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Unread 03-28-2012, 02:08 PM   #1
brianestep
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d30 replacement

I have a ton of issues with my d30 (bearings, seals, bent tubes, probably s.t.d's) and have come to the conclusion rather than letting them nickel and dime me to death now, I'd rather just replace the whole axle and let them nickel and dime me five years from now. That being said, I have a 242 tcase, 3.73 gears, and a ujoint dshaft (which I replaced from the rzeppa nonsense). What are the best years to look for? I don't want to have to swap yoke/flange again, so I see 02-04 v8s would work for that cause, but do quadra-drive/trac axles work even though my transfer case won't be actively engaging them in slipping scenarios?

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Unread 03-28-2012, 02:11 PM   #2
mtnmarc
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if you are having this many problems with a dana 30, why swap in another dana 30?
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Unread 03-28-2012, 02:15 PM   #3
brianestep
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i don't fault d30's in general, just the one I have. I hit a deer, actually he hit me, bending the tube (not the axles fault), so seals won't seat properly, so fluid escapes, so gears grind, so axle shafts implode. I have about 180000 on the rest of the components, not too bad... They are cheap (relatively). What else would I put in there?
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-Brian- 2000 WJ Four liter, 4" RC springs; Bilstein 5100s; JKS trackbar w/KOR bushings; Stillen rotors; KOR (RC) 1.5" wheel spacers; 265/75/16 Treadwright Guard Dogs; Rusty AirTube, Amsoil Cone; Thule M.O.A.B.; Bumper delete; rear seat disco
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Unread 03-28-2012, 02:26 PM   #4
billzcat1
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VariLok axles are great with the 242. It will work fine when you are in any 4WD mode. It will still be there in 2WD, just wont receive torque. As for the yoke, most of the 02-04 V8s are yoked not flanged. But there are so many damn variations in front driveshafts there is no guarantee. When you are ready to buy, call the seller/junkyard/recycler and ask.
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Unread 03-28-2012, 02:38 PM   #5
brianestep
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Thank you sir. So basically any d30 will work then, provided gearing is the same. Yes, my biggest problem really is finding the right yoke, not the right axle itself. Is the difference between quadradrive/quadratracII in the axle itself and not the transfer case? In other words a q-trac axle wouldn't function any differently than a select-trac axle, whereas a quadradrive (varilock) would not be engaged with torque by the t-case any differently, but would engage from wheel to wheel on it's own?
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Unread 03-28-2012, 03:37 PM   #6
billzcat1
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Yeah, QD and QT2 used the exact same transfer case, just got VariLok differentials in the axles. Quadra Trac 2 and SelecTrac axles are identical.

And you got it right ,the QD axle would lock up on its own for side to side wheel speed differences, but if it isn't receiving torque this won't do anything. It has enough slack in the tuning of the differential not to bind up while turning (as long as you use the right fluid/friction modifier). But it will be there when you need it in any 4x4 mode.
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Unread 03-28-2012, 04:24 PM   #7
brianestep
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Sweet! Thanks Mr. Richard... quasi-locker upgrade FTW!
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Unread 03-28-2012, 05:21 PM   #8
kc2mrg
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just to add some info i got a 04 laredo with 4.0 and selec-trac and at the diff on the front is a u-joint, still the factory rezeppa at the t-case tho
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Unread 09-30-2013, 12:41 AM   #9
brianestep
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Resurrection! Both me and this thread! So I'm finally rich enough to swap my axle, but just moved in to an apartment. Damn you city jobs! This leaves me with two questions:

A) Is there any way to tell a quadra-drive axle from a quadra-tracII axle from the outside appearance? I believe the Tcase shifter should read QDrive, I just don't trust that some dummy hasn't swapped them out and I'm being lied to.

B) Since I no longer have a garage to do the swap myself, what is a reasonable price to have someone do it? There is a "rent-a-garage" with a lift and tools close to me, and I figure I can do it myself (with friend) in under 6 hours, costing me about $200. I would pay slightly more to not have to do it, because I'm fat. I think I'll replace hubs, ball joints, and upper control arms while I'm at it, depending on the mileage of the new axle.

Thoughts friends!?
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Unread 10-01-2013, 05:19 PM   #10
brianestep
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to the top!
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Unread 10-01-2013, 08:56 PM   #11
MuddyWJ
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Vari-lok diff covers have a stamp on it telling you how much friction modifier to use.
Dana 30 w/Vari-lok. - stamp reads "FSM 2.5"
Dana 44A w/Vari-lok - stamp reads "FSM 4.0"
Other than that you could take a axle shaft out and measure it.
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Unread 10-03-2013, 03:43 PM   #12
brianestep
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Quote:
Originally Posted by MuddyWJ View Post
Vari-lok diff covers have a stamp on it telling you how much friction modifier to use.
Dana 30 w/Vari-lok. - stamp reads "FSM 2.5"
Dana 44A w/Vari-lok - stamp reads "FSM 4.0"
Other than that you could take a axle shaft out and measure it.
Excellent. I was hoping for a stamp!
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Unread 10-03-2013, 04:41 PM   #13
780406jeeper
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Other way to tell too is to spin one tire. If the opposite tire rotates in the same dirrection, it has a ls (varilock diff), if it spins opposite, it is open and non- quadradrive. Even if the varilock is pretty worn, it still provides resistance and therefore rotates the opposing tire in the same dirrection.
Kevin
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Unread 01-21-2014, 05:39 PM   #14
brianestep
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I have been looking around for junkyard QD axles and finally found one at a reasonable price. Two questions:

I read that with proper maintenance, fluid, etc. that the Vari-Lok differential should last basically forever, assuming normal driving conditions.

Is the FSM testing procedure for Vari-Lok valid if the axle is in a junkyard vehicle, i.e. not able to be "primed"?

Are there any "wear" indicators to look for besides diff. fluid color (assuming it hasn't been drained yet)?

It has 180,000 miles, which is steep, but PO (and OriginalOwner, I think) was an old lady, so while I'm not worried about driving conditions, maintenance is a concern.
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Unread 01-22-2014, 09:18 AM   #15
brianestep
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^bump....

And also, when a Vari-Lock diff. wears out, does it function similarly to an open diff, where as it can still be used and "locked" via my tcase, but will not engage tire slippage from wheel-to-wheel across the axle?
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-Brian- 2000 WJ Four liter, 4" RC springs; Bilstein 5100s; JKS trackbar w/KOR bushings; Stillen rotors; KOR (RC) 1.5" wheel spacers; 265/75/16 Treadwright Guard Dogs; Rusty AirTube, Amsoil Cone; Thule M.O.A.B.; Bumper delete; rear seat disco
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