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Old 03-19-2015, 12:55 PM
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LP Dana 30 to HP Dana 30

Found a HP Dana 30 out of an XJ without the disco. The guy that has it owns a scrap yard and wants to trade it to me for my LP Dana 30. My question is do I need anything off of my axle before I make the trade.

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Old 03-19-2015, 01:22 PM   #2
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I would keep YOUR axle shafts (with unit bearings), and rotors.

This eliminates the possibility of getting a smaller U joint and also ensures that your rotor and unit bearing are correct for each other. There are some that are slightly deeper than others which can cause a problem. The other main benefit is that your brake pads and rotors are already worn/mated to each other.

Unless your gear ratio is the same, you will need to re-gear too. Depending on what gears you want, one might have the correct carrier to go to deeper gears, so you may want to look into that too to save from having to buy a new carrier.

You are lucky to be able to trade straight across.

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Old 03-19-2015, 01:34 PM
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I have been waiting on this axle to regear anyways so gear ratio isn't a problem. I'm regearing to 4.88 and Detroit lockers front and rear.
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Old 03-19-2015, 04:40 PM   #4
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I'm doing this same swap in mine next week, the HP30 I have has CV joints not u-joints, ( which is better?)
also has a lock right in it & 456 but I'm changing to a trutrac lil easier on the street.
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Old 03-19-2015, 04:59 PM
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I'm going with 4.88 and full Detroit's front and rear. I do very little highway driving.
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Old 03-19-2015, 05:03 PM   #6
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I'm doing this same swap in mine next week, the HP30 I have has CV joints not u-joints, ( which is better?)
also has a lock right in it & 456 but I'm changing to a trutrac lil easier on the street.
Can you please post a pic of the CV shafts? And CV, depending on what they are, could be much better.
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Old 03-19-2015, 05:19 PM   #7
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dropped axle off at buddy's who's doing the gear swap, I'll try to find a picture. I was told it came out of a TJ 97-98, the guy said some of them came with them. That I'm not sure of but it should bolt right in.
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Old 03-19-2015, 05:21 PM   #8
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No TJ came from the factory with a HP30....
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Old 03-19-2015, 05:22 PM   #9
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No TJ came from the factory with a HP30....
Or with CV shafts.
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Old 03-19-2015, 05:35 PM   #10
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I didn't think so, I will get a picture, it has cv shafts and no disco. on it. so are the CV's a better way to go?
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Old 03-19-2015, 05:41 PM   #11
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Depending on if they are custom cut from another vehicle or if they are bespoke CV shafts,

You can get quality alloy shafts for about $700, CV shafts from RCV off road will run $1050, they both have different strengths and weaknesses, really it depends on what your going to do in it and on what size tires.
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Old 03-19-2015, 05:47 PM   #12
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There are 3 front axles found in XJ's (all 3 are Dana 30 or “D30” differentials in either the HP or LP design)

Credit should be given to Crash for much of this information

All of them use an outer Unit Bearing style hub assembly (the bearings are built into the hub and the hub and bearings are replaced as a unit) The hub is always turning the outer axle shaft that is bolted thru the Unit Bearing and the shaft is what keeps the Unit Bearing from separating and falling apart. (Useful to know if you have u-joint or shaft failure on the trail, you cannot just remove the entire shaft and drive the vehicle with nothing bolted thru the center of the unit bearing, it will fall apart)

1984 to 1992 XJ's came equipped with a HP30 vacuum disconnect front axle that has an intermediate shaft on the passenger side that physically disconnects from the outer shafts, saving on gas and wear and tear on the drive train. The vacuum shift is shifted by the transfer case.

1993 to 1999 XJ's came equipped with a HP30 front axle (non-disco) that has one piece inner axles and rotates the differential and front drive shaft whenever the vehicle is moving.

2000 and 2001 have a low pinion D30 front axle (sometimes referred to as the TJ axle)
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Old 03-19-2015, 05:48 PM   #13
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... or if they are bespoke CV shafts...
Ten points for proper usage of "bespoke" in this context. DING DING DING!
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Old 03-19-2015, 05:50 PM   #14
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Found this on the Cherokee forum

Axle Joints:

Some 1984 to 1986 XJ's came equipped with CV (Constant Velocity) axle shafts. These are higher maintenance, hard to find, and most people swap them out for U-Joint shafts.

1986 to 1994 XJ's came equipped with the small (260 series) u-joint, EXCEPT All ABS and NP242 equipped XJ's came with the 297 size joint.

1995-2001 had 297 sized (larger and stronger) u-joints. 297 sized joints are the strongest of the three!

Housings:
The earlier disco housing has a two part tube on the right side with a separate cast piece pressed in the middle for the disco assembly, it is generally considered a slightly weaker housing then the non-disco housing and is much more difficult to install a truss onto. All disco housings have smaller 260 series u-joints and a three piece right axle shaft. (However it is possible to install a 2 piece axle shaft from a non-disco housing if the carrier is removed and a special seal is installed for the right side.)

The non-disco housing is the preferred housing stock, or as an upgrade to the disco housing and the Low Pinion housing. It is the easiest to install a truss system onto and very strong for it’s size. Many people have run 35’s with this housing by upgrading to Alloy axle shafts.
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Old 03-19-2015, 05:54 PM   #15
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Ten points for proper usage of "bespoke" in this context. DING DING DING!
I lernt that wachin some fellers on tha BBC, ain't it sumthin when people know stuff n stuff
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Old 03-19-2015, 05:54 PM   #16
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It can be rather rare around here on WF, HAHAHA!!!
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Old 03-19-2015, 06:02 PM   #17
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sounds like I'm going to need to swap out my LP shafts into the HP housing.. yuk what else do I have to switch over?
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Old 03-19-2015, 06:06 PM   #18
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sounds like I'm going to need to swap out my LP shafts into the HP housing.. yuk what else do I have to switch over?
That's a good thing...at least you know what you have.

Only other thing is the rotors.
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Old 03-19-2015, 06:13 PM   #19
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ok my LP rotors are shot the HP rotors are good , but they are not interchangeable?

thank you for the help too by the way, much appreciated..
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Old 03-19-2015, 06:18 PM   #20
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Everything but the ring & pinion are interchangeable, if your switching rotors be sure to replace the pads, or at the very least use the pads that are broken in on those rotors.

People usually take this opportunity to replace ball joints, pads and rotors, unit bearings, whatever you want and can afford, that way nothing is questionable later.
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Old 03-19-2015, 06:29 PM   #21
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Everything but the ring & pinion are interchangeable, if your switching rotors be sure to replace the pads, or at the very least use the pads that are broken in on those rotors.

People usually take this opportunity to replace ball joints, pads and rotors, unit bearings, whatever you want and can afford, that way nothing is questionable later.
Correct....BUT.....some unit bearings are slightly different which could cause the rotor and caliper to not fit correctly.

In the OP's case, if he decides to keep the rotors, then he should verify that they will work with his axle's unit bearings.

Also, depending on what year the HP30 came out of, the axle's may have the smaller U joints.

The parts ARE all interchangeable (minus ring and pinion), however, make sure you are getting the bigger U joints.
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Old 03-19-2015, 06:58 PM   #22
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I haven't seen anyplace that differentiates between the HP and LP D-30 as far as knuckles, ball joints, unit bearings, calipers, pads, axle shafts, carriers or u joints, not on part numbers anyway.

If you go to Rockauto you can switch between the TJ and XJ and compare the part numbers, not until you get back to 2-piece shafts or forward far enough (I want to say 05 but I'm not sure about that having not looked beyond 02 for my application).

When I built my HP-D-30 I used my LP knuckles, a TrueTrac, new 4.88s, my LP alloy shafts and replaced everything else with new.
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Old 03-19-2015, 07:06 PM   #23
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The split was mid '99
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Old 03-19-2015, 07:11 PM   #24
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I have a '99, I don't recall too many options.
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Old 03-19-2015, 07:17 PM   #25
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I have a '99, I don't recall too many options.
The split was on the XJ not TJ
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Old 03-19-2015, 07:20 PM   #26
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I am going to get all new brake components, my Ujoints I just replaced on the LP a shafts last July, only other pc is the wheel bearings I guess, oh ball joints but seem to be good.
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Old 03-19-2015, 07:22 PM   #27
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In fact, I'm just finding out you are 100% right. The split is TJs as well, the '99 model unit bearings are 1.91" from bolt flange to study surface, the '00 model year unit bearings are 2.13".

I didn't realize that, or I'd forgotten about it. Well done.
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Old 03-19-2015, 07:33 PM   #28
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Oh if my wife knew how much time I spent researching Jeep crap...lol

..wait...she does. That's why I'm always in the doghouse!
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Old 03-19-2015, 07:53 PM   #29
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Mine says it keeps me out of the way, I remind her of that every spring when I start buying parts for the yearly build.
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Old 03-20-2015, 09:20 AM
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Ok I found another axle out of a 97 XJ that I can buy out right and is half the distance from home for $300. Is this price about right because I would rather buy one and have my axle for parts than swap.

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