Question about 2001 Chevrolet Silverado 1500

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Should the front drive shafts be turning when the truck is not in 4 wheel drive

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If your transfer case has an "auto 4wd" push button choice then the front shaft will turn all the time. This is due to how the transfer case is designed internally to provide that option.

Posted on Nov 02, 2010

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  • Chevrolet Master
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Yes they will turn as the FWD lock is in the differential unit

Posted on Nov 02, 2010

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Posted on Jan 02, 2017

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SOURCE: 1993 Chevy 1500 pickup 4-wheel drive

I replaced the malfunctioning “thermal actuator” with the “Warn” Vacuum actuator setup, it’s been working great for about 7 years now, simple install, if I remember correctly, it was about $150.
That’s what engages the front diff into 4wd.

Posted on Nov 25, 2008

  • 61 Answers

SOURCE: 95 blazer 4x4 4 wheel drive not working

There is a vacuum actuator mounted on the front differential that locks the shafts to engage four wheel drive.

Posted on Jan 29, 2009

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SOURCE: 4wd wont work on 1999 chevy tracker but front drive shaft is turning?

The locking hub control system is not engaging properly. On the 99 Tracker this is a compressed air system that consists of an air pump (compressor), electrical wiring to power and control the air pump, and air hoses that lead to an actuator inside the front differential housing. If there is a leak in the system the PCM will run the air pump for 10 seconds and then shut off, and your propeller shaft can turn all day long, but the front axles will remain free floating. Turn on your key, not your engine, and engage four wheel high. Go listen near the passenger front bumper for the air compressor. If you hear it, then the compressor control and the compressor itself are likely fine. If it shuts off after 10 secs or so, and your 4WD light isn’t on, the PCM timed out the compressor out and shut the compressor off to protect it. You will have to find the leak and fix it. If you are lucky, it’s the air line leading to the front differential; and not the air line inside the differential housing, or the air bladder in the locking actuator, which also resides inside the font diff. If the compressor shuts off and the 4WD light is on (this means the PCM did not shut the air compressor off due to timeout, so the pressure switch read 5-7 psi and the pump shut itself off), you likely don’t have a leak, and something mechanical has the actuator hung up inside the front differential. Lastly if you don't hear the compressor run at all, you either have a faulty compressor, or some sort of wiring problem in that circuit.....it could be as simple as a blown fuse. Good luck.

Posted on Oct 11, 2009

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Related Questions:

1 Answer

2002 1500 when you manually take the transfer case out of 4 wheel drive, is the front shaft suppose to turn freely


if you have free wheeling front hubs ---yes
if you have auto locking hubs --yes until the hubs lock up
if you do not have free wheeling front hubs ---no as the wheels will turn the drive shaft through the diff

Nov 26, 2016 | Cars & Trucks

1 Answer

New holland tc 40 4wheel drive not working.Drive shaft turns front wheels don't


check that the 4 wheel drive lever is in 4x4 application as the front diff will make the shaft turn when moving
if it is constant 4x4 drive , that leaves a problem in the center diff operation or a broken axle in the front end

Oct 01, 2016 | Cars & Trucks

1 Answer

Tractor case 585xl front diff not driving. Front shaft drives but not wheels.



I am thinking that you have a broken/ stripped drive spline on a front axle. If you have reduction gears in the hubs , it may be stripped teeth on a gear. If you jack up one front wheel and turn the drive shaft that wheel should turn. IF so repeat the procedure for the other wheel and if it doesn't turn like the other side then that is the side with the problem

Dec 17, 2014 | Cars & Trucks

2 Answers

Is the 4 wheel drive shaft supposed to turn freely


the shaft from the transfer case to the front differential should not turn free by hand because it is connected to the differential.

Oct 30, 2011 | 1991 Ford Explorer

1 Answer

I have a 93 sub with 4 wheel drive. front drive shaft truns all


Yes the front wheels will spin the front shaft but the shaft is not engaged until 4 wheel drive is engaged.

Lone99star

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

Jan 05, 2010 | 1993 Chevrolet Suburban

1 Answer

4 wheel drive wont engage to front end drive shaft is turning and actuator is moving


acuator at transfer case or at frt diff if acuator is moving then axles to wheels should be turning and you may have a hub locking problem. if axles to wheels dont turn then the acuator tofront diff is no good not strong enough or bent shaft on acuator, some of these use a small shaft in front of actuator also make sure if this truck use this shaft check it for wear, lift truck remove actuator push inside arm in see if wheels spin turn frt shaft while holding arm in wheel should turn is they do, replace actuator, if they dont turn then diff problem,

Dec 06, 2009 | 1990 Chevrolet K2500

1 Answer

4 wheel drive light is on in my jeep


vacumn pod on the front axel is stuck on. Jack up the front wheels spin both tires at the same time and see if the front drive shaft turns. If it does the 4x4 on the axel is engaged. The front drive shaft on these should not turn when vacumn pod is disengaged. YJ's have a split axel on the right side inner axel shaft.

Apr 10, 2009 | 1992 Jeep Wrangler

1 Answer

1990 toyota 4runner 4x4 wont lock in front wheels


your drive shaft thats turning is mabe broke or your automatic 4x4 lockers could be bad

Feb 24, 2009 | 1990 Toyota 4Runner

1 Answer

Front wheel will not engage for 4 wheel drive


very possible. Put your jeep on 4 jackstands and put in 4 wheel drive. if the front drive shaft turns pull the vacuum disconnect and check the shift fork. They usually break before the shift actuator.

Jun 28, 2008 | 1992 Jeep Wrangler

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