factory lockout ?'s

[rednck21]

can someone explain how these work? i hear some are vaccum actuated and some are not. i dont think ive ever seen one thats not. the hubs on mine will lock and unlock when they are in the auto setting.

also, do all 99+ 4x4's have unit bearings?





Blane

[DCSpecial]

The ESOF (electric shift on the fly) trucks have the auto hubs. When you turn the knob to 4x4 the hubs should automatically engage (yes, they are vacuum actuated).

If you had the manual transfer case (with the lever on the floor) you would have manual hubs with the LOCK and FREE position.

My truck came with auto hubs...I've since swapped them out for Warn Premium Locking Hubs.


Yep, all 99+ 4x4s have unit bearing assemblies. Not the greatest design. Dynatrac offers the Free Spin kit that give you 35 spline outers, fixed spindles, wheel hubs, bearings, Warn Premiums, etc.. So that you can ditch the unit bearing setup and actually be able to repack your bearings. Also the bearings are spaced out better in the Dynatrac setup vs. the stock unit bearings. The stock unit bearings have both bearings fairly far inward (IMO).


Hope this helps.

[rednck21]

hmmm...i always though they all had the "auto" hubs. so the manual tcase trucks dont have any sort of vaccum setup going to the hubs?


also, dont the stub shafts have a bottle neck in them?

[DCSpecial]

Right....no vacuum at all with the manual t-case. You have to get out and lock the hubs with that.

The stub shafts don't bottleneck.
It's the inner shafts on the Dana 50 (used on 99-01 SRW SDs..and some early 02s) that are 1.5" but taper down to 1.31" at the splines.
The Dana 60s (DRW trucks 99+ and SRW trucks 02+) have inner shafts that are 1.5" throughout.

[GREGROB]

Originally Posted by DCSpecial

Right....no vacuum at all with the manual t-case. You have to get out and lock the hubs with that.

The stub shafts don't bottleneck.
It's the inner shafts on the Dana 50 (used on 99-01 SRW SDs..and some early 02s) that are 1.5" but taper down to 1.31" at the splines.
The Dana 60s (DRW trucks 99+ and SRW trucks 02+) have inner shafts that are 1.5" throughout.

You sure about that? Mine has the shifter lever in the floor, but has vacum lines running to the hubs, or at least what I was sure was vacum lines.

I'll have to look again, maybe that's why they're not working.

[DCSpecial]

I'm fairly certain. Although...it's late and it's been awhile since I've seen a truck that didn't come with ESOF so I could be wrong....

Do your hubs have "Free" and "Lock" or "Auto" and "Lock" on them?

Are there three lines coming down going to the caliper/knuckle/hub?? Brake line, ABS (assuming you have front ABS) and Vacuum??

[rednck21]

GREGROB, thats what i was thinking. i dont think iv ever seen one without the vaccum lines, but that doesnt mean they dont exist

[DCSpecial]

I was just talking to a buddy of mine with a 2002 SD with the manual t-case......no vacuum lines, have to manually lock the hubs.

[rednck21]

interesting. i think its safe to say ive never seen one. maybe i should start paying more attention

[GREGROB]

Originally Posted by DCSpecial

I was just talking to a buddy of mine with a 2002 SD with the manual t-case......no vacuum lines, have to manually lock the hubs.

I looked today at the hubs, the say FREE and LOCK. Will look for lines next time I'm under it.

[DCSpecial]

Originally Posted by GREGROB

I looked today at the hubs, the say FREE and LOCK. Will look for lines next time I'm under it.

Yep....manual hubs.
You can see the lines from the wheel well. The brake line goes to the caliper, the ABS line is held in with a allen head bolt to the unit bearing assembly (comes from behind the plastic inner fender goes to the frame and the to the unit bearing), and the vaccuum line (if yoiu have one) goes to a barbed fitting on the steering knuckle from the frame rail.


Hope this helps.