What axle do I have? - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 09-22-2013, 03:45 PM   #1
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
What axle do I have?

I have a 93 YJ and I'm wondering if my front Dana 30 is low pinion or high pinion.
How can I tell if it's lp or hp?

luv2bmx22 is offline   Quote
Old 09-22-2013, 04:13 PM   #2
Jeeper
 
AllMudd's Avatar
 
Join Date: Apr 2013
Location: SoCal
Posts: 1,610
Take a pic and post it. But if the pinion is coming from the top of the housing, it's high pinion. And opposite for low pinion.

AllMudd is offline   Quote
Old 09-22-2013, 06:15 PM   #3
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
I got some pictures of the axle. It's not taken apart or anything, so i hope there is a way to tell without taking it apart. Sorry it's kinda dim, i couldn't find my work light.
Attached Thumbnails
Click image for larger version

Name:	0922131908a.jpg
Views:	93
Size:	137.9 KB
ID:	369761   Click image for larger version

Name:	0922131908.jpg
Views:	79
Size:	131.6 KB
ID:	369769  

Click image for larger version

Name:	0922131907.jpg
Views:	86
Size:	130.7 KB
ID:	369777  
luv2bmx22 is offline   Quote
Old 09-22-2013, 06:17 PM   #4
Jeeper
 
AllMudd's Avatar
 
Join Date: Apr 2013
Location: SoCal
Posts: 1,610
Looks like high pinion to me. But yea it's kinda dark there.
AllMudd is offline   Quote
Old 09-22-2013, 06:23 PM   #5
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
Thanks a lot! Sorry for the darkness again - the tools I need (my light) are the ones missing - I'm sure you know what it's like haha.
luv2bmx22 is offline   Quote
Old 09-22-2013, 06:27 PM   #6
Jeeper
 
YJ fanatic's Avatar
 
Join Date: Nov 2012
Location: White Cloud, Michigan
Posts: 1,081
That's high pinion. I think all YJs came with the high pinion 30. TJs, later XJs, and I think the Grand Cherokees were the only ones with a low pinion 30.
__________________
92 YJ, 4.0, D44/60, 5" BDS springs rear, SOA front, 1" booms, 1" BL, 35x12.50x15 MTZ's, 4.10 gears. It's never done though.
YJ fanatic is online now   Quote
Old 09-22-2013, 06:50 PM   #7
Jeeper
 
jagular7's Avatar
 
Join Date: Sep 2013
Posts: 43
High pinion represents the pinion is located higher than the centerline of the housing in the housing.

YJs came stock with the Dana30 front axle with high pinion.
TJs came stock with the Dana30 front axle with low pinion.

If you crawl underneath both for a comparison, you'll see the difference for the pinion location.

From the pics, I've got a feeling you don't understand what a pinion and housing are. Am I wrong?
jagular7 is offline   Quote
Old 09-22-2013, 07:10 PM   #8
Jeeper
 
Speedy4x4's Avatar
 
Join Date: Aug 2012
Location: Oregon
Posts: 1,025
Why did TJ's go low pinion?
Speedy4x4 is offline   Quote
Old 09-22-2013, 09:22 PM   #9
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
Quote:
Originally Posted by jagular7 View Post
High pinion represents the pinion is located higher than the centerline of the housing in the housing.

YJs came stock with the Dana30 front axle with high pinion.
TJs came stock with the Dana30 front axle with low pinion.

If you crawl underneath both for a comparison, you'll see the difference for the pinion location.

From the pics, I've got a feeling you don't understand what a pinion and housing are. Am I wrong?
You're right, I don't know exactly what it is. I was assuming it has something to do with gearing, but wasn't sure. I also heard that the high pinion D30s are somewhat stronger than the LP D30
luv2bmx22 is offline   Quote
Old 09-22-2013, 11:15 PM   #10
Jeeper
 
jagular7's Avatar
 
Join Date: Sep 2013
Posts: 43
Without understanding the terms for the front axle, the description or phrase 'somewhat stronger' is a relative term to those speaking it and those receiving it. IE, believe the President on his statements....lol.

The rotation of the ring gear relative to the pinion is what makes it 'stronger'. Its relative to speaking on the coast side vs drive side of the ring gear itself.

For a stock front axle, there is really nothing 'stronger' about them. They are designed to work with stock components - driveline, tire size, vehicle weight capacity, etc. I run a XJ high pinion front axle in my TJ. Only thing that doesn't share between them is the r&p.

Don't be afraid to ask questions like this. See if there is a local 4wd club near you. Look to join. Many perform their own work on their vehicles. Its a great place to touch, feel, learn and help out. Its like a free class. Many will accept your help, teach you, etc.

TJs went to low pinion because of cost, availability, design, clearance, etc. The basic drive for mass assembly of vehicles is cost and availability of its components and the ease of assembly.
jagular7 is offline   Quote
Old 09-22-2013, 11:52 PM   #11
Jeeper
 
jagular7's Avatar
 
Join Date: Sep 2013
Posts: 43
Here is a little video to understand differentials.

How Differential Gear works (BEST Tutorial) - YouTube
jagular7 is offline   Quote
Old 09-23-2013, 12:03 AM   #12
Jeeper
 
Wombat Ranger's Avatar
 
Join Date: Sep 2013
Location: Bonney Lake, WA
Posts: 618
Where the driveshaft meets the axle housing is a U-joint. On the axle side of this ujoint is the pinion yoke. The yoke bolts to the pinion gear. The pinion gear is inside the axle, not externally visible. You can see from your pictures that the "tube" cast into the housing where the u-joint meets the yoke is on the top side of the differential housing. Now go look at your rear axle. See how the pinion yoke is on the bottom side of the differential housing? That means it is a low pinion axle. Because of the rotation of the driveshaft relative to the differential it is driving, rear differentials are stronger in a low pinion configuration, and front axles are stronger in the high pinion configuration.
__________________
'88 YJ 4.6L stroker/AX15
Stroker Thread
Wombat Ranger is offline   Quote
Old 09-23-2013, 09:25 AM   #13
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
Quote:
Originally Posted by jagular7 View Post
Here is a little video to understand differentials.

How Differential Gear works (BEST Tutorial) - YouTube
I've seen this video a while back. I know how a differential works, I'm just bad at naming the parts. The reason I was wondering what pinion I have is because I read in a 4wheeler magazine that high pinion is better than low pinion. I am going to throw in an Aussie lunchbox locker in the front D30 and wanted to be sure the axle could handle the torque (It's only a 4i, but when all the weight is on one wheel I hear it could get ugly).

Thanks a lot for explaining everything!
luv2bmx22 is offline   Quote
Old 09-23-2013, 09:29 AM   #14
Jeeper
 
luv2bmx22's Avatar
 
Join Date: Sep 2012
Location: West Branch, MI
Posts: 96
Quote:
Originally Posted by Wombat Ranger View Post
Where the driveshaft meets the axle housing is a U-joint. On the axle side of this ujoint is the pinion yoke. The yoke bolts to the pinion gear. The pinion gear is inside the axle, not externally visible. You can see from your pictures that the "tube" cast into the housing where the u-joint meets the yoke is on the top side of the differential housing. Now go look at your rear axle. See how the pinion yoke is on the bottom side of the differential housing? That means it is a low pinion axle. Because of the rotation of the driveshaft relative to the differential it is driving, rear differentials are stronger in a low pinion configuration, and front axles are stronger in the high pinion configuration.
Okay, that makes sense now. I have experience with the rear differential, but have never messed with the front (except for some lubing and greasing). Thanks for explaining that to me. And I thought I knew everything about the differentials LOL.
luv2bmx22 is offline   Quote
Old 09-24-2013, 09:16 AM   #15
Jeeper
 
jagular7's Avatar
 
Join Date: Sep 2013
Posts: 43
I wouldn't worry about putting a locker into the D30 front axle in the wrangler. I would only be concerned when running much bigger and heavier tires/wheels.

There is a grey area of no-issue for breaking components with bigger tires, but its driver input, weight shift, obstacle/terrain, etc.

jagular7 is offline   Quote
Reply

Tags
axle , dana 30

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 11:32 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC