Question about 1992 GMC Sierra

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4x4 light does not come on when shifted into 4WD, transfer works but dont think hubs lock?

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Very common for the vac, actuator on the frt. diff. to go bad..

Posted on Dec 13, 2009

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I have a 2006 f350. Ford will not go into 4wheel


Which 4X4 system does yours have ?
Four-Wheel Drive Systems The mechanical-shift 4-wheel drive system consists of the following components:
  • Transfer case (For transfer case repair procedures, refer to Section 308-07B ).
  • Transfer case shift lever
  • Manual locking hubs
  • 4x4 indicators
  • Shift linkage (hub locks)
The electronic-shift, 4-wheel drive system consists of the following components:
  • Transfer case (For transfer case repair procedures, refer to Section 308-07B ).
  • Four-wheel drive (4WD) control module (For 4WD control module installation, refer to 4WD control module in this section.)
  • Mode select switch (MSS)
  • Gearmotor encoder assembly
  • Automatic locking hubs (hub locks)
  • Pulse vacuum hub lock (PVH) solenoid and vacuum lines

Jan 11, 2018 | Ford Cars & Trucks

1 Answer

2OO9SIVERADO 1500W/T 4X4 WHY DONT FRONT HUBS ENGAGE


Automatic transmission or manual ? Which Transfer case does it have ?
Transfer Case - BW 4485-NR3
Transfer Case - MP 1222/1225/1226-NQG
Transfer Case - MP 1625/1626-NQF
Transfer Case - MP 3023/3024-NQH

Do you hear the transfer case lock the axles in ?
The Magna Powertrain (MP) 1625/1626 RPO NQF transfer case features a 3 mode shift control switch located on the instrument panel.

The Magna Powertrain (MP) 1222/1225/1226, RPO NQG transfer case is a 2-speed, part-time with mode shift-on-the-fly capability

Circuit/System Verification
Place the vehicle in 4WD install a scan tool and using engine data 2 look at the display for 4WD signal.
Verify that the scan tool indicates that the vehicle is in 4WD.
? If the scan tool indicates that the vehicle is in 2WD go to circuit system testing.

Your best bet , take your vehicle to a qualified repair shop !

Jan 31, 2017 | Cars & Trucks

3 Answers

Why doesn't my 4x4 work


Do you have mechanical-shift four wheel drive,or electronic-shift, 4WD system ? Any lights lit on the dash ?
The electronic-shift, 4WD system consists of the following components:
  • Transfer case (For transfer case repair procedures, refer to Section 308-07B ).
  • 4WD control module (For 4WD control module installation, refer to 4WD control module in this section.)
  • Mode select switch (MSS)
  • Gearmotor encoder assembly
  • Automatic locking hubs (hub locks)
  • Pulse vacuum hub lock (PVH) solenoid and vacuum lines
  • The mechanical-shift four wheel drive (4WD) system consists of the following components:
  • Transfer case (For transfer case repair procedures, refer to Section 308-07B ).
  • Transfer case shift lever
  • Manual locking hubs
  • 4x4 indicators
  • Shift linkage (hub locks)

Dec 12, 2014 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

4x4 K1500 Chevy Truck, 4 wheel drive repair instructions


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!

Jan 18, 2012 | Chevrolet 1500 Cars & Trucks

1 Answer

99 kia sportage 4wd doesn't work so i install the manual warn hubs on. car still doesn't work in 4wd mode. But when i shift it down to 4wd mode now it makes a weird noise from back bottom of car,...


dont worry about vac hoses as they are redundant with manual lock. i changed to manual and all fine so definately back differential or transfer case

Aug 10, 2011 | 1999 Kia Sportage

2 Answers

Front end will not lock in in 4x4 transfer case is in & dash lite shows 4x4 but front wheels don;t lock in


Ok, this is probably going to sound greek if you have no automotive experiance, so here goes:

There are 2 possibilities I can think of at the moment depending on your 4wd system, however there are several things that can cause this

If you have a Push button 4wd (you push a button or turn a knob) the system engages using actuators or sylinoids meening you turn the 4wd on, the switch sends power to the selector option (high and low) and the 4wd light on the dash. the selector determines where the actuator/silenoid engages (either high or low) in the transfer case. However the actuator or silenoid can be faulty and yet the system will say 4wd is on because the switches still sending power to the 4x4 light

The next setup is the manual linkage set up, and given the year of your kia I doubt you have this setup However I am going to go through it anyway.

With a maual linkage setup you engage the trasfer case maualy using the 4wd shifter. Ironically on newer manual shift 4wd systems the dash light is still triggered electrically by location of the shifter not what is going on in the transfer case (Ah a flaw in the design) So if you linkage is loose/bent/damaged or somehow disconnected your 4wd wont engage but the light will still show that it is! Hope this helps

Jan 30, 2010 | 1999 Kia Sportage

1 Answer

Cant turn on 4wd


Have you checked if the problem is with the front hubs or with the transfer case ?
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc ).
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

Next with the truck running, have someone turn the switch to 4WD, and you should see the shift motor diaphragm move
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If not, could be the shift fork is stuck ( try manually moving ) or cold be a vacuum leak back to the vacuum shift solenoids
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You can remove the 4WD mode switch, and test the resistance on it ( this is also the vacuum line routing )
1d66749.jpg
You might find moisture in the vacuum shift motor diaphragm, not allowing the vacuum to operate it correctly.

Jan 07, 2010 | 1997 Ford F150 Regular Cab

1 Answer

How to shift into 4wd


Ford has 2 types of 4x4 system engagement. One is a knob on the dash that you just turn to 4wheel drive high or low. The other system is the 4x4 transfer case shift on the transmission tunnel (hump) between the driver and passenger seats. To shift into 4 wheel drive high while driving, just let off the gas and shift transfer case into 4H position, and continue driving. To shift into 4 wheel drive Low, stop the vehicle completely, put transmission in neutral, shift transfer case into 4Low position, put trans. in gear, and start driving. I am assuming before doing the above, you have locked in ( turned the front hubs to 4 wheel drive position.) Any further questions, let me know.

May 16, 2009 | 2003 Ford F150 Regular Cab

2 Answers

Tacoma 4x4 not engaging


Do you have all 4 tires matched to each other? If you have 1 worn and 3 new, expect problems. Also, 2 tires on the front from 1 mfgr and 2 on the rear from a different mfgr will cause no 4WD. If all 4 tires match, put it in 4WD and tap on the transfer case and the front shift mechanism on the front axle. One or the other may be stuck, assuming that the 4WD fuse is good. The fuse is in the fusebox under the dash.

Dec 29, 2008 | 1998 Toyota Tacoma

1 Answer

1994 22re 4x4 problem


your transfer case is not working properly, try this trick, shift into 4wd and gently back up the car and go forward and back up again wait for the indicator light to come back again, goodluck, otherwise you need to have those transfer case checked and maintained, have those front hubs checked and maintained too. Its would be better to use your 4WD more often. Try this trick not on a paved road pls.

Nov 25, 2008 | 1986 Toyota Pickup 4WD

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