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Unread 08-04-2010, 09:59 AM   #1
ytowntj
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Looking for a definitive answer - hp 30

I managed to shred the inside of my lp 30 last week and need a stronger and cost effective solution to replace it with - HP 30.

With the cost of a new ring and pinion for my old lp axle and the cost to have someone come to my house and set up the new gears I have been considering getting an hp 30 from ECGS.

Now to my question. After much searching I can't seem to find whether or not i will need adjustable upper ca s or not. Some say i will need them to correct caster angle but others say the caster will be the same as it is now. I'm at 2.5 inches of lift and have no driveshaft or caster angle problems.

So will i need adjustable control arms to correct caster angle when I do the swap?

Also will the stock front driveshaft work fine with an hp 30 at 2.5 inches of lift?

Thanks!

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Unread 08-04-2010, 10:05 AM   #2
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sorry i have no definitive answer for you... my suggestion would be to get the axle and install it w/o adjustable uppers, then see if you need them or not. its just one of those things that you can't really tell before hand. many will say you need them, but you could get away with out them. and it wouldn't kill you to drive it with stock uppers for a little while if your caster is off. my caster is wayyy off, i am on almost 5" of lift with stock uppers and drive it everyday and plan on doing so until i can afford adjustable uppers. good luck with your axle swap!
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Unread 08-04-2010, 10:22 AM   #3
Divinitous
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Quote:
Originally Posted by ytowntj View Post
So will i need adjustable control arms to correct caster angle when I do the swap?
With that amount of lift you're right on the fence with the arms or not. I'd say yes.
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Originally Posted by ytowntj View Post
Also will the stock front driveshaft work fine with an hp 30 at 2.5 inches of lift?
Technically the HP would raise the output of the driveshaft. Therefor making it "near stock".

When I did my HP D30 and 3.5" lift I pretty much did them together. I did use replacement lower/upper arms.
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Unread 08-04-2010, 10:31 AM   #4
vosevichs
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My buddy just swaped in a HP30. The driveshaft was fine at 4", he allready had adj. control arms. I'm picking up a HP30 tonight. I allready have adj. control arms. If you want to adj. the caster you'll need adj control arms. My jeep drove alot nicer when i adj. my caster. They are a very worth while investment.
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Unread 08-04-2010, 03:01 PM   #5
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I just did a hp30 and 8.8 swap in my 04. I have 2 in BB and zj v8 springs in the front with a winch and heavy front bumper, so my front lift is probably close to 2.5. I have Rokmen adjustable control arms and I had to extend the bottoms far out due to the pinion setting to low on the hp axle. my upper arms are as short as possible.
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Unread 08-04-2010, 03:20 PM   #6
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The main reason I bought my control arms was for strength.
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Unread 08-04-2010, 03:41 PM   #7
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I did my arms at the same time as the HP30. I have the stock uppers and adjustable lowers, I also only bought the LCA's for strength as my stockers were getting pretty gnarly. 2.5" of lift.

The stock drive shaft works fine.
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Unread 08-06-2010, 06:22 PM   #8
ytowntj
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Thanks for all of your replies. I'm looking at getting a set of currie adjustables for the front. Would you suggest upper or lower ones. I am leaning towards lowers because i would get the strength benefit as well. Also any other good brands you would suggest?
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Unread 08-06-2010, 07:20 PM   #9
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Honestly, there is no definitive answer. If there was one, it would be in the other threads as well.

I used my stock length driveshaft. I already had adjustable uppers and adjusted them differently to get my caster dialed in. Which was easier and required less sacrificing of pinion angle.

There you have it...another non-definitive yet somewhat helpful answer.
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Unread 08-06-2010, 07:27 PM   #10
ytowntj
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Yea I've kind of accepted that I will need adjustable arms now I am trying to decide if I should get uppers or lowers. I am leaning towards Currie but am open to suggestions
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Unread 08-06-2010, 07:37 PM   #11
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You MIGHT not need adjustable uppers...but with that said, they are nice to have since you can dial in your pinion angle and/or your caster. I'd get them if you can afford them. Curries are very nice, and then as the $$ becomes available you can continue to buy the Curries one pair at a time.
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Unread 08-06-2010, 08:17 PM   #12
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When I installed my HPd30 5 years ago i had adjustable lowers (TF) and OEM uppers with a 4" lift, I changed to Currie lowers later on. That was 4 years ago and it's still working well:

LP front axle drive shafts don't do well with this:

...
Oh yeah, that's a TW DS...
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Unread 08-06-2010, 08:20 PM   #13
ytowntj
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So then Curries are the best for the money then. I know the johnny joints on them are respected as the best and I don't have the 340$ to shell out for the JKS ones. 230 for uppers and 250 for lowers for the Currie ones isn't too bad.

So my question is can I get the Currie adj. lowers instead of the uppers to adjust my caster and pinion angle? That way I could replace my abused lower arms in the process?
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Unread 08-06-2010, 08:23 PM   #14
ytowntj
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I see knucklehead answered my last question mid-post. So
Currie lowers it is, and an hp30 for ECGS all for cheaper than getting new gears for the old lp 30. Sounds good to me. I will order them tomorrow!!
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Unread 08-06-2010, 08:55 PM   #15
xjfever
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Have you looked at ironman 4x4 fab control arms? He uses currie joints and they are priced pretty decent. Everyone I have seen who runs them loves them too. http://www.ironman4x4fab.com/TJ_Inventory.html
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hp30 , d30 , dana 30 , uca , upper , control arm , tj , wrangler

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