about a week ago, i noticed smoke from under the hood while driving. I stopped and looked and seen nothing wrong but the smoke smelled like trans fluid. So I started driving again and then when i got home i took a closer look and seen the fluid was coming out of the breather tube located next to the dipstick tube. I can see the fluid flying out since there was no breather cap on it.

So im wondering now, what could cause this problem? Is this due to my transmission overheating severly or just telling me it's time to change my filter?

If it is my trans overheating, whats the fix to that? Should I get a trans cooler for it?

 

was it overfilled?

 

I had a outer seal in my transfercase go bad, letting fluid from the transmission get into the transfercase. This situation overfilled my transfercase and the extra trans fluid blew out the breather hose of the Transfercase.
I had to remove the transfercase from the rear of the transmission and replace the seal.
It was not fun, especially lifting the transfercase back into place by myself.
I had to clean all the vacuum lines out because tranny fluid got sucked up in them.
Pull the dipstick on the transmission and check the level. If it is really low, they may be a problem.The quickest way to tell if this happened is to remove the fill plug on the rear of the transfercase(the top plug, not the bottom plug) and see if alot of fluid comes out.None should really come out, maybe a little drip or two, Not a gusher.If it does, the seal needs replaced.
Almost 2 quarts of of fluid gushed out of mine.
I do not know if you blazer is set up the same as mine, a 1994, and your problem may be from a different reason.

I said all of this just in case it is a worst case scenerio.
I hope it is something else causing the prob.
What were you doing,could it be overfilled, were you towing something, was it really hot out, were you running/driving it really hard, were you off roading at steep angles or rough road. All these could cause fluid to blow out.

 

x2 on the transmission input seal. That vent is for the transfer case. Pull the upper plug on the back of the t-case. If fluid pours out, your input seal is bad. The next problem you may be facing is transmission fluid sucked into the vacuum system. This can migrate as far as the HVAC controls which can be a major pain to clean out!

 

ahh crap. well ill get a look at it tmw then since its like 11-pm already n i dont have a garage therefore no light to see. but im really hoping its not the seal. >.>

after looking at autozone, at least it'll be a cheap fix for the seal.

Little more detail, i am pretty sure i had it over filled, cuz for 2 days straight i was pouring trans fluid into it, but only because it didnt want to shift and the fluid was low. The final time i put trans fluid in, i put 2 quarts instead of just 1 cuz my dipstick was bone dry. And a few days later iss when the smoke started happening. So whatcha think, t-case seal still? Abd does anyone know if this seal is a dual lip seal or just a reg seal? cuz autozone has two type, dual lip and a solid seal.

 

well thanks you guys for letting me know. i pulled that plug n bout half a quart shot out at me. I changed the filter and fluid (cuz i thought i did have it overfilled) and it was fine for a couple days, until today i noticed a puddle about 3 inches wide on the ground at the gas station and when i looked under i seen it just dripping down. So i got it home and pulled that plug again and bam out shot at least 2 or 3 quarts of trans fluid right at me. So tomorrow i know what i'll be doing.. changing a input seal..

Any tips? Oh and before i get there and look like a retard, im asking for a input seal?

 

Bummer,Tell them its the transfer case input seal. You can do it with a basic floor jack and basic tools. A friend to help would be a plus, especially lifting it back into place. I grunted mine in by myself. A seal puller would be good and a seal driver/installer would be good also. I had neither at the time. I had to use a screwdriver and a dent puller, converted into a hammer wrench, and carefully remove the old seal. To install the new seal, I used a piece of pipe, the same diameter as the seal. Then, with a hammer, tapped the new seal into place.

 

awesome! i dont know bout transfer cases or 4x4 stuff. i mostly just worked on motor stuff in cars. So this is all new to me and i apologise for having so many questions bout it.

Me and my brother are going to ge tit done tomorrow afternoon when he gets out of work. he said it should only take a couple hour and im hoping it does. I already got the fluid, getting the seal tomorrow since AZ said they were out but getting truck in tomorrow. SO hopefully all goes as planned and this fixes my problem. Once i get the case out im going to examine it for cracks though just to be safe.

Should i change the tailshaft seal as well? Does it even have a tail shaft seal? I seen a vid on youtube about it, thats why i ask.

The seal install i seen a vid on youtube where the guy just used a wooden block with a hole cut out in the middle, then tapped the seal into place with it. So if my brother dont have a seal installer im going to try that technique. just have to tap tap tap it in there, no muscle bangs for this.

 

The tail housing does have a seal. If it is not leaking, you do not need to replace it. The piece of wood trick should do it, but the important thing is to get it started evenly or you may ruin the new seal and yes, light taps to get it into place and seated correctly.
Check all the vaccum lines for fluid. Follow all the hoses from the T case up into your engine compartment and pull them off where you can and see if there is fluid in them. I used a air hose and fitting and blew air through them to clean them out. Hopefully no large amount of ATF got into the vacuum relays and/or switches in your dash.
I used up the full day changing my Tcase seal out and cleaning the vacuum and vent lines.

 

The input seal on the transfer case IS the output seal on the tailhousing of the transmission. There is no other seal. Use RTV to seal up the faces on the adapter.

BTW, please keep questions on the forum. That way you don't have to wait on one person for a response.