Question about 1999 Chevrolet Silverado 1500

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My 97 z71 wont shift from 4wd back into 2wd - 1999 Chevrolet Silverado 1500

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Sometimes you have to reverse for it to kick out of four wheel drive. Make sure you put the truck into neutral before you switch out of four wheel drive into two wheel drive. If that doesn't work, your transmission might be sticking.

Posted on Jun 17, 2009

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My 2000 Chevy silverado 1500 z71 wont move. used 4wd then tried to put back into 2wd it would shift into any gear. Put back in park it makes a grinding noise


Sounds like your transfer case in neutral. You have to engage the transfer case back into gear then shift selector to drive or reverse. When your transfer is in neutral the transmission will not operate. Good luck.

Jan 04, 2015 | Cars & Trucks

1 Answer

2003 F-150 regular cab automatic transmission and the 4WD will not engage.


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).


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.

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
{ picture of shift motor }
-- If the vacuum shift motor does not move:
•Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
•Check the fuses for the 4WD system and the solenoids.
•Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
•Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
•Check the vacuum reservoir box for cracks.
•Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
•Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_111.jpg

- If the front drive shaft turns:
•For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
•For MSOF systems
-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

Jan 10, 2011 | 2003 Ford F150 Regular Cab

1 Answer

Can some explain the proper way to shift from 2wd


4wd auto: you can shift into this mode at anytime. it is good for conditions where you might need 4wd.
4wdhi:: you can shift into this at speeds up to 30mph and both of these back to 2wd while in gear.
4wd lo : stop vehicle and shift truck into nuetral ok to be rolling around 3mph shift into 4lo then put in gear same when shifting back to 2wd

Feb 19, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

04 Z71 4wd problems


can you hear the shifter motor trying 2 shift? if not its the shifter motor open the door and try 2 listen when your trying 2 shift it

Feb 13, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

2005 gmc sierra. Manual shift 4wd. After using


When you are finished with your 4 wheel drive,put the transmission in neutral, disengage 4 wheel drive and shift to reverse then back up a couple feet before shifting to forward gear.

Jan 15, 2010 | 2005 GMC Sierra

2 Answers

Stuck in Lo Range 4WD. Suggestions?


Try key in run position(without starting it) and try to shift it into 4wd high with the shift lever in neutral.

Apr 26, 2009 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

4X4 wont switch back to 2WD from Auto FourWD or Four


ok this is easy,put the truck in park and put your foot on the brake then push the button

Mar 12, 2009 | 1999 Chevrolet Blazer

2 Answers

Will not shift into 4wd low but will shift into 4wd high


it sounds like a transfer case problem in this case will have to get inspected

Jun 30, 2008 | 2007 Chevrolet Silverado 1500 2WD

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