tranfercase gasket for 79 k5

[jdmcay]

Unfortunatly the transmission in my 79 k5 went up on me.
i had no problems finding anthor transmission,but i am having problems finding the gasket that goes between the transfer case and the transmission.
Ive gone to every local parts store to try and find it, I've even gone to the Chevy Dealership to try and get it, But this is an discontinued item.
any one have any ideas on where i can find one.

 

[garydan]

I used RTV

 

[jdmcay]

did you have any spaceing issues? the original gasket it made of cork and is about an 1/8 in thick?

 

[garydan]

I just rubbed on a thick layer of RTV, let it rest for a bit... then tightened 'er down. No problems yet.

 

[72blazerguy]

You might try these guys

http://quad4x4.com/

I just bought some tcase gaskets from them that I couldn't get through the local parts houses.

 

[duanel]

This place also has alot of stuff you can not find at parts stores http://www.transtar1.com/default.asp and there might be a location near you

 

[garydan]

Did you look at lmctruck.com?

 

[diesel4me]

How about DTS..(Drive Train Specialties)??..

 

[4X4HIGH]

Since noone has asked yet, what t-case do you have? This makes a difference.

 

[jdmcay]

i couldnt tell you
its has a stock 350 turbo trans

 

[4X4HIGH]

i couldnt tell you
its has a stock 350 turbo trans

You need to ID the t-case. A TH350 had a NP203 and an NP205 mated to them in the ealry years and an NP208 mated to them in the later years. Don't assume that trans/t-case combo is factory for a 79 blazer since MANY people swap things over the years. The t-case adapter to t-case is different for each t-case i've mentioned. Take a pic of the t-case and post it so we can ID it for you if you aren't able to.

 

[wasted wages]

Just an FYI......and I can't stress this enough.....

The 4 bolts on the back of the T-350 that bolts the adapter for the transfer case should be upgraded to studs...

Now ...This is based upon my personal experiences so before I get flamed...please read on...

I have seen many T-350 failures at this point...mostly due to poor hardware being used to hold the adapter to the trans....The trans case has (4) 3/8" bolt holes,, that in a car do nothing more than hold the tailshaft housing in place. There is no load applied to the trans at this point,,, the housing basically holds the seal in place and has a slip yoke sleeve bearing for the driveshaft.

But in a 4x4,,, those 4 little bolts are under a LOT of load.
It is extremely important that good hardware is used,,,not a few old bolts you have laying around. I have seen transfer cases fall out due to crappy hardware, missing lock washers,,stripped holes etc.

I take a end tap and run it into the (4) 3/8" holes in the case to clean out all the junk and dirt from the threads....blow them clean and dry with shop air. If ANY of the 4 holes have stripped / pulled threads,,now is the time to helicoil them...not out on the trail 2 weeks later..

I then use (4) 3/8" grade 8 studs RED locktighted into the case.
I do not remember the length,, but a quick fit of the adapter plate will give an idea of how long the studs need to be.

When the transfer case is slipped into place,,I then use grade 8 flat washers,,,lock washers and nylock nuts on the four studs, torqued to spec.

overkill....maybe...but I have never had a failure using this method...
Spend a few bucks and do it right....you can thank me later !!!!

 

[Russell]

I usually make a gasket out of a cereal box.

Just lay it down over the t-case after cutting a hole in the middle for the input shaft, outline it with a sharpie and cut it out slightly oversize with a pair of sissors. Lay it back over the t-case and use a ball peen hammer to lightly tap the cardboard into a bolt hole on the t-case to get an outline, then cut it out. Put a bolt in and move on to the next one. After all the holes have been knocked out and have bolts in them, draw a circle to cut the inside out and use a sharp knife to trim the outside edges of the gasket.

I always install the gasket with some RTV on both sides and have never had a leak. The cardboard adds a bit of thickness and cushioning while the RTV solidifies the seal. I've never been able to get a good seal with just RTV before... After one wheeling trip I always wind up with a drip again unless I have some cardboard in there too.

 

[jdmcay]

i will definately post a pic of the transfercase once it is completly out.
I've sorrta been procrastonating on pulling this trans. im doing this job by myself and am not looking forward to lifting this trans.

 

[wasted wages]

im doing this job by myself and am not looking forward to lifting this trans.

Work smarter...not harder...

Rent a transmission jack......

Or build a cradle on a large floor jack....

Also...

Before you put the trans back in.....cut the heads off (2) 3/8 x 2" bolts....
take a hack saw and cut a slot in the end of the studs....away from the threads.

thread them into the lower two bellhousing bolt holes in the engine block.
They will act as a guide as you wrestle the trans into place...

start two bolts at the top of the engine,,,and pull the two guide studs back out...
use the slot with a flat blade screwdriver if needed to get them out.