410-513s
JK Junkie
Joined: Oct 2008
Posts: 2,118
Likes: 1
From: Twain Harte, CA
The pinion gets TINY. Its significantly weaker than a 4.10 gear set. If you look around a bit on here, you will come across several post of people blowing their 5.13 gear sets. I still stand by not going lower than 4.56's with a D44.
Here are the tooth counts (these do vary by manufacturer):
4.10
Ring: 41
Pinion: 10
4.56
Ring: 50
Pinion: 11
4.88
Ring: 39
Pinion: 8
5.13
Ring: 41
Pinion: 8
And, here is a photo of a factory JK 4.10 next to a 4.88:
Here are the tooth counts (these do vary by manufacturer):
4.10
Ring: 41
Pinion: 10
4.56
Ring: 50
Pinion: 11
4.88
Ring: 39
Pinion: 8
5.13
Ring: 41
Pinion: 8
And, here is a photo of a factory JK 4.10 next to a 4.88:
JK Junkie
Joined: Dec 2008
Posts: 2,355
Likes: 0
From: San Diego
I don't recall reading many, if any, failures of properly installed 5.13s. Where are all these posts of properly installed 5.13s blowing?
In fact, when WOL had his catastrophic front axle failure, his chromoly front axle shafts failed prior to his 5.13 gears. When he had rear axle failures, the stock Rubi locker failed before his 5.13 gears.
Chromoly axle shafts and stock Rubi lockers are weaker than properly installed 5.13 gears.
We just pulled the 5.13s out of my wife's 4 dr Rubi on 37s to install 5.38s--without any hesitation.
In fact, when WOL had his catastrophic front axle failure, his chromoly front axle shafts failed prior to his 5.13 gears. When he had rear axle failures, the stock Rubi locker failed before his 5.13 gears.
Chromoly axle shafts and stock Rubi lockers are weaker than properly installed 5.13 gears.
We just pulled the 5.13s out of my wife's 4 dr Rubi on 37s to install 5.38s--without any hesitation.
JK Junkie
Joined: Oct 2008
Posts: 2,118
Likes: 1
From: Twain Harte, CA
I don't recall reading many, if any, failures of properly installed 5.13s. Where are all these posts of properly installed 5.13s blowing?
In fact, when WOL had his catastrophic front axle failure, his chromoly front axle shafts failed prior to his 5.13 gears. When he had rear axle failures, the stock Rubi locker failed before his 5.13 gears.
Chromoly axle shafts and stock Rubi lockers are weaker than properly installed 5.13 gears.
We just pulled the 5.13s out of my wife's 4 dr Rubi on 37s to install 5.38s--without any hesitation.
In fact, when WOL had his catastrophic front axle failure, his chromoly front axle shafts failed prior to his 5.13 gears. When he had rear axle failures, the stock Rubi locker failed before his 5.13 gears.
Chromoly axle shafts and stock Rubi lockers are weaker than properly installed 5.13 gears.
We just pulled the 5.13s out of my wife's 4 dr Rubi on 37s to install 5.38s--without any hesitation.
This is one of the rears people go with Ford 9's in TJ's in back, it has a pinion support and a huge pinion compared to a D44. Its also one of the biggest things you gain when going with a D60.
EDIT:
TrailBud breaking his: http://www.youtube.com/watch?v=AOrY8roQ774
Last edited by Stuka; Mar 12, 2010 at 09:56 PM.
JK Enthusiast
Joined: Apr 2009
Posts: 382
Likes: 0
From: VEGAS
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
WOL has gone through two sets of rear R&P's.
I'd suggest qualifying any of the people blowing up gears, taking into account any other circumstances involved. Hemi? Lead foot in the rocks? Pushing 40+ inch tires?
Personally, I wouldn't compare someone with 35's, a stock engine and a light foot blowing up gears to someone with a hemi and 42's. A mild build and a light foot, and you shouldn't need to worry much about the gears. Big tires and romping up through the rocks, and ...