Front drive shaft still turning in 2WD?? - JeepForum.com

 
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post #1 of 14 Old 12-21-2006, 11:02 PM Thread Starter
nico1
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Front drive shaft still turning in 2WD??

I was getting ready the snow coming and wanted to make sure everything was working with the 4WD before it hits. Everything engaged fine when I went from 2WD to 4HI then from 4HI to 4LO. No problems from 4LO back to 4HI either. Now when I switch back from 4HI to 2HI it feels like the transfer case disengages but after terrible gas mileage over the last couple days I went under to have a look. Even though it feels like the front drive shaft is disengaged it is still turning. Is this due to the front axles not disengaging from the front dif? If so what is the fix?

I am guessing something wrong with a vacuum line but again I am just guessing???

Thanks!


99 TJ Sport, 2" BDS Lift, 1.25" JKS BL, 1" JKS 1" BMML, 32" BFG/AT, TKH Fab Front Bumper, Sirus Satellite Radio
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post #2 of 14 Old 12-21-2006, 11:06 PM
SecondTJ
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there are no vaccuum lines in engaging the TJ transfer case

'98 Sport, 4.0, AX-15, D44, 3.73, stock w/ 9k original miles

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post #3 of 14 Old 12-21-2006, 11:11 PM
Jakemd98
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i took mine out for better fuel economy.... not really, but i did take it out.

If i'm correct, the front DS turns no matter what. it is driven by the front axle, and basically is in neutral as far as the t-case is concerned.

but i could be wrong

Jake Davis

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post #4 of 14 Old 12-21-2006, 11:13 PM Thread Starter
nico1
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Quote:
Originally Posted by SecondTJ
there are no vaccuum lines in engaging the TJ transfer case
So is there anything in place on the TJ up front that disengages the front axels from the dif to stop the front drive shaft from spinning or does it allways spin even in 2wd?? Sorry just trying to understand the setup. Thanks!

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post #5 of 14 Old 12-21-2006, 11:21 PM
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Quote:
Originally Posted by nico1
So is there anything in place on the TJ up front that disengages the front axels from the dif to stop the front drive shaft from spinning or does it allways spin even in 2wd?? Sorry just trying to understand the setup. Thanks!
You would need some sort of locking front hub kit to disengage your front axle shafts.

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post #6 of 14 Old 12-21-2006, 11:21 PM
SecondTJ
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Quote:
Originally Posted by nico1
So is there anything in place on the TJ up front that disengages the front axels from the dif to stop the front drive shaft from spinning or does it allways spin even in 2wd?? Sorry just trying to understand the setup. Thanks!

as i understand it, the front driveshaft turns even when in 2wd, its just not engaged

'98 Sport, 4.0, AX-15, D44, 3.73, stock w/ 9k original miles

Gone - 2000 Sport, 1987 YJ, 1997 SE
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post #7 of 14 Old 12-21-2006, 11:29 PM
paultyler
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Quote:
Originally Posted by SecondTJ
as i understand it, the front driveshaft turns even when in 2wd, its just not engaged
That's right.

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post #8 of 14 Old 12-21-2006, 11:31 PM Thread Starter
nico1
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Ok, sounds like everything is normal then. Thanks for answering my dumb questions.

99 TJ Sport, 2" BDS Lift, 1.25" JKS BL, 1" JKS 1" BMML, 32" BFG/AT, TKH Fab Front Bumper, Sirus Satellite Radio
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post #9 of 14 Old 12-22-2006, 12:02 AM
harpo1
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You have automatic hubs so the drive shaft turns all the time.

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post #10 of 14 Old 12-22-2006, 01:16 AM
sryan2k1
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Quote:
Originally Posted by harpo1
You have automatic hubs so the drive shaft turns all the time.

Automatic hubs would be the electronic locking type, our TJs have permanently locked hubs, which is why the drive shaft always spins, and which is why it can be thrown into 4wd at almost any speed, since the hubs don't have to lock
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post #11 of 14 Old 12-22-2006, 04:30 AM
Brew461
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Side bar here.

What kind of Gas mileage increase do people see when the warn manual hubs are installed?
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post #12 of 14 Old 12-22-2006, 05:01 AM
Overdrive
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They are called drive flanges on a TJ. There is no lock/unlock. The hubs are attached to the axle by the flange.
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post #13 of 14 Old 12-22-2006, 05:35 AM
stedwest
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Quote:
Originally Posted by brew461
Side bar here.

What kind of Gas mileage increase do people see when the warn manual hubs are installed?

I talked to one local, who said his locking hubs made no difference in fuel mileage. Look at his set-up, however, and you'd know that his rig isn't built for gas mileage anyway...

2003 SE, 4.88's, Yukon axles, Rancho springs, JKS Disco's & MML, RE trackbars, ZJ steering, and a bunch of other stuff my wife hasn't found out about...
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post #14 of 14 Old 12-22-2006, 08:19 AM
mrblaine
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Quote:
Originally Posted by Overdrive
They are called drive flanges on a TJ. There is no lock/unlock. The hubs are attached to the axle by the flange.
Drive flanges are typically used to replace a locking hub on vehicles so equipped.

There are no locking hubs on TJ, thus no drive flanges.

It's a unitized bearing assembly just like a front wheel drive mini-van has.

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