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4 Wheel Drive/SUVs/98 Blazer 4x4 issue

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Expert: - 12/12/2010


Question
I just changed my transfer case motor for my 4x4 and
everything seemed to be working fine.  It would shift 2hi to
4hi and back.  Only problem is now is that my front drive
shaft is not disengaging from 4hi even though my button says
2hi.  I have no idea what to even do about this, not sure
how to search the problem online.  All I know is that my
motor was bad, I put a used one in and works, just something
isn't working right.  Any ideas are welcome to give me a
clue to check.  Thank You.

Answer
Jamie,
If I'm not mistaken, you have a vacuum actuator on your front differential.  You may have a bad vacuum line or actuator that's not letting the front end disengage.

You can purchase a repair manual from most auto parts stores for, around $20 or so.  These are great for repair or trouble shooting, as they have diagrams and step by step instructions for replacement or repair.  Pick up one of these, and it may be well worth it.

I'm assuming that you replaced the transfer case motor/encoder.  You may need to check out the wiring harness and make sure that all the connections are good, and that you don't have a bad ground.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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