Hi,

I have Blazer 96 LS.
When i try to reverse - it slips. When i try to acelerate - nothing happened and when the rpm lowred then car starts moving a little.
All the forward gears works fine. ("OD" and "D" - i didn't try "1" and "2")
Yesturday i counted all 4 gears on OD.

The reverse light wont lit up. - the bulb is all right but no elecricity.





Reacently i had problems with gearbox vent. The pipe was pent and no air could get through. So when i stoped the engine - most of the oil came out from the "tube you check the oil level". R, D nor OD didnt work.

I found the pent pipe and poured 4L of oil in it. everything started to work.





My gearhead friend sugsested that when the oil came out - the oil pump scraped all the dirt from the gearbox and pushed in the oil filter.

 

There isn't a bypass around the filter for the transmission so you didn't pull in any dirt/debris from the bottom of the pan. Your condition was caused by the lack of fluid in the transmission. Fluid is required to actuate the bands/clutches/etc inside the transmission to get things to move.

The transmission vent is not in the engine bay. On your transmission, it is a very short tube off the top of the transmission about a foot away from the back of the engine.

If you can snap a picture of the 'vent' you are speaking of, we'll try to diagnose the loss of fluid.

Also, how did you come to determine that 4L was the proper amount of fluid to refill the transmission? Did you pour the fluid down the transmission dipstick tube?

In all of this I keep saying 'fluid' and not 'oil' because transmission fluid is quite specific. I hope you used Dexron III or newer/equivalent fluid.

 

one day after reading your post - i pour one more liter of fluid in the transmission - now it shows that fluid level is waaaaaay over limit. leather that day the fluid was coming from the dipstick tube :S

i pour 4 liters and in the mean time checked fluid level. I pour it from the dipstick (if it is the tube where i check the transmission fluid level)

today I looked my transmission again. i think i haven't found the transmission vent

I found - i think it is a vacum tube. One end is connected to the top of the transmission - then there were y joint and the other two tubes went to torque converter???(The "gearbox" that makes 4wd)

with those tubes were 2 more tubes that went from "4dw box" to somewhere to the engine bay.

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Ok - i checked once more.
the "vacum" tube i found was coming from about a foot from engine on top of the transmission.
it should be the transmission vent - but why is it connected to the y joint and the "4wd box"
and i cant find any other tube coming from the transmission :S

 

Sounds like it has been connected to the vent from the transfer case. This isn't typical, but shouldn't hurt anything. It should run up to a capped line right next to the dipstick tube for the transmission under the hood.

A typical pan drop will drain out about 6-7qts (5.7-6.6L). The engine must be running to check the fluid level in the transmission.

 

This is what i found:

Red pipe was connected to the long blue pipe.
Blue pipe was connected to the Y joint and this was connected to the two green pipes.
Purple pipes wer connected to the transfare case along woth the one green pipe.

I think that blue pipe shouldnt be connected to the red pipe.
Red pipe souldnt be connected to anything - and blue should be connected to y joint and somewere near the dipstick? - but where is this somewere???

Am i right?

And what are those two purple pipes?

 

That blue hose should go up and be literally zip tied to the dip stick tube under the hood.

The other two lines are a vacuum source from the engine and the vacuum line running to the front axle engagement actuator.

For vacuum diagrams, take a look through the 4wd threads in the Tech Article (DIY) section.

 

By zip tied to the dip stick you mean just side by side tied together - or should there be some tube it haveto be connected to?

 

And again the transmission fluid started to come out from the dipstick tube.
Now i disconnected the red pipe from the two green pipes.
Still the reverse is slipping but fluid levelt whent down. I dont know, maybe the transmission fluid is lo.
but in a few days i will cheack that.

 

The vent line from the transfer case shouldn't be connected to anything up by the dipstick tube. It should be just zip tied to the dipstick tube.

So where is the fluid coming from again? The first time it sounded like it was coming from this vent line. Is it now coming out of the dipstick tube??

 

The transmission fluid was coming from dipstick tube.
the transmission vent and the transfare case vent lines were connected :S - i dont know why. When i disconnected them the pressure disapeared from the transmission and no more fluid was coming from dipstick tube.

Now i have no reverse. - at the begenning it was slipping - but now it seems to slip so much that no point to try.

All the farward gears work perfectly.

fluid level was OK.

Im afraid the only solution is workshop and lots and lots of money