NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA's Technical Forums > Modified Tech Discussion
Register FAQ Users List Calendar Mark Forums Read
HOME Member FAQ Sponsor Info Rules Donate Bylaws Store Members Chat E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old August 22nd, 2017, 06:02
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Front Axle Options

Hey guys, recently acquired a 98 XJ Sport with the HPD30 3.55 front axle. It has a 4-1/2" Zone lift on 33" BFG AT's. I've been researching aftermarket support for the D30 and coming up with some options for how to move forward. After my investigation on my axle, it's going to need a drag link, tie rod, pinion seal, diff cover refresh, U-joints on at least the axle shafts, most likely the driveshaft as well and potentially wheel bearings. I'm not sure what the health of the pinion and ring gear are, haven't cracked the cover yet. The brakes are good but that's about it LOL.

My first thought was to just snag another HPD30 off of a bone yard XJ but that's rolling the dice too, most likely would be better than what I have now though.

So the question that's been asked a million times, what should I do here? Budget is pretty skinny, I bought a house and a trailer to haul the XJ, along with several other major purchases this year. I have a few wheeling trips planned in the next few months so I either do this now or just wait until late fall. Thanks for the pointers guys!
Reply With Quote
  #2  
Old August 22nd, 2017, 06:21
SBpunk SBpunk is offline
NAXJA Forum User
 
Join Date: Jan 2013
Location: Enid, OK
Posts: 335
Re: Front Axle Options

HP D30's are cheap and damn near everywhere. Bring a 13mm socket/wrench with you to open the covers and check the gears. Even if you do get one that looks good I'd still change out the inner tube seals and ball joints. Steering stuff is pretty cheap also. V8 ZJ tie rod/ends are a decent upgrade for the money. If you can find a later model XJ in the junkyard grab the shafts. The years escape me at the moment but they're able to fit larger ujoints and slide right into the older HPD30s. You'll want to modify them to use full circle clips though. Plenty of youtube videos and just takes some patience and a hack saw.
Reply With Quote
  #3  
Old August 22nd, 2017, 06:27
Green XJ Jeep Green XJ Jeep is offline
NAXJA Member 4950
 
Join Date: Mar 2011
Location: Spanaway Wa
Posts: 355
Re: Front Axle Options

Sounds like normal maintenance stuff even on a jy d30.
The only real benefit to getting another d30 is that you can throw it on some stands and re build it at your leasure.
Reply With Quote
  #4  
Old August 22nd, 2017, 06:33
VAhasnoWAVES VAhasnoWAVES is offline
NAXJA Forum User
 
Join Date: Sep 2008
Location: Lake City, Mi
Posts: 5,375
Re: Front Axle Options

^^^^ agreed

i would be replacing all of those things on a JY axle anyway.

as long as the backlash feels good and the fluid doesnt call for alarm in your current axle, i would just rebuild that one. the only reason i see to replace a D30 with another JY D30 is because something happened with the gear set, and its simply cheaper to replace the axle than it is regear it to stock.
Reply With Quote
  #5  
Old August 22nd, 2017, 06:56
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Re: Front Axle Options

Quote:
Originally Posted by SBpunk View Post
HP D30's are cheap and damn near everywhere. Bring a 13mm socket/wrench with you to open the covers and check the gears. Even if you do get one that looks good I'd still change out the inner tube seals and ball joints. Steering stuff is pretty cheap also. V8 ZJ tie rod/ends are a decent upgrade for the money. If you can find a later model XJ in the junkyard grab the shafts. The years escape me at the moment but they're able to fit larger ujoints and slide right into the older HPD30s. You'll want to modify them to use full circle clips though. Plenty of youtube videos and just takes some patience and a hack saw.
I've read up on replacing those seals, ball joints and the ZJ steering upgrade. The good years for the Dana 44 axle shafts are 97-99, I think not sure. You're talking about the 5-760X U-joints I'm assuming on the later XJ's? youtube has been a very useful tool for maintenance on this trucks and most of the work I've done so far has gone smooth.

Quote:
Originally Posted by Green XJ Jeep View Post
Sounds like normal maintenance stuff even on a jy d30.
The only real benefit to getting another d30 is that you can throw it on some stands and re build it at your leasure.
Right, just curious if I'm better off going with a different axle all together or just find a decent D30 and rebuilt that, then swap it in. Or run it and rebuild the one on the truck. Just looking for a direction to go in.

Can I use a HPD30 from anything else other than a XJ?
Reply With Quote
  #6  
Old August 22nd, 2017, 07:06
VAhasnoWAVES VAhasnoWAVES is offline
NAXJA Forum User
 
Join Date: Sep 2008
Location: Lake City, Mi
Posts: 5,375
Re: Front Axle Options

Quote:
Originally Posted by volumeknob View Post
I've read up on replacing those seals, ball joints and the ZJ steering upgrade. The good years for the Dana 44 axle shafts are 97-99, I think not sure. You're talking about the 5-760X U-joints I'm assuming on the later XJ's? youtube has been a very useful tool for maintenance on this trucks and most of the work I've done so far has gone smooth.



Right, just curious if I'm better off going with a different axle all together or just find a decent D30 and rebuilt that, then swap it in. Or run it and rebuild the one on the truck. Just looking for a direction to go in.

Can I use a HPD30 from anything else other than a XJ?
44 shafts do no good for you and your D30.
early model D30s with ABS all got 297 (spicer 760) joints.
im not sure what year the smaller joint was phased out, but the years 91 or 94 come to mind.
id be willing to wager your 98 has 297/spicer 760 size joints in it.

the rebuild you are talking about doing is nothing more than regular maintenance and is an saturday job at most with the axle still under the vehicle. there is very little need to replace it entirely... unless there is something catastrophically wrong with it or you just like scrap metal laying around your yard.

a non XJ HP D30 will not bolt in.
Reply With Quote
  #7  
Old August 22nd, 2017, 07:17
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Re: Front Axle Options

Quote:
Originally Posted by VAhasnoWAVES View Post
44 shafts do no good for you and your D30.
early model D30s with ABS all got 297 (spicer 760) joints.
im not sure what year the smaller joint was phased out, but the years 91 or 94 come to mind.
id be willing to wager your 98 has 297/spicer 760 size joints in it.

the rebuild you are talking about doing is nothing more than regular maintenance and is an saturday job at most with the axle still under the vehicle. there is very little need to replace it entirely... unless there is something catastrophically wrong with it or you just like scrap metal laying around your yard.

a non XJ HP D30 will not bolt in.
I'm sure it has the Spicer 760's due to the year alone, unless it's been messed with before I got it. I don't have ABS, I've confirmed that. Only real reason to replace would be to actually build up the other one, more than just maintenance items. So truss, locker, aftermarket outer seals, re-gear, full C clips, moly shafts, clean and paint. Thought about doing the WJ knuckle swap since my knuckles are toast where the drag link ties in. This would be a over the winter type project and swapping in a JY D30 just for better manners. Trying to keep it on the road and doing all this work would be easier with the axle off the truck.

Right, needs to be a HP D30. I was just curious if any other Jeep models have the same HP Dana 30 or if it needs to be an XJ.

Last edited by volumeknob; August 22nd, 2017 at 07:30.
Reply With Quote
  #8  
Old August 22nd, 2017, 08:17
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 8,768
Re: Front Axle Options

94-up are all the thicker u-joints, I would get those shafts if nothing else

If its a trail rig you can probably get away with cheap wheel bearings for a little while

Replace the seals and wheel it
__________________
.
my '91 beater rebuild
Reply With Quote
  #9  
Old August 22nd, 2017, 08:42
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Re: Front Axle Options

Quote:
Originally Posted by ehall View Post
94-up are all the thicker u-joints, I would get those shafts if nothing else

If its a trail rig you can probably get away with cheap wheel bearings for a little while

Replace the seals and wheel it
Reason I feel the U-joints are bad is because I have a constant chirping at low speed, seems to go away at any speed over 10-15 mph but sure sounds like a little birdie in there. I get some lovely clicking in 4 high too, especially when turning the wheels. Even in 2WD high I have plenty of drive line vibs / noise (humming, rock tumbler sound), so that could be the axle and/or driveshaft U-joints, the pinion and/or wheel bearings.
Reply With Quote
  #10  
Old August 22nd, 2017, 08:47
ehall's Avatar
ehall ehall is offline
NAXJA Member
 
Join Date: Dec 2007
Location: Southern Maryland
Posts: 8,768
Re: Front Axle Options

chirping is probably the driveshaft centering ball, you can get a rebuild kit from Denny's Driveshaft for pretty good price (new centering joint and u-joints), if there's not a lot of slop in the slip joint that's the best way to go
__________________
.
my '91 beater rebuild
Reply With Quote
  #11  
Old August 22nd, 2017, 09:00
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Re: Front Axle Options

Quote:
Originally Posted by ehall View Post
chirping is probably the driveshaft centering ball, you can get a rebuild kit from Denny's Driveshaft for pretty good price (new centering joint and u-joints), if there's not a lot of slop in the slip joint that's the best way to go
Alright cool, I found his site when I was looking for Spicer U-joints a few months back, he's got great prices. I'm sure taking the front shaft off completely and taking it for a spin would help determine if it's that shaft or not. I just did the hack and tap on the rear and that didn't change any vibs or sounds at all.
Reply With Quote
  #12  
Old August 22nd, 2017, 09:22
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 10,381
Re: Front Axle Options

With 33" tires you should also be looking at gears!
Reply With Quote
  #13  
Old August 22nd, 2017, 09:48
volumeknob volumeknob is offline
NAXJA Forum User
 
Join Date: Jul 2017
Location: MI
Posts: 88
Re: Front Axle Options

Quote:
Originally Posted by RCP Phx View Post
With 33" tires you should also be looking at gears!
I am, stated that already. Another reason to find another D30 and build that one or swap it in and build the one that's on my truck now.
Reply With Quote
  #14  
Old August 22nd, 2017, 10:24
Green XJ Jeep Green XJ Jeep is offline
NAXJA Member 4950
 
Join Date: Mar 2011
Location: Spanaway Wa
Posts: 355
Re: Front Axle Options

Quote:
Originally Posted by volumeknob View Post
Right, just curious if I'm better off going with a different axle all together or just find a decent D30 and rebuilt that, then swap it in. Or run it and rebuild the one on the truck. Just looking for a direction to go in.

Can I use a HPD30 from anything else other than a XJ?
The only benefit to getting a jy axle is that you can take your time and rebuild it as your budget and time allows then swap it in.
We have all had projects take longer than expected and only you know whats acceptable for how long your jeep can potentially be laid up
XJ, MJ, TJ, and ZJ will interchange. ZJ's are low pinion
Reply With Quote
  #15  
Old August 22nd, 2017, 10:40
mcguyver_xj's Avatar
mcguyver_xj mcguyver_xj is offline
NAXJA Forum User
 
Join Date: Apr 2010
Location: Grandby, MA
Posts: 927
Re: Front Axle Options

Quote:
Originally Posted by Green XJ Jeep View Post
The only benefit to getting a jy axle is that you can take your time and rebuild it as your budget and time allows then swap it in.
We have all had projects take longer than expected and only you know whats acceptable for how long your jeep can potentially be laid up
XJ, MJ, TJ, and ZJ will interchange. ZJ's are low pinion
tj is low pinion as well
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
front axle swap options ? xj-krawler88 Modified Tech Discussion 10 April 10th, 2011 07:26
Pre-Made/Custom Front Axle Options? spinaldex Modified Tech Discussion 2 April 6th, 2009 21:22
Front axle options... rcmf5525 Modified Tech Discussion 19 January 22nd, 2008 15:22
Contemplating Front Axle Options FitchVA Modified Tech Discussion 12 June 9th, 2006 22:19
front axle options... allthingsoffroad Modified Tech Discussion 15 October 18th, 2005 06:50


All times are GMT -7. The time now is 20:44.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014