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4 Wheel Drive/SUVs/2000 Oldsmobile bravada

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QUESTION: It has smartrac but my 44 isn't working back tires spin but front doesn't even try got it stuck &service and light came on but didn't stay on &now keeps blowing act fuse under hood any ideas plz help

ANSWER: Patrick,

The computer controlled NP-136 transfer case uses two speed sensors to sense the difference in speed between the front output shaft and the rear output shaft, and engages the front axle accordingly. These trucks use an "Active On Demand" transfer case. Basically its a normal 4x4 transfer case with a big electrically actuated (by way of a motor) clutch that connects the front prop-shaft (which is being spun by the wheels full time) to the transfer case front output. Its all in the transfer case. I'd check all the fuses and the wire harness to the encoder motor and replace the encoder motor if it has gone bad. It could also be one of the speed sensors is not working and not engaging the AWD. Did you have the PCM scanned for trouble codes? 9 times out of 10 it is the encoder motor.

Carl

---------- FOLLOW-UP ----------

QUESTION: Hey thanks yeah I had it scanned scanner said couldnt communicate with system which made me think beens it was blowing fuses maybe it is actuater on transfercase

Answer
Patrick,
Wow, sorry about the scanner.  Not sure what is going on, but I would be tempted to go to another shop to have it scanned.  
Other than that, you might consider getting a repair manual at your local auto parts store.  They are not real expensive, and have great information on troubleshooting that you can do yourself.

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, and I suggest that you obtain a repair manual for mechanical problems and do some research before asking your question. Most mechanical questions can't be answered completely without looking at, or listening to the vehicle in person.

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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