For more visibility, my two comments from another thread inserted here. Please see my latest Update post at the bottom.
Thanks, J.
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Gearing Advice Please!!!
My non XR 392 w/3.73 gears is at the dealership now. Swung by last night and they said to leave it and they would take a look at it today. My rear electronic locker messed up (I Think). It was making a clucking noise only when turning at slow speeds and when switching on/engaging 4 low it does not mechanically engage. The idiot light came on as well.
Anyways, the service manager said that sometimes when the e-locker fails they have to replace more than just the locker. They may have to replace the gears... and sometimes the entire axle, dependent upon how much damage 'spread around' inside the housing. Makes sense if the locker's components are getting smashed in between the ring and pinion and other moving parts. I mentioned if they have to replace the rear gearing, which is covered under warranty, what would it cost/take to swap the rear gearing out to 4.56 (which they may be able to 'slip-in-there' to be warranty covered), but then to also replace the front gears to 4.56 as well?
My assumption is the rear gear replacement (if they say it's required) should be at a near zero cost as it's warranty work and I can't imagine that much of a difference in cost between 3.73s and 4.56. Of course I'd have to pay for the front.
With that I got to thinking. I run 35" tires and I do haul a ~3500lb camper trailer from time to time. I'm not sure I'd ever go larger than 35" tires, but if I ever went to 37s let's hear your advice on the below...
Knowing that I do haul, with 35" tires would y'all go to 4.56 gears or perhaps 4.88? What if I went to 37" down the road and I wanted to be haul/gear ready? Would the 4.56s be good enough or should I go to 4.88s?
Perhaps for now let me stay in my current world. With 35" tires would you select 4.56 or 4.88 gears?
Also, anyone know what it might roughly cost to have the front gears done?
I know the dealership will probably cost more than a private shop, but I want to maintain the warranty.
Thank You All for any advice.
~justin
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Update:
Here's where I'm at...
I have a 2021 non XR 392 with 35" tires and I tow a 21 foot ~3,500lbs camper trailer monthly. I mention that because the camper has wind drag, it's not the weight so much. The 4.56 gearing will help alleviate powertrain strain.
I'm attempting to be very detailed here because I'm hoping someone may have a suggestion on Mopar 4.56 gearing...
The rear locker was fried. My intent was to have the dealership replace only the locker and I'd be done with it, it'd be fixed and it would have the original 3.73 gears. My initial request, before they opened the differential, was IF they had to replace the differential or gears because of the defective e-locker's collateral damage then to put in 4.56s (I'd pay the difference in the warranty work covering the rear end, if there was any, and of course I'd come out of pocket to have the gearing installed up front). My thought, If they did the work and installed Mopar parts I'd retain warranty coverage and it'd only cost me half as much only paying for the front gears.
Visiting the dealership the next day, the dealership was not able to find 4.56 gears (the ring & pinion set by itself OR a differential assembly w/4.56) in their system for a 2021. They found 4.10s for a 2022 but their system (the parts guy) said since these gears were referenced to a 2022 axle model they may not fit in a 2021 axle housing. As they were uncertain if 2022 4.10s would fit a 2021, they were not willing to chance other gears fitting a 2021 axle as well.
(((Personal thought. I'm not sure I believe there's a difference in the 2021 vs 2022 axles, perhaps their system did not find the gears because Mopar is out of stock on 4.56 gears, I think an unlikely reason though. Or perhaps user error not finding them in the system [all due respect-great guys & gals working there]. Anyways, who knows... Obviously, I don't want the 4.10s, the whole purpose was to see if other gears would actually fit the 2021. And in all fairness the only 392 the service members have worked is mine, there's no hands-on shop experience/knowledge regarding the 392 of any year.)))
Due to a shortage on individual parts e.g. the actual e-locker, and due to a shortage on differentials, they are replacing the entire axle assembly. Gasp! What? Just craziness. And that's with the 3.73 gears, obviously. I could buy both front & rear 4.10 axle assemblies for ~ $9k, but that's not going to happen AND no one could tell me if 2022 axles would even fit. Regardless, I'm not paying ~9k nor do I want 4.10s.
The dealership said IF I was able to do my research and found/bought Mopar 4.56 gears separately they would charge me only for the front & rear install to include updating the PCM and I'd retain warranty.
Like the parts guy, I'm unable to find 4.56 Mopar gears for a 392 which has the WIDE D44 axles. Does anyone know the Mopar part numbers for front and rear 4.56 gearing that'll fit a 2021 non XR 392? My concern, I buy 4.56 gears for a Rubicon but those gears end up not fitting the Rubicon 392's Wide D44 axles.
The link below displays 4.56 gearing for a 392; however, since it's not Mopar I chance losing my powertrain warranty coverage if I have them installed. I'll also include some pics of the defective e-locker and the quote which displays the part number for both the front & rear wide axle housings, the 3.73 gearing for a 2021 392 which is what's currently on my Jeep. This so there's a reference point if anyone knows if/what Mopar 4.56 gears will fit it. That's now my intent, just buy the front & rear Mopar gearing and have the dealership perform the install.
In a worst-case scenario I buy non-Mopar gearing and potentially forfeit my remaining warranty. If it saves my transmission 5 years down the road, then perhaps it's worth it.
Thanks All for any positive input.
~justin
Dana 4.56 Rubicon Dana 44 210MM/220MM Gear Package; Wrangler JL with Master Install (rubitrux.com)
Thanks, J.
_____________________________________________________________________________________________________________________
Gearing Advice Please!!!
My non XR 392 w/3.73 gears is at the dealership now. Swung by last night and they said to leave it and they would take a look at it today. My rear electronic locker messed up (I Think). It was making a clucking noise only when turning at slow speeds and when switching on/engaging 4 low it does not mechanically engage. The idiot light came on as well.
Anyways, the service manager said that sometimes when the e-locker fails they have to replace more than just the locker. They may have to replace the gears... and sometimes the entire axle, dependent upon how much damage 'spread around' inside the housing. Makes sense if the locker's components are getting smashed in between the ring and pinion and other moving parts. I mentioned if they have to replace the rear gearing, which is covered under warranty, what would it cost/take to swap the rear gearing out to 4.56 (which they may be able to 'slip-in-there' to be warranty covered), but then to also replace the front gears to 4.56 as well?
My assumption is the rear gear replacement (if they say it's required) should be at a near zero cost as it's warranty work and I can't imagine that much of a difference in cost between 3.73s and 4.56. Of course I'd have to pay for the front.
With that I got to thinking. I run 35" tires and I do haul a ~3500lb camper trailer from time to time. I'm not sure I'd ever go larger than 35" tires, but if I ever went to 37s let's hear your advice on the below...
Knowing that I do haul, with 35" tires would y'all go to 4.56 gears or perhaps 4.88? What if I went to 37" down the road and I wanted to be haul/gear ready? Would the 4.56s be good enough or should I go to 4.88s?
Perhaps for now let me stay in my current world. With 35" tires would you select 4.56 or 4.88 gears?
Also, anyone know what it might roughly cost to have the front gears done?
I know the dealership will probably cost more than a private shop, but I want to maintain the warranty.
Thank You All for any advice.
~justin
__________________________________________________________________________________________________________________________
Update:
Here's where I'm at...
I have a 2021 non XR 392 with 35" tires and I tow a 21 foot ~3,500lbs camper trailer monthly. I mention that because the camper has wind drag, it's not the weight so much. The 4.56 gearing will help alleviate powertrain strain.
I'm attempting to be very detailed here because I'm hoping someone may have a suggestion on Mopar 4.56 gearing...
The rear locker was fried. My intent was to have the dealership replace only the locker and I'd be done with it, it'd be fixed and it would have the original 3.73 gears. My initial request, before they opened the differential, was IF they had to replace the differential or gears because of the defective e-locker's collateral damage then to put in 4.56s (I'd pay the difference in the warranty work covering the rear end, if there was any, and of course I'd come out of pocket to have the gearing installed up front). My thought, If they did the work and installed Mopar parts I'd retain warranty coverage and it'd only cost me half as much only paying for the front gears.
Visiting the dealership the next day, the dealership was not able to find 4.56 gears (the ring & pinion set by itself OR a differential assembly w/4.56) in their system for a 2021. They found 4.10s for a 2022 but their system (the parts guy) said since these gears were referenced to a 2022 axle model they may not fit in a 2021 axle housing. As they were uncertain if 2022 4.10s would fit a 2021, they were not willing to chance other gears fitting a 2021 axle as well.
(((Personal thought. I'm not sure I believe there's a difference in the 2021 vs 2022 axles, perhaps their system did not find the gears because Mopar is out of stock on 4.56 gears, I think an unlikely reason though. Or perhaps user error not finding them in the system [all due respect-great guys & gals working there]. Anyways, who knows... Obviously, I don't want the 4.10s, the whole purpose was to see if other gears would actually fit the 2021. And in all fairness the only 392 the service members have worked is mine, there's no hands-on shop experience/knowledge regarding the 392 of any year.)))
Due to a shortage on individual parts e.g. the actual e-locker, and due to a shortage on differentials, they are replacing the entire axle assembly. Gasp! What? Just craziness. And that's with the 3.73 gears, obviously. I could buy both front & rear 4.10 axle assemblies for ~ $9k, but that's not going to happen AND no one could tell me if 2022 axles would even fit. Regardless, I'm not paying ~9k nor do I want 4.10s.
The dealership said IF I was able to do my research and found/bought Mopar 4.56 gears separately they would charge me only for the front & rear install to include updating the PCM and I'd retain warranty.
Like the parts guy, I'm unable to find 4.56 Mopar gears for a 392 which has the WIDE D44 axles. Does anyone know the Mopar part numbers for front and rear 4.56 gearing that'll fit a 2021 non XR 392? My concern, I buy 4.56 gears for a Rubicon but those gears end up not fitting the Rubicon 392's Wide D44 axles.
The link below displays 4.56 gearing for a 392; however, since it's not Mopar I chance losing my powertrain warranty coverage if I have them installed. I'll also include some pics of the defective e-locker and the quote which displays the part number for both the front & rear wide axle housings, the 3.73 gearing for a 2021 392 which is what's currently on my Jeep. This so there's a reference point if anyone knows if/what Mopar 4.56 gears will fit it. That's now my intent, just buy the front & rear Mopar gearing and have the dealership perform the install.
In a worst-case scenario I buy non-Mopar gearing and potentially forfeit my remaining warranty. If it saves my transmission 5 years down the road, then perhaps it's worth it.
Thanks All for any positive input.
~justin
Dana 4.56 Rubicon Dana 44 210MM/220MM Gear Package; Wrangler JL with Master Install (rubitrux.com)
