Going HP Dana 30 Shopping tommorow

Art101 · 03-09-2009, 08:59 PM

Well its about that time that I ditch the stock LP Dana 30. I will be going to Pick N Pull tomorrow to grab a HP Dana 30 with 3.55 gears. What do I need to know? How can I quickly tell if it is a 3.55 gear ratio? What is the list of tools I should bring with me? Any tips? What models do NOT have the vacuum disconnects?

**xJoshxx** · 03-09-2009, 09:07 PM

it would show the gear ratio somewhere on the pumpkin

Art101 · 03-09-2009, 09:09 PM

where? what numbers?

**xJoshxx** · 03-09-2009, 09:12 PM

Quote:

Originally Posted by Art101

where? what numbers?

would say 3.73 or 3.55 ratio or w/e on a little metal tag

Art101 · 03-09-2009, 09:40 PM

ok i'll check the silver tags...

anyone know the biggest size socket/wrench i'll need?

Inavacuum · 03-09-2009, 09:46 PM

the tag should be bolted down by two of the diff cover bolts, it'll probably be hard to spot at first but it should be there. there will be a bunch of numbers but somewhere the should be a 3.73 or 3.55. If you're having trouble or you're still skeptical you can always 411 the closest Jeep dealer and give them the VIN and ask.

pop the diff cover and inspect. see how much metal is collected on the plug. If you can get it stripped down enough, you should be able to turn the yoke by hand with little effort.

I'm not sure of the biggest size socket. Definitely the control arms though. Why don't use yours as a gauge, they've gotta be close if not the same.

Art101 · 03-09-2009, 09:51 PM

and what size wheel spacers do i need to make it the same size as the stock d35?

Inavacuum · 03-09-2009, 09:57 PM

Quote:

Originally Posted by Art101

and what size wheel spacers do i need to make it the same size as the stock d35?

huh??

you do not need wheel spacers for an hpd30....

Art101 · 03-09-2009, 09:58 PM

lol what the hell was i thinking... i was thinking ahead for the 8.8 swap

CLNinja · 03-09-2009, 10:07 PM

if i remember correctly... the largest wrench you will need is a 21 and that would be for the LCA's.... i recomment taking a good socket-wrench set as well as some wrenches... ( socket on bolt head, wrench on nut so it doesnt spin)

you will also need some torx for the UCA's

Inavacuum · 03-09-2009, 10:12 PM

Quote:

Originally Posted by CLNinja

you will also need some torx for the UCA's

good call! I forgot about those bastards. I think its a T55

CLNinja · 03-09-2009, 10:15 PM

and yes... the bolts on your LP30 will be the same so just go check your axle ... the Lower control arm will be the largest... it will be a different size for the nut than the bolt.. i beleive you need an 18mm and a 21 mm for the lower control arms but check to be sure

Art101 · 03-09-2009, 10:54 PM

anyone sure on the torx size? is t55 right?

StellaTheZJ · 03-10-2009, 01:14 AM

The only problems caused by this swap are: Driveshaft and caster issues.

I had the 249 when I bought my '96, and it had the CV at the diff. Changing diffs forced the CV to change lengths, and I guess it had kind of worn in after 320,000kms. It vibrated pretty bad, even though it was smooth after the 3" lift. IF you have a regular U-Joint front drive shaft, no problems.

The ZJ adjusts caster on the diff end of the LCAs. The XJ adjusts caster on the frame end of the LCAs. My HP D30 swap (from a 1990 XJ) worked out fine with no adjustment, but I noticed while I was down there that the ZJ frame is actually set up for the XJ caster adjustment IF you elongate the LCA bolt hole in the frame (the way the XJ hole is from the factory). So, why not pick up the frame-end shims, and the u-shaped bracket for them, from the XJ that donates the front diff? You don't want wandering steering or death wobble!!!

Now just as an aside, I like 2wd low range for slow traffic and tricky work with a heavy trailer. If you put in a vacuum disco HP D30 with manual control of the disco, it's kind of like having locking hubs, so you can arrange for 2wd Low Range. Also, a disco D30 allows you to run a locker on the front with no issues on the street. I don't have a disco diff right now, but when I put in the WJ conversion, I might go that route. The only hard part is finding the ABS YJ disco Pass Side axle, so you can run ABS, The Dr Side axles are all interchangeable...

Something to think about when I should be working...

03-09-2009, 09:46 PM	#6
Inavacuum Registered User Join Date: Mar 2007 Location: Griffin, GA Posts: 525 Profile Gallery Classifieds My Jeeps	the tag should be bolted down by two of the diff cover bolts, it'll probably be hard to spot at first but it should be there. there will be a bunch of numbers but somewhere the should be a 3.73 or 3.55. If you're having trouble or you're still skeptical you can always 411 the closest Jeep dealer and give them the VIN and ask. pop the diff cover and inspect. see how much metal is collected on the plug. If you can get it stripped down enough, you should be able to turn the yoke by hand with little effort. I'm not sure of the biggest size socket. Definitely the control arms though. Why don't use yours as a gauge, they've gotta be close if not the same. __________________ 95 ZJ 4.0 PART OUT: Silver Body; Grey Cloth interior HPD30;RE BB w/ RE Shocks;KOR Rad Support KOR XMember/TC Skid Make an offer on anything you're interested in.