--- axles question --- locked and open ---
Senior Member
Joined: Jul 2014
Posts: 793
Likes: 2
From: St. Louis
Year: 1998
Model: Cherokee
Engine: 4.0 Liter I6 PowerTech
Our XJ is a DD on the street. The PowerTrax No-Slip is almost as invisible as a clutch type LSD.
With any traction enhanced diff on slick pavement u can't drive with SFB syndrome. Be smart/behave oneself and the torque of both wheels driving is way better than a one tire fire. Most auto lockers ratchet/click in a turn......the PowerTrax No-Slip is the only auto locker, that I'm aware of, that makes no noise in a turn. Install is easy....there's no ring/pinion set-up required.
Auto lockers r always locked, except in a tight turn. In a turn, they unlock and allow axles to differentiate. As soon as both wheels r turning the same speed, they lock.
With any traction enhanced diff on slick pavement u can't drive with SFB syndrome. Be smart/behave oneself and the torque of both wheels driving is way better than a one tire fire. Most auto lockers ratchet/click in a turn......the PowerTrax No-Slip is the only auto locker, that I'm aware of, that makes no noise in a turn. Install is easy....there's no ring/pinion set-up required.
Auto lockers r always locked, except in a tight turn. In a turn, they unlock and allow axles to differentiate. As soon as both wheels r turning the same speed, they lock.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Sounds like u got your info about auto lockers from someone that's clueless about auto lockers. Look again at my pic....it's in the fully locked position in the pic. How can a diff be locked in a turn?......it can't, it has to differentiate in a turn which means it has to unlock a turn. It locks when both wheels turn at equal speeds.
Any vehicle with a traction enhanced diff (LSD or locker) will tend to fishtail when both wheels loose traction on slick pavement. Again, u can't drive with SFB syndrome on slick pavement, especially when the vehicle has a traction enhanced diff of whatever kind.
Any vehicle with a traction enhanced diff (LSD or locker) will tend to fishtail when both wheels loose traction on slick pavement. Again, u can't drive with SFB syndrome on slick pavement, especially when the vehicle has a traction enhanced diff of whatever kind.
Last edited by djb383; Dec 8, 2014 at 10:36 PM.
CF Veteran
Joined: Jan 2014
Posts: 1,532
Likes: 349
From: District of Columbia
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
Sounds like u got your info about auto lockers from someone that's clueless about auto lockers. Look again at my pic....it's in the fully locked position in the pic. How can a diff be locked in a turn?......it can't, it has to differentiate in a turn which means it has to unlocking a turn. It locks when both wheels turn at equal speeds.
Any vehicle with a traction enhanced diff (LSD or locker) will tend to fishtail when both wheels loose traction on slick pavement. Again, u can't drive with SFB syndrome on slick pavement, especially when the vehicle has a traction enhanced diff of whatever kind.
Any vehicle with a traction enhanced diff (LSD or locker) will tend to fishtail when both wheels loose traction on slick pavement. Again, u can't drive with SFB syndrome on slick pavement, especially when the vehicle has a traction enhanced diff of whatever kind.
Edit: Here's the video. I just rewatched it and realized my mistake. As the outside wheel follows a longer arc than the inside, the torque on that side of the diff is low, allowing that side to decouple. Makes sense now.
Last edited by IJM; Dec 8, 2014 at 10:48 PM.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
If u r on dry pavement, it is going to unlock in a turn.....one usually lifts on the skinny pedal when entering a turn, regardless of what kind of diff they have, right? It unlocks while in the turn and locks when both wheels r turning at equal speed. If u hammer down in a turn, the inside wheel will loose traction and as soon as that inside wheel equals the speed of the outside wheel, the unit locks.
Last edited by djb383; Dec 8, 2014 at 10:48 PM.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
LOL, I just realized what you meant by SFB syndrome. The info I was thinking of was a video showing the internal operating of the PowerTrax or other lunchbox locker. What I remember is that the teeth would only uncouple when the power wasn't being applied, or at least not heavily. Let me see if I can dig up that video.
Edit: Here's the video. I just rewatched it and realized my mistake. As the outside wheel follows a longer arc than the inside, the torque on that side of the diff is low, allowing that side to decouple. Makes sense now.
https://www.youtube.com/watch?v=kL0hPEOStGk
Edit: Here's the video. I just rewatched it and realized my mistake. As the outside wheel follows a longer arc than the inside, the torque on that side of the diff is low, allowing that side to decouple. Makes sense now.
https://www.youtube.com/watch?v=kL0hPEOStGk
If u want the silent, no ratcheting/no clicking in a turn auto locker, it's got to be the PowerTrax No-Slip unit. The Lock Right unit ratchets/clicks in a turn.
Again, SFB syndrome driving on ANY slick surface with ANY type of traction enhanced diff will likely end up with the vehicle fishtailing.
Last edited by djb383; Dec 8, 2014 at 11:16 PM.
CF Veteran
Joined: Jul 2013
Posts: 7,554
Likes: 17
From: Monett, MO.
Year: 1999
Model: Cherokee
Engine: 4.0
To the OP if possible sell the D35 for as close to what you paid for it as possible (hopefully). Then go with a Chy 8.25 29 spline locked at least twice as strong differential if not more and cheap. I have Detroit Lockers in my D30/Chy 8.25 and love it very quiet and very strong, dependable.
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