1992 S10 Blazer Transfer case - S-10 Forum
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1992 S10 Blazer Transfer case

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Old 05-16-2011, 08:57 AM   #1
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1992 S10 Blazer Transfer case

How do u engage 4wd on this 1992 that has a 5 speed? i dont see a lever next to the shifter or an electric button that looks associated with 4wd.
Old 05-16-2011, 10:45 AM   #2
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Re: 1992 S10 Blazer Transfer case

You don't engage 4x4 because if you dont see a lever you have bought yourself a 2wd Blazer
Old 05-16-2011, 11:15 AM   #3
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Re: 1992 S10 Blazer Transfer case

the blazer has a xfer case and front drive shaft so it's definitely a 4wd. are these blazers electrically engaged 4wd's?
Old 05-16-2011, 11:29 AM   #4
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Re: 1992 S10 Blazer Transfer case

Quote: Originally Posted by ecreek
the blazer has a xfer case and front drive shaft so it's definitely a 4wd. are these blazers electrically engaged 4wd's?
I have owned a 92, a few 94's and they all had levers. I am not sure exactly what year they started installing the button, I want to think it was an option starting in 94, I am 99% sure you should have a lever and a selector button was not available in 1992. Maybe someone did a body swap and decided 4x4 was not needed?
Old 05-17-2011, 08:06 AM   #5
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Re: 1992 S10 Blazer Transfer case

I had a '93 Sonoma 4x4 with a button.

Here's what it looked like
in the original brochure.
Old 05-18-2011, 08:02 AM   #6
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Re: 1992 S10 Blazer Transfer case

i might (probably) have the year wrong. there's a push button with red and green LED's to the left of steering wheel/upper dash. could this be the the 4wd activator?
Old 05-18-2011, 08:06 AM   #7
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Re: 1992 S10 Blazer Transfer case

the markings are faded so i cant tell just by looking at it.
Old 05-18-2011, 01:20 PM   #8
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Re: 1992 S10 Blazer Transfer case

Quote: Originally Posted by ecreek
i might (probably) have the year wrong. there's a push button with red and green LED's to the left of steering wheel/upper dash. could this be the the 4wd activator?
Yes, this is it.
Old 05-18-2011, 09:07 PM   #9
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Re: 1992 S10 Blazer Transfer case

ok if i push the button, i can grind away at terra firma right aa21830?
Old 05-18-2011, 11:18 PM   #10
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Re: 1992 S10 Blazer Transfer case

Yes, the top part of the switch is 4H and lower part is 4L. If the LED's are working, you would see green light up (I think) when you hit 4H and yellow for 4L. Both are basically toggle switches...push 4H to engage 4WD; push it again to go back to 2WD.

If everything else is working (transfer case shift motor, front hub vacuum actuator, etc), you'll have 4WD when you push the button.
Old 05-19-2011, 10:06 AM   #11
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Re: 1992 S10 Blazer Transfer case

i'll fire up the heap & try it out today. thanks for the useful info.
Old 05-21-2011, 10:35 AM   #12
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Re: 1992 S10 Blazer Transfer case

tried it...neither led didnt lit up...ne1 got a vac/elec diagram? or what do you think i should chk 1st?
Old 05-21-2011, 03:13 PM   #13
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Re: 1992 S10 Blazer Transfer case

Not sure if the 1st gen system is the same as 2nd gen (although I suspect it's similar), but on 2nd gen trucks, common 4WD problems are:

1) Bad vacuum lines to the t-case vacuum switch, and/or the lines from the switch to the hub locker vacuum actuator.

2) Bad vacuum actuator. This is the actuator that pulls a cable that locks the front hub (under the battery try on 2nd gen's). It can go bad due to age, or because of a faulty t-case vacuum switch that is letting ATF into the vacuum lines and into the actuator.

3) Bad transfer case shift motor. No shifty = no 4WD.

4) Seized hub locker cable. Sometimes all of the above are fine, but the cable won't budge.

Even if the LED's don't light up, you should still hear that distintive "thump" when the t-case shift motor engages, and/or the hub lock cable engages (sometimes the LED's don't light up because they are burned out...I've replaced the 4H LED on my '96 Sonoma twice).

Hope that helps.
Old 05-21-2011, 08:55 PM   #14
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Re: 1992 S10 Blazer Transfer case

i'll start checking the items. how do u get the switch out of the dash to check the leds?
Old 05-21-2011, 09:03 PM   #15
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Re: 1992 S10 Blazer Transfer case

and you do know that this is the 2nd gen forum right? You have a 92 so either way its a 1st gen
Old 05-22-2011, 10:25 AM   #16
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Re: 1992 S10 Blazer Transfer case

uh oh i didnt even know there were 1st & 2nd gen's
Old 08-15-2013, 05:41 PM   #17
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Re: 1992 S10 Blazer Transfer case problem...

Bought a 1992 S10 4X4 pickup. Was told the automatic transmission was bad but the transfer case was rebuilt. Had tranny rebuilt. Truck goes in gear and drives. It has the 4 lo, 4 hi switch on the dash and it will go into each setting. While driving in 4Hi it acts like it pops out of gear and sounds like grinding gears. Let off the gas and it acts like it goes back in gear for a short period of time. It is doing this in all transmission gears (OD, D, 2 and L). It seems to be a transfer case issue not transmission. Has anyone experienced this and possible solutions to this problem? Haven't dealt with a transfer case since a 79 Jeep.
Old 08-15-2013, 08:27 PM   #18
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Re: 1992 S10 Blazer Transfer case

Sounds like your 4WD vacuum switch is faulty or at a minimum you are loosing vacuam to the actuator, if the seal is bad between the transmission and the t fer case the t fer case overfills with oil, then fills the switch supplying vacaum to the 4WD actuator, best way to test it is to run a vacuam line direct to the actuator on the RF inner fender area , see if it stays in 4WD then.

That is what happened to my 1990, it made the same noises you describe also.

Good luck,Mike
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