does a 94 have surburban have full time hubs???

[Supreme70]

I'm wondering if a 94 sub has full time hubs and is there a sensor or solenoid that locks in the front end????? It has a floor shift but when in 4 high it does seem to engage and I cant get it into 4 low???? it drives great in two wheel thou.
its a buds truck im trying to help him out. its all stock. any help would be great.

 

[dhcomp]

No hubs, the front locks w/ an actuator.

To go into 4 lo, put truck in neutral, turn it off, shift into 4 lo (Let off brake a little if it won't go in), start truck, put in drive.

 

[Supreme70]

No hubs, the front locks w/ an actuator.

To go into 4 lo, put truck in neutral, turn it off, shift into 4 lo (Let off brake a little if it won't go in), start truck, put in drive.

Does the actuator lock at the carrier???? I dont know anything about the 94 4 wheel system.

 

[sled_dog]

sort of. It is on the long side axle shaft. Just locks to shafts together (well not straight together).

The hubs are full time in the sense that the CVs are always spinning.

 

[longbedder]

Heads-up: those 4WD actuators are notoriously troublesome. They aren't very reliable at all. They have a little electric element in there that gets hot and the expanding air pushes a little plunger, which actuates the differential.

Mine is replaced with a cable - pull to engage and twist to lock, and you're good to go.

 

[dhcomp]

He mentioned that 4 hi works fine though, so i didnt' go into detail about the actuator....if the 4hi light comes on steady, actuator is working fine.

 

[longbedder]

Ya, true enough. I just know that if it's not broke now, it will be at some point

Those things can be very intermittent due to their design. They can even be affected by ambient air temperature (or dunking in water, snow, etc). IMO it's better to replace it even if it does currently work.

 

[Supreme70]

The light is not coming on but you can feel the transfer case go into gear . got it to go into 4 low but front axle pulling, does anyone have a pic of the actuator and its location. is it exterinal or inside???

 

[noJeepshere]

it should be a plastic piece coming out of the diff. at least i think so.

 

[90_K5 Blazer]

The 4x4 light comes on only when the front axles is engaged, regardless of if the transfer case gears are meshed.

Sorry I don't have a pic, but I believe it's on the passenger side of the diff. It's an external thing in the sense that the actuator can be pulled out without opening the diff. Costs about 70 bucks at an autozone, don't try a dealership, they'll rip you off with the price.

 

[throttleissues]

No hubs, the front locks w/ an actuator.

To go into 4 lo, put truck in neutral, turn it off, shift into 4 lo (Let off brake a little if it won't go in), start truck, put in drive.

Why would you turn off the engine? It is supposed to shift into 4LO with trans in nuetral with engine running, is it not?

 

[90_K5 Blazer]

No offense, but I've never, ever heard of having to turn off the motor to go into 4wd lo.

I've had GM 4x4's all my life, as long as your not moving more than a crawl and your trans is in neutral, your good to shift to 4 Lo, I've done it for years with no gear clash at all. It would kind of defeat the purpose if you had to turn off your truck every time you were in a pickle

 

[noJeepshere]

Why would you turn off the engine? It is supposed to shift into 4LO with trans in nuetral with engine running, is it not?

if you dont shift the t-case fast enough, the gears will grind. killing the motor prevents that from happening.

 

[daleearnhardt01]

if you dont shift the t-case fast enough, the gears will grind. killing the motor prevents that from happening.

Exactly, have had to do that many times in newer Chevy's with floor shift and older solid axle ones as well.

OKay as far as the actuator goes, I have some pictures to help. The actuator is on the front side of the axle tube (long side/passenger). This first picture is just of the passenger side tube when its disconnected from the differential case. The actual actuator isnt threaded in but you can see where it goes there on the front.

Here you can actually see the little plastic actuator.

Now this next picture just shows how it all works. The actuator pushes the shift fork over to lock the two piece shaft into one.