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Front differential quit working after changing transfer case what would cause this?

I changed the transfer case on my 1997 gmc safari all wheel drive now the front differential doesn't work

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Changed the transfer case with what,a used unit?

That is something all shops do
Install a used up salvage yard piece

That's your problem

You always break yours down & repair

Posted on Jan 09, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: 4wd will not engage on 2002 gmc sierra 1500

try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)

Posted on Jul 04, 2009

  • 1 Answer

SOURCE: hummer h2 transfer case

Only way for this to happen on an H2 (AWD) is for something to break rearward of the lockup hub. Take a look at the splines between the intermediate shaft and centerdifferential or even the teeth on the forward sun gear and/or stepped pinion on the center diff.

As long as you have the t-case torn down for repair be sure to upgrade to the new aluminum mode fork (production upgrade to old plastic forks thru end of 2007 or so). You should also upgrade the rear half of the housing to the 2008 version which has a pressed-in rear prop bushing (better bushing and is also replaceable.

Posted on Sep 30, 2008

jryan11kc343
  • 19 Answers

SOURCE: 4x4 wont engage front wheels

check switch or sensor on transfer case

Posted on Mar 07, 2009

  • 81 Answers

SOURCE: Transfer and Differential oil change for RX300

your front wheel drive rx300 doesnt use gear oil, the differential is lubricated internally by transmission fluid. the trans fluid is only reccomended if its dirty. if its a dark brownish red thats normal. or if its pinkish red then its new. if its black or yellow then time to flush it out. if you decide to change the trans fluid I believe the spec is 3qts. check it with the engine running and cold. thats the most accurate way to check it.

Posted on Oct 08, 2009

Testimonial: "Your clarification is very helpful. Thanks a lot. I did not find the answer clearly anywhere. Does this transaxle unit has only one outlet?"

Molson02536
  • 3854 Answers

SOURCE: 1995 gmc yukon wiyh 6.5 diesel 4 wheel drive will

On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

If I were you, I would buy a new heated actuator. They are available at most auto parts stores, and are about $90. They are also on eBay for about $55 plus shipping. These are very easy to change - just thread out the old one, and thread in a new one.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Posted on Jan 02, 2010

Testimonial: "This is exactly the info i need to troubleshoot and repair efficiently complete with wire numbers and colors thanks for the help buddy"

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1 Answer

1990 GMC suburban actuator and fuse location. There is not one on front differential and no place for fuse in fuse block. 4 wheel will not engage. No owners manual


The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

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What is the differential and does it need flushed?


the differential is that item that allows one shaft to move separate to the other connected shaft. That is to say the left wheel to go faster /slower than the right wheel as in going around a corner or moving on uneven ground. There is one in front wheel drive vehicles , in rear wheel drive vehicles , and if you have an All wheel drive vehicle there is another between the front wheels and the rear wheels in the transfer case /gearbox. Unless you have metal or water contamination in the unit or have used the wrong oil in the unit it is not necessary to flush out the diff. Changing the oil as you would the sump oil is sufficient ( drain out and refill).A word of caution here. There is a special oil used in limited slip differentials so make sure that you replace the drained oil with the correct oil for the diff as damage will result if you don't.

May 17, 2014 | 1997 Ford Escort

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2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

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1 Answer

Front differential cause howling


Is it the front diff?

Could be a wheel hub bearing

Have you checked the diff oil level
or ever changed it

Maybe the transfer case is the issue

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1 Answer

1997 toyota tacoma will not go into 4 wheel drive


Has the transfer case ever been serviced? The fluid should be changed every 30,000 miles, if not the works can stick and cause engagement problems. Make sure the vacuum to the front hubs is available, if the front hubs are not locking the front drive shaft will turn but no Front wheel lock up and no 4 wheel drive is available.

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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.

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I'm having problems getting the 4 wheel drive to engage


It sounds like the front differential is not disengaging. What you will need to do is determin if it is due to the front differential staying locked or the transfer case being engaged. To do this, all 4 wheels will need to be off the ground and the vehicle allowed to coast in gear to determine which it is.

If you look at the front drive shaft and roll the truck on the ground, if the transfer case or the front differential is locked, it will turn either way, so all the wheels will need to be off the ground. If you do not have the resources to do such a diagnosis, please do not jury rig a set up. This is a heavy truck, and you could be injured. A lift is really needed.

Once you know if it is the transfer case or the differential, this will make diagnosis much easier.

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1 Answer

Front differential quit


Does that have an electric clutch? I'm thinking it does ... I'm not really the guy to give you a comprehensive answer on this ... but check the power to the clutch.

Thanks for your interest in FixYa.com

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My safari all wheel drive 92 gets a vibration at around 85km. I have changed the universal jionts and the transfer case but it is still their?


If you feel it in the front end it is a very good possibility the it is the wheel bearings....if in the rear....the rear wheel bearings are questionable....OR you could tell me where you are feeling the vibration from.... ;)

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