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Old 02-05-2014, 10:32 PM   #1
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High Pinion ARB's.

Have a question in regards to Dana 30 and High Pinion Dana 30 compatibility.

I just ordered a ARB for my D30. Will the ARB and gears(4.88's) swap over to a HP Dana 30 if I went that route?

If I were to find an HP Dana 30, what are the best years for the HP D30?

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Old 02-05-2014, 11:30 PM   #2
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The ARB can be swapped between a HP and LP housing but not the gears. 93-99 XJ D30s would be good bolt in axles.

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Old 02-05-2014, 11:36 PM   #3
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Thanks Jerry! Your always are the bearer of good news for me lol.
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Old 02-06-2014, 11:15 AM   #4
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What are the benefits of a "high pinion D30"?
I ask because I have a D44 out back and want to do something to upgrade my front D30.. I'm running 33x12.5 tires w/3:73's. I'd like to maybe lock the front but know I should maybe build that axle up a tad before doing so.
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Old 02-06-2014, 11:46 AM   #5
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Front HP axles run the gears so they mesh on the stronger side and the front of the driveshaft is positioned significantly higher up for more clearance away from rocks or other trail obstacles.
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Old 02-06-2014, 11:52 AM   #6
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Front HP axles run the gears so they mesh on the stronger side and the front of the driveshaft is positioned significantly higher up for more clearance away from rocks or other trail obstacles.
Mesh on the stronger side? So kinda the opposite of the normal limited slip where the least traction tire spins? I'm may totally be missing what you're trying to explain.
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Old 02-06-2014, 12:03 PM   #7
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Talking about where the teeth of the ring and pinion gears touch and push/pull from. There is a strong side and a weak side of the gear teeth. Moving the pinion gear of the front axle to the top (high pinion) causes the ring & pinion gears to engage on the other side of their teeth which pulls them into each other for added strength. The gears in a LP front axle are trying to push away from each other which weakens them.

It is just the opposite for the rear axle where the gears operate in their strongest mode with a low pinion axle.
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Old 02-06-2014, 12:10 PM   #8
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Mesh on the stronger side? So kinda the opposite of the normal limited slip where the least traction tire spins? I'm may totally be missing what you're trying to explain.
There's a running side of the gear and a coasting. The coasting side is the opposite side of which has the torque applied. When your pinion is applying torque to the ring gear in your rear end the basic motion of the two parts and the direction they're spinning pull them together. Now if you had a high pinion rear they would push apart (unless in reverse). Now with a front it's the opposite the high pinion pulls the gears together in forward motion. You get the same traction tires as that's the direction your driveline spins. Just a reverse cut gear up front which can take a whole lot more torque at the R&P then a low pinion that's essentially trying to push itself apart and skip teeth.(again in forward motion)
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Old 02-06-2014, 12:14 PM   #9
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Hope that explains things.
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Old 02-06-2014, 12:17 PM   #10
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I understand better now.... I've been trying kinda expand my knowledge of the way gears work and drive the axle.
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Old 02-06-2014, 12:19 PM   #11
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Old 02-06-2014, 01:58 PM   #12
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Ah this is good info. Might be enough logic to do as you Firemike and ARB the front for now and upgrade to a HP30 later instead of just jumping on the d44 bandwagon.
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Old 02-06-2014, 10:31 PM   #13
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Ah this is good info. Might be enough logic to do as you Firemike and ARB the front for now and upgrade to a HP30 later instead of just jumping on the d44 bandwagon.

My thoughts exactly! Especially becuase I have complete spare D30 in my garage. Except for the knuckles. The only real benefit in moving to a Dana 44 is a larger R and P, bigger Diff housing. Everything else is the same, such as tubes and U-joints, ect...

I will see how many shafts and/or Ring and Pinions I break before I start trussing the D30 though. I'm keeping the stock shafts and carrying spares with me right now, U-joints already installed.

ARB just arrived in mail today!!! Install time!!!
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Old 02-07-2014, 11:04 AM   #14
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I had looked at the g2 d44 which is a true 44 as opposed to a rubicon 44. With ARB/chromoly/installed gearing for $3k it is a really good price. But its a big chunk all at once. Going your route, I could spend the money on the ARB, then jump to the hp housing/gearing, and then finally jump to chromoly. I definitely like stepwise much better.

what was your shipped price for the ARB/compressor?
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Old 02-07-2014, 11:07 AM   #15
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and did you have to upgrade your axles to 30 spline already to use a 30 spline locker?
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Old 02-07-2014, 11:43 AM   #16
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Northridge 4X4 is where I got the ARB. It was overnight shipped to my door for $930. They gave me a 10% discount! They are up in Washington so it's usually a one day ship to my door.

I did not get the 30 spline kit. The reason I didn't go that route is is for three reasons. One; The cost is pretty high. I'm still not convinced I want to dump that much money into the D30, it has to prove its self first! Second; I kept the 27's, I have a spare D30 in the garage for the shafts. No one around me is going to have spare 30 spline shafts if I break a shaft or stub shaft. Third reason; I don't really want to move the fuse to my R and P. If anything is going to break I want it to be the ear's or U-joints on the shafts. That's also why I won't put RVC shafts in either. My style of wheeling, with 35's and a 4.0L I wont break the 30 spline shafts.

I'm not a big fan of G2, when an extremely knowledgeable Jeep builder convinced me not to go that route because of component quality. My logic, there is a reason the cost is so low.
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Old 02-07-2014, 01:36 PM   #17
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Yea I have been using NR4x4 as of late, their discount and free shipping is unbeatable on prices that are already competitive. That is where I bought my PS Rock sliders and where I was already pretty set on buying the ARB in the future (and rest of the PS set)
930 is a pretty ridiculous price. You already have the compressor then?

Yea, wasn't sure what spline the HP30 was, so I didn't know if you had to go 30 spline to prepare for that, or if you can stay 27 all the way through.

Any idea what install will cost? Installing yourself? Are you regearing at the same time?
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Old 02-07-2014, 01:38 PM   #18
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Quote:
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I did not get the 30 spline kit. The reason I didn't go that route is is for three reasons. One; The cost is pretty high. I'm still not convinced I want to dump that much money into the D30, it has to prove its self first! Second; I kept the 27's, I have a spare D30 in the garage for the shafts. No one around me is going to have spare 30 spline shafts if I break a shaft or stub shaft. Third reason; I don't really want to move the fuse to my R and P. If anything is going to break I want it to be the ear's or U-joints on the shafts. That's also why I won't put RVC shafts in either. My style of wheeling, with 35's and a 4.0L I wont break the 30 spline shafts.

I'm not a big fan of G2, when an extremely knowledgeable Jeep builder convinced me not to go that route because of component quality. My logic, there is a reason the cost is so low.
That is pretty sound logic. Thanks
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Old 02-07-2014, 01:48 PM   #19
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Ya I already had the compressor from buying the rear ARB for the 44. I am doing gears at the same time. I went with the nitro gears form JT differentials. The price at JT's for Nitro 4.88's and master install that included Koyo bearings was about $575. BY FAR the best deal of anybody I have found.

I am not doing the gears or lockers. The install price at Mountain-Air Off-Road is approx $1100. That price includes everything; pluming, gearing, electrical, ect... He is at the base of Mount hood.
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Old 02-07-2014, 02:13 PM   #20
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Ah, so about $2600 for ARB front and new gearing all around installed? Not too shabby. And the only half of that 575 is the real loss when moving up to the HP30
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Old 02-07-2014, 02:32 PM   #21
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Ya I will lose what I have in ring and pinions in the Dana 30 if I go to an HP30. It's about $3700-3800 including the install costs and fluids and all that.
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Old 02-07-2014, 02:36 PM   #22
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3700?? where did the extra thousand come from
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Old 02-07-2014, 02:57 PM   #23
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Dana 44 ARB- $1040
Dana 30 ARB- $930
Nitro gears- $600
ARB compressor- $200
Install labor- $1200

Total = $3970

So I was a little off. Plus I bought a Used Dana 44 for $850. So actually $4820 for the whole set-up. Man I think I have problem......
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Old 02-07-2014, 03:02 PM   #24
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Oh, right. I was excluding the rear 44 and compressor since you already have it installed.
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Old 02-07-2014, 03:11 PM   #25
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Quote:
It is just the opposite for the rear axle where the gears operate in their strongest mode with a low pinion axle.

Interesting... And yet makes perfect sense about the rear... Thanks

Mmmmmm delicious delicious jeep knowledge :steakandpotatoes

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