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Old February 2nd, 2011, 11:15 PM   #1
giguy0079
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Default Jimmy 4x4 Problem

So i was on my last driveway today plowing, this huge A$$ storm. and when i put it (1989 S15 GMC JIMMY) in 4x4 and started moving, it seemed like the front wheels where not geting power, like the 4x4 was slipping, on-off-on-off then stay off.. any one have a problem like this?

I'm hoping its not big, i need to be ready for the next storm
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Old February 3rd, 2011, 06:36 AM   #2
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wow, thats really clean for an s-10 jimmy.

its most likely the 4x4 actuator.
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Old February 3rd, 2011, 06:55 AM   #3
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Vacuum switch on the t-case. Happens all the time.
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Old February 3rd, 2011, 07:19 AM   #4
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Vacuum switch on the t-case. Happens all the time.
My thoughts as well.

I had an 88p/u that acted up if its like mine pop the hood and on the passenger side fenderwell there is a round diaphram looking thing with a cable going to it. squish diaphram as much as possible extending the cable and use a small set of vice grips to keep the cable from going back in and walla 4wd.
just remember to take vice grips off to get bac to 2wd. I did this for 2 yrs with my s10. man that was a good little truck. except for the gutless 2.8l
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Old February 3rd, 2011, 12:19 PM   #5
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wow, thats really clean for an s-10 jimmy.

its most likely the 4x4 actuator.
thanks for the compelment, Its low miles too, for the year, 126,600 miles
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Old February 3rd, 2011, 02:12 PM   #6
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thanks for the compelment, Its low miles too, for the year, 126,600 miles
WOW!! that is low miles. my truck had 186000 on the od and the speedo was broke for a year when I quit driving it and that was 2002
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Old February 3rd, 2011, 03:26 PM   #7
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Want to sell it? I am looking for something like that...I don't need the plow though!
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Old February 3rd, 2011, 05:14 PM   #8
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couple things to check. if you put it in 4x4 and the diaphram doesn't compress to pull the cable.

1. vacuum source to switch. the little hose with the filter to the right of the distributor in the picture shows what it looks like. its very common they collapse over time and shut off. replace is soft and rubbery.

2. the hose plug being on the switch & or the lines being worn through on the way there. check for it.

3. the switch has to let a check ball fall down via spring pressure after you shift the case. tap the side of the switch and see if it shifts if you can't get one right away.

4. you can also hook a vacuum hose direct to the diaphram to shift the cable to the front axle side stepping the switch. makes a good short time fix
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Old February 3rd, 2011, 07:50 PM   #9
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My dad toke it to his shop today, to check it out, and he said it worked fine at first but then it slipped in 2wd, and a bit later was put in 4wd and its stuck now in 4 high.. Which in the end is better for me to plow in, till its fixed right
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Old February 3rd, 2011, 07:53 PM   #10
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WOW!! that is low miles. my truck had 186000 on the od and the speedo was broke for a year when I quit driving it and that was 2002
yeah the guy that we bought it from only plowed with it to do his 400ft drive. its been painted before, I'm thinking bout two-toning it red/white in the summer
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