Question about GMC 98-04 Jimmy Sonoma Chevy S-10 Blazer 4x4 4wd Transfer Case Control Module

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98 chevy Blazer 4x4 front wheels not turning everything looks ok actuator ect. could something be wrong in the front differential?

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Jack both front wheels up. Rotate one one way, the other should rotate the other way freely, and the drive shaft should spin if four wheel is engaged.

Posted on Nov 29, 2013

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1 Answer

My 4x4 won't engage on my 98 Jimmy. Think it's a problem inside the front differential possibly.


there should be a solenoid on a front differential it could be electrical or could be vacuum operated but I would check there. I had an issue with my brother in laws 4x4 and we change the solenoid and everything worked fine

Jan 16, 2015 | GMC 98 99 00 01 Blazer S-10 Jimmy Bravada...

1 Answer

I have a 98' Chevy 4x4 blazer. When exccelerating


Check condition of tyres.
Also jack the vehicle up and spin each wheel, listening for a wheel bearing noise.
Another possibility might be either the differential or any drive shaft couplings.

Nov 08, 2012 | Cars & Trucks

1 Answer

Why won't my front differential engage? 1988 Chevy


Ok I know this question is old but for any one else who has this problem, I want to clear some info up. GM did not use vacuum on the 4x4 systems on the full size series. Only used on the S series (S10, S Blazers). Here is how to accurately trouble shoot these problems with the full size 4x4. Remove the front actuator from the front axle ( keep it plugged up and let it hang). Put the T-Case in 4x4 Hi or Lo doesn't matter. Turn key on (don't start the engine) . Now check the actuator to see if it has extended. If (no) now check the plug to see if you have current . If you have current to the plug, change the actuator. Problem solved. If no current to the plug. Check for broken wires ( fix if any) If no broken wires. There is another switch on the T-Case that sends power to the actuator Replace it.. Back to the actuator.... If everything checked out and actuator works. With the T-Case locked in 4x4, try to turn the front drive shaft by hand. With the T-Case locked in 4x4 you shouldn't be able to turn the drive shaft. If drive shaft doesnt turn the T-Case is in good shape and the problem will be in the front differential. In these cases the most common problem is an exploded thrust washer. At this point the front differential needs to be rebuilt. Back to the T-Case..... With the T-Case locked in 4x4, if the drive shaft spins, the problem will be in the T-Case and at this point the T-Case will need rebuilt......... I hope you get the information you need to troubleshoot the GM 4x4 issues.

Feb 21, 2012 | 1988 Chevrolet K1500

1 Answer

I got a 96 chevy 4x4 and my front wheels aren't pulling. i replaced the acuator and still nothing. everything sounds like it is engaging but no turning of the front wheels. do 96 models have auto locking...


96 chevys have a ifs (independent front suspension) this give it more ground clearance but does not have lock out hubs, the cv axles go into the front differential an spin freely until you put it in 4wd, how this works is your transfercase spins the drive shaft that goes into the front differential an while you put it in 4wd it sends power to the actuator to lock the front differential. if your front end isnt pulling you either popped your 1 of your cv axles but if you did this you would know because it makes a very loud thunking noise while you're driving, my guess is you have a short thats not sending power to the actuator. check to see if the wiring harnesses are connected and check if the fuse that operates the 4wd in the cab of the truck is not blown. also actuators for these trucks are horrible they go out alot

Feb 11, 2011 | 1986 Chevrolet K1500

1 Answer

I have a 1991 chevy blazer s10 and the 4x4 isnt working I put a new actuator in it under the batter and its still not working, the transter case seems to be working but the differential isnt locking in for...


It will have 2 actuators one for the transfer case and one for the front differential it might also be the switch on the dash thats what it was on my truck.

Dec 13, 2010 | Chevrolet Blazer Cars & Trucks

2 Answers

4x4 not wprking in my 98 blazer


replace the actuater 59.00 at auto zone

Mar 06, 2009 | 1998 GMC Jimmy

1 Answer

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.

Jan 28, 2009 | 1995 Chevrolet Blazer

2 Answers

1999 chev blazer 4x4 system


I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Nov 23, 2008 | 1999 Chevrolet Blazer

4 Answers

96 chevey blazer 4x4


Sounds like the front axle electric actuator is bad. these are mounted on the front differential housing. they are known to go bad.

Nov 02, 2008 | 1996 Chevrolet Blazer

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