chase is still bolted in?

Posted: Thu Oct 30, 2008 9:33 am
by lump_a_charcoal
Should be able to, but if the shafts are worn too then it can help to linish them lightly as well, so it seals nicely...

located the problem.... i think??

Posted: Fri Nov 07, 2008 12:10 pm
by lockdup
Ok, so after a couple of weeks of not doing much on the car due to Uni Exams im Back to it.
Ive located the problem and taken a few pictures. I gave the case a small wipe to make it more clear.
Image It seems to be the input shaft??? The ... .jpg[/img]

Sorry about the bad picture quality.
My question is how hard is it to replace or will it be costly? I read on another threat that the driveshaft angles might be to great due to SOA but it seems to be ok. Ive attacted a pic of the suspension setup.


Image Its a SOA on stock springs also has b ... Cheers Sin

Posted: Fri Nov 07, 2008 12:19 pm
by Gwagensteve
Looks like the input shaft seal?

All transfer seals can legitimately be replaced with the case still assembled. The Factory manual even tells you you can.

I have to do my rear output some time soon...

Steve.