Bronco II slips out of 4WD at a a bump or suddden accelleration
It never feels like it locks into 4-H. A light push of the shifter will push it out of 4wd. It is obvious that the wheels don't grab in the snow when it slips out. The 4x4 light goes out. Speed is 10 to 20 MPH. Anyone else experienced the problem? Thanks a Mill. JERRY
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There are a number of different hub systems so this may not work but it has worked for me on both auto and manual locking hubs. On a flat surface without traffic. Put the trans into neutral, shift the transfer case into 4x4, shift the trans into reverse and back the truck up 15-20 feet. Completely stop and shift trans into drive. See if this has locked the hubs in. If not, you can also try following the same instructions except shifting into 4wd low. Sometimes the hubs need a "bump" to get them to slip into place. Keep In mind that if the 4 wd low select works, you need to shift it back into 4 wd high before continuing! When taking the truck out of 4wd to 2wd, I recommend the same, shift to neutral, select 2wd, back truck up, shift back to drive and check. Its entirely possible that your hubs need maintenance (they're often overlooked) but hopefully this will get you going. Please let me know if thus worked or if I can offer other suggestions. Good luck!
You didn't specify which vehicle model you have, but most gm vehicles use vacuum to activate the 4wd system. Check all the vacuum lines you can locate for loose or disconnected line, cracked or gummy feeling lines. If you have the push button 4wd, listen for an audible click when you push the 4wd button. If you don't hear anything, the push button assembly may need replacing. If you did hear the click, then look under the battery tray for a loose vacuum line. Most gm 4wd problems are vacuum related.
Has this Jeep been modified at all? It sounds like the shifter cable was reinstalled backwards.
Specifically the 4-Low "Not Climbing Well". 4-Low should give you the best torque and hill climbing ability.
Do you feel any "Binding" in the steering wheel (difficult to turn)?
Remember a Jeep uses real driveshafts and differentials to give you 4WD - you cannot engage 4WD or 4-Low on dry hard surfaces. It needs a little bit of slip between the wheels for turns.
Check you're fluids too.
The sound is not coming from the glove compartment, it is coming from the panel behind the drivers seat, that's where the relays and computer are located. The relays click and apply power to a transfer case motor. The motor attempts to turn a shaft that engages the front drive shaft. When the computer thinks the shaft has NOT turned it tries again. It will try three times then quit, figuring the shaft has not turned.
Get someone to crawl under the vehicle and engage the 4WD (just turn on the ignition- do not start the engine) See if they can hear the motor attempt to turn the shaft, it will make a clicking sound. If not the connections or the motor may be bad.
I have found the most probable cause is the relays on the control board. If you are technically adept -- you can remove the small side panel from behind the drivers seat and remove the control board. (remove the power plugs first) Clean the relay contacts and bend them a little to give them more 'wipe' to keep them clean longer. Put it back in and turn on the ignition. Then push the RESET button on the side of the board. Try the in / out 4WD a couple of times. If it doesn't work turn off the ignition, turn it back on and push the reset button again.