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2005 gmc envoy front diff swap now 4x4 won't engage just grinds. Front driveshaft turns.

Original intermediate shaft had no lock ring. Used same shaft and it seemed to go into the replacement diff further. Do not know what replacement unit came out of.

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6ya6ya
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Posted on Jan 02, 2017

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  • 5 Answers

SOURCE: front axle - front drive shaft Toyota tacoma 1998 4x4

more than like have a broken axle shaft, un hook the rear drive shaft and put it in 4wd if it wont move then you know you got a broken axle shaft or spider gears broke in the pumpkin

Posted on Dec 09, 2008

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  • 78 Answers

SOURCE: four wheel won't engage

Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Posted on Dec 29, 2008

  • 508 Answers

SOURCE: Right-Front Intermediate Axle Shaft Bearing

I am assuming this is an all wheel drive. That being the case you probably have an axle CV joint going out. If you hear noise when making a sharp left or right turn and accelerating that would more than likely be the problem. And, yes this is a serviceable part. Easy to replace if you have the proper tools to accomplish the task. Good luck.

Posted on Feb 18, 2009

  • 1 Answer

SOURCE: 4 wheel drive (auto locking hubs) seems to be trying to engage.

I had the same thing happen. The automatic locking hubs are faulty, causing one or both hubs to try to engage or disengage onto the front driveshaft. This makes the clicking noise and loud clunking that you hear. You may notice your steering pulling to one side of the road,because one hub is locked in. Replace the automatic hubs with new ones, do not try to fix the old ones. I liked the
convience of automatic hubs but replaced mine with manual hubs, there just way more reliable.

Posted on Jun 06, 2009

stevenhurc
  • 450 Answers

SOURCE: how to replace front cv shafts ?

remove inner cv boot, just on inside edge is circlip which holds inner bearing joint into outer housing remove circlip and separate joint outer housing does not come out of front diff unless you drop or remove whole front diff assembly
will have to remove whole stub axle hub assembly to remove drive shaft from outer wheel stub axle (hub) assembly

Posted on Aug 06, 2009

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How do you pull a 1979 gmc jimmy 4x4 rear right axle


QU40221 19 Spline Outer Axle Shaft for 1977 to 1991 Chevy, GMC Corporate GM 10 Bolt Front Axle is a genuine original equipment outer axle stub shaft for all GM 10 Bolt front axles in 1977 to 1991 Chevy Blazers, GMC Jimmys, and Suburbans, plus Chevy, GMC 4x4 1/2 ton and 3/4 ton Pickups. The splined end on these new axle shafts has three snap ring grooves in three places so they are compatible with all types of automatic and manual lockout hubs plus all full-time solid splined drive gears.

Also available while supplies last: QU40221U Used Outer Axle Shaft with 3 snap ring grooves and QU40660UUsed Inner Axle Shafts with 2 snap ring grooves (QU40660U is not compatible with automatic locking hubs)



see this vdio

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When it is in 4x4 check and see if you can turn the front drive shaft. If you can the problem is in the front end. If you can't the problem is in the trasfercase.

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Look under there and see, but I think they (the hub locks) are engaged by vacuum motors.

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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.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

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If you have locked hub drive in the front end then that shaft will be turning all the time when moving as the front wheels will be making it turn through the diff,. If you have free wheeling hubs that allow you to disengage the hubs then the shaft will be turned from engagement from the transfere case. In that case check that you are in fact changing out of 4 wheel drive and the actuator is not jammed or rusted in the engaged position

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unless you welded your front diff thats normal. unless you have manual hubs best bet is the differential actuator is faulted

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Do you have the front hubs disengaged and the shift lever in 2wheel drive. If this is the case, the tyres will fight against each other while turning on bitumen.

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1 Answer

97 blazer 4x4


Had an issue similar to this with a customer astro van. It was the front differential that destroyed itself. We took the front driveshaft off and he drove it like that for a while. Then sold it. So, I am not sure what happened inside that front axle, but is was locked up. As long as we took off the driveshaft, the spider gears were the only thing spinning internally. So it could be driven again.

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Place vehicle in 4wd (high or low). This will hold the front drive shaft still for the rest of the test. Jack up the front end of the vehicle. Remove the actuator. Have a buddy spin the right front wheel while you use a long punch or screwdriver to try to manually engage the diff. The left front wheel should spin in the other direction if the diff is good. Also before you check the diff you need to grab the front driveshaft and make sure it is locked, If it spins freely when the truck is in park and in 4wd with the front end raised then problem is in transfer case. If you can't make the diff engage manually with punch then the problem is in the diff. If front diff engages manually then the problem is the actuator. Hope this helps..

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