Question about 1994 Chevrolet S-10 Blazer

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Vacume line from front diff shift pod under battery box to where

Where facume line from shift pod under battery box go

Posted by Anonymous on

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Posted on Jan 02, 2017

Molson02536
  • 3854 Answers

SOURCE: Front diff. wont lock into 4x4. Transfer case

The cable from the differential to the accumulator should move somewhat freely. If it does not, then the cable may be froze up. You can lubricate it with some penetrating oil and work it to free it back up. You may have to remove it to free it up properly.You may find the cable shield towards the bottom end is broke off and the cable may completely be froze up, it's common on the Blazers. You can try pulling on the rod that the cable clips into in the front diff to disengage the front axle. If you cannot get it to engage that way, then you will likely have to pull off the passenger side extension housing to access the engagement collar and fork. If you cannot get it to engage by pulling on the fork in the axle, then you will likely have to disassemble it.

You will likely have to file down the leading edge of the gears. They should be beveled on the sides of the spline to aid in engagement. Hopefully yours is not chipped like the one in the front of my old S10. Mine chipped the splines on the axle and split the collar from being partially engaged under power

The right axle and has splines at the end of it. The Output Shaft slides into the carrier and has large teeth on the other end. The collar it has large teeth inside it that mate with the Output Shaft with the Fork.

The collar rests on the axle, the fork wraps around the collar. Then you push the 4x4 button or shift your transfer case into 4x4 it starts spinning the front drive shaft, which spins the carrier and the short shaft. Now your in 4x4, BUT the front axle needs to lock the right axle with the carrier. A switch on the transfer case routes engine vacuum to a diaphragm under the battery tray, that diaphragm pulls a cable which pulls the collar and forces it over the short shaft. Now your front diff is locked. When you take it out of 4x4 the vacuum switch closes and a spring pushes the fork and collar off the shaft unlocking the front diff.

The problem with mine I think is that the large teeth on the Output Shaft and the inside of the collar are worn at the tips, not allowing them to join together, and the more I drove it around with it clicking, thinking it would lock eventually it just wore the tip of the teeth more.

If that is the problem, You should not have to mess with the differential case. You should be able to get the passenger axle extension tube off, but it may require popping a ball joint, then disconnecting the CV shaft from the axle extension tube, which would allow you to then pull the extension tube.

Good luck and hope it's just the shift cable retaining clip in the housing that broke.

Posted on Dec 30, 2009

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My 1985 chev blazer will not engage the front drive axel. I had the transmission replaced and i now have unconnected vaccume lines around transfer case/transmission area. Is there a valve or something...


if the light for 4wd does not come on it could be that a vacume line has cracked or become seperated from the ball under your battery listen under hood for a hiss, my hisses usually come from somewhere around the heater box where the lines join together on the way to the ball or the vacume ball may be bad the front wheels will not enguage without vacume applied as vacume pulls the locks in. The xfer case is working if it turns the short driveshaft

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there is a vacum maudual that screw's into the transmission were those three vacume lines connect,a little ball inside there moves up and down to controle the vacume ingageing and disengageing the 4 wheel, i had the same problem,replaced it and wooks great, you will have to go through a chevy dealer to get the part tho, auto-stores don't carry it. good luck

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I have a 1996 Dodge Ram 1500 quad cab 4x4. I have been in Iraq for 15 months, and now that I'm back I went out to test the truck out. when trying to switch into 4 high, nothing happens, no "jump",...


Most likly cause to your problem would be the transfer case vacume switch check for vacume at switch then check for vacume at the front differntal if you have vacume at switch but none at the front differntal then replace transfer case vacume switch if no vacume at switch look for broken vacume line at intake manifold

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that vacume line goes back to the transfer case, the end that goes behind the motor hooks to a steel tube so it does not get hot from the exhaust., my guess it should be hooked up so it will feed vacume to the vacume ball so it can lock in the axels. if you start the car and shift into 4 wheel drive and listen under hood you should hear a hissing sound, that is vacume, if you can't hear it there, you may have to craw under the right side to hear it, probably came unhooked underneith the car

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Vacume lines or vacume switch on transfer case,or vacume pod to front axle.

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Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

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