1” MML and new track bar—do I need a new front track bar?

I was debating updating gears to 4.88s but I have the 4.0 and manual and she doesn’t struggle on the highway so I don’t feel I really need to at this point.
Re-gearing (or correcting the gear ratio after moving to a larger tire) is one of the best investments you can make to your TJ. You often don't realize you needed it until you've had it done. Then you find yourself asking "why didn't I do this a lot sooner?"
 
The original owner did all that and listed a parts list that had 4.10 gears. I am the 3rd owner and my neighbor had it for 4 years before I got it. It was running 35’s before my neighbor bought it and traded those after his stroke.

It does have the 44 in the rear which was an option as of July 97. I assumed the 4.10 and lsd was as well but if you say that wasn’t an option back then then he must have added later.
Not to be "that guy" but did you verify the 4.10 ratio? Or did the PO just tell you that's what it has? 4.10 is not the correct ratio for 35" tires. It just seems like wasted time/ money to re-gear and not go with the correct set-up.
 
Re-gearing (or correcting the gear ratio after moving to a larger tire) is one of the best investments you can make to your TJ. You often don't realize you needed it until you've had it done. Then you find yourself asking "why didn't I do this a lot sooner?"
It doesn’t struggle to turn them for the trails I do or on the highway so for me it’s not a pressing matter currently. At some point, yes, but there are just other mods to solidify and upgrade that take precedence for me currently.
 
  • Like
Reactions: SvtLdr
It doesn’t struggle to turn them for the trails I do or on the highway so for me it’s not a pressing matter currently. At some point, yes, but there are just other mods to solidify and upgrade that take precedence for me currently.
I hear ya and was in the same boat for a long time. We put up with things that we can live with because there's always something else we can spend our hard-earned money on!
 
Not to be "that guy" but did you verify the 4.10 ratio? Or did the PO just tell you that's what it has? 4.10 is not the correct ratio for 35" tires. It just seems like wasted time/ money to re-gear and not go with the correct set-up.
No I haven’t yet. I’m going to do the driveshaft estimate thing later this morning. I was planning to pull the diff covers this spring and have them serviced before I start hitting the trails more. He may have upgraded shafts, I just don’t know until we look in there. Every other item he listed has been true.
 
  • Like
Reactions: SvtLdr
I think that unless I can get extremely lucky and with a limited slip or electronic locker, I will just wait. If I’m going to spend more than $500 putting a locker on a Dana 30 I might as well spend the extra money and be patient and shop around for a dana 44 w/locker swap and invest in more $ into that.
 
Would this be something that would work?
752B29EE-6D19-4BCA-9E09-0C8CF5914C5D.jpg
 
The best reason to have centered axles is to not introduce an extra angle in the driveline. A really good driveline shop taught me that. Made sense to me. But so does Stephen Wright.
 
  • Haha
Reactions: TheBoogieman
Would this be something that would work? View attachment 237083
Yes, that would work. However, an auto locker (aka lunch box locker) like the Spartan is a different animal. Make sure you understand the differences between auto locker, selectable locker and limited slip before you dive in.
 
Yes, that would work. However, an auto locker (aka lunch box locker) like the Spartan is a different animal. Make sure you understand the differences between auto locker, selectable locker and limited slip before you dive in.
I definitely don’t want an auto “lunchbox” locker.
 
I definitely don’t want an auto “lunchbox” locker.
To each his own. There are plenty of folks running them with good experiences to report. I personally really like my Eaton E-lockers (selectable full-case lockers).
 
  • Like
Reactions: TheBoogieman
To each his own. There are plenty of folks running them with good experiences to report. I personally really like my Eaton E-lockers (selectable full-case lockers).
I just drive mine around town a lot. 80/20 on/off road. So from what I’ve gathered, a full time auto locker wouldn’t be what I’m looking for. A selectable air or e-locker would work but given the price and the fact I’m running a Dana 30 up front, it doesn’t make much sense. So I guess that leaves me with a limited slip as most logical option if I’m going to do anything to my Dana 30.
 
Last edited:
  • Like
Reactions: TheBoogieman
I just drive mine around town a lot. 80/20 on/off road. So from what I’ve gathered, a full time auto locker wouldn’t be what I’m looking. A selectable air or e-locker would work but given the price and the fact I’m running a Dana 30 up, it doesn’t make much sense. So that leaves me with a limited slip as most logical option if I’m going to do anything to my Dana 30.
The Dana 30 front is never an issue with a locker, a Dana 35 rear axle is.
P.S. If you don't need a locker, don't buy one.
 
Keep in mind that an auto locker is not a full time locker (like a spool).

I'm curious why it doesn't make sense to invest in your Dana 30? Are you planning to change to a different front axle at some point?

The question you really need to ask yourself is "What kind of performance are you looking for from an upgraded differential?" What type of wheeling are you into or looking to tackle?
 
I just drive mine around town a lot. 80/20 on/off road. So from what I’ve gathered, a full time auto locker wouldn’t be what I’m looking for. A selectable air or e-locker would work but given the price and the fact I’m running a Dana 30 up front, it doesn’t make much sense. So I guess that leaves me with a limited slip as most logical option if I’m going to do anything to my Dana 30.
I don't know where you heard that but a full locker is a problem with the Dana 30. You can do some research on the differences between the Dana 30 and the front Rubicon Dana 44 and see why.
 
Last edited:
Keep in mind that an auto locker is not a full time locker (like a spool).

I'm curious why it doesn't make sense to invest in your Dana 30? Are you planning to change to a different front axle at some point?

The question you really need to ask yourself is "What kind of performance are you looking for from an upgraded differential?" What type of wheeling are you into or looking to tackle?
My internal debate is like this...“can I spend $300-$500 and throw a budget locker/limited slip in the front that will make it more capable and allow me to tackle some more aggressive trail but won’t negatively affect on-road drivability? If not, I might as well look to spend $1000+ and shop around for a potential dana 44 from a scrap yard or something.
 
Again, what specific obstacles/ terrain are you looking to conquer. I'd recommend NOT spending money on an upgraded front differential (of any kind) until you have a solid answer to that question. Get out there and wheel your Jeep, have fun with it. Until you've found a trail or an obstacle that you cannot overcome with your current setup, you don't NEED to upgrade anything. In fact, you may be amazed at how capable your Jeep is in its current state.
 
My internal debate is like this...“can I spend $300-$500 and throw a budget locker/limited slip in the front that will make it more capable and allow me to tackle some more aggressive trail but won’t negatively affect on-road drivability? If not, I might as well look to spend $1000+ and shop around for a potential dana 44 from a scrap yard or something.
for 80/20 - on/off road; and a maximun of 35" tires, there's no reason not to dump the money into the dana 30 and get the locker you really want, plus the other upgrades.
I don't know what kind of trails are in OK, but if you're just doing some easy/moderate trail riding you would be good to go.

I've had the factory LSD rear and open front for years and it's been a blast with very few winching moments, and most of those where snow. But I'm also not rock crawling.
 
  • Like
Reactions: SvtLdr