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Old 07-22-2017, 09:25 PM   #1
Bryan59EC
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98 K1500 manual trans--no 4x4

Some time ago--two years maybe, I had to replace the transfer case on my pickup.

All was good until about 2 months ago when I needed the 4x4 it did not work.

Changed the actuator and it worked just fine----once

Fast forward to today -- again---no 4x4 engagement

Fuse good----cannot hear actuator with key on and going thru the ranges

Change TC switch---no change

plug wiring into removed switch and the actuator engages (I think)

Remove actuator plug harness to actuator key on
depress TC switch and actuator retracts----release and the actuator extends.

replace actuator----plug TC into loose switch actuator makes noise.
Start truck put into 4-lo and go out to my yard to try to climb a some sand.

Bury the truck-----the ranges seem to be working but I really have no way
of seeing if the transfer case is actually engaging the front driveshaft.

Is it possible that some shifting mechanism has broken inside the TC.

Sticking my finger inside the TC switch hole, it feels like the pawl is a bit off center----I did not think to see if it actually moved out of the way when in 4wd.

Or did something wig out in the differential---not sure.

Any ideas???
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Old 07-22-2017, 11:06 PM   #2
andrewmp6
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Re: 98 K1500 manual trans--no 4x4

You could pull the rear driveshaft shift it in to 4 wheel low or high and see if the truck will pull at all.Or put it on 4 jack stands and shift it in 4 wheel and see if the front wheels turn or not.
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Old 07-23-2017, 06:01 AM   #3
Bigdav160
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Re: 98 K1500 manual trans--no 4x4

Push button or lever?
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Old 07-23-2017, 07:07 AM   #4
special-K
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Re: 98 K1500 manual trans--no 4x4

Looks like button switch. I guess it's possible your TC has a problem, but I suspect a connection or other. Need to wrap my head around it a while.
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Old 07-23-2017, 09:44 AM   #5
Bryan59EC
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Re: 98 K1500 manual trans--no 4x4

all manual

big levers sticking out of the floor for both the trans and the transfer case.
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Old 07-23-2017, 11:49 AM   #6
Ol Blue K20
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Re: 98 K1500 manual trans--no 4x4

What about the front diff actuator? I've replace mine twice. The transfer went into 4wd but the front diff didn't lock in.
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Old 07-30-2017, 03:33 PM   #7
Bryan59EC
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Re: 98 K1500 manual trans--no 4x4

Actuator has been in there less than a month --- and it does function when I remove the switch from the TC and work it manually (actuator out of axle).

But something dawned on me just recently-----seems all the drawings I see of the TC/Acuator circuit have a relay somewhere----I have no idea where it would be or even if the manual trans/manual transfercase vehicles even have one.

No time to play with it last week or even this upcoming week as it needs to drivable to the airport (where it pretty much lives)

Should be working in my hometown after the 8th for a few days so I might get somewhere with it.

Would really like to--the brush piles need to be consolidated into a single pile for burning and I ain't about to go back there again without the 4x4 working.
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