Jeep Wrangler Rubicon 392 Essential Mods & Upgrades | Inside Line

In this video, I'll cover the weak links on the Jeep Wrangler Rubicon 392, along with some key upgrades that will make yours drive better on-road and off.

00:00 Introduction
00:13 Transfer Case Mod
02:41 Control Arms
03:30 Suspension Upgrades
07:40 Exhaust Mod
08:36 Bumper Upgrades
10:02 Stubby antenna
10:31 Axle Upgrades
12:49 Wrap up

[xthelast]

I have a MY 2023 JLUXR daily 37s on beadlocks and my balljoints are also still good at 24k miles. I’ve got the dynatracs on hand, but the OEM ones are still going strong.

[cmwilfred]

Love the idea of 2.5 Rear Bump Stops. Want to run the “24 392 on stock suspension and springs for a while but on “37 tires.

[Joes-Adventures]

You have the most useful info on my 392.i don't want to go crazy with expensive kits that are tens of thousands of dollars. Its pretty awesome from the factory. I just want to go from 35s to 37s and I'll be happy. The upgraded RCVs are high on my list because that 2 piece axle on the passenger side is silly.

[blakemarchand]

Hell yeah great video I like how the going fast in the desert part was towards me haha

[MrRjezonie]

Clayton lift with DSCs are a great combo! Also ditching the suitcase muffler helps a ton. Brakes should be Brembos, standard on a 392. Mine sucked. Upgrade was needed for sure!

[tomdeskins]

Thanks for all of the tips. Much appreciated !

[bencoyle]

I cannot stand the factory shocks that come on the 392. Fox 2.0”s are amazing, in fact, I have them on my lifted Ram 3500. They’re best when used for occasional off roading, but mostly on the road (so daily driver style). But when they’re put on a vehicle that’s made to be the best possible off roader from the ground up, and the people who buy a 392, 99% of the time they’re going to be driving them off road. Which isn’t what the Fox 2.0”s are made for. The Fox 2.5s and 3.0s are either the best or 2nd best off road shocks on the planet. And when it comes to off road racing (which is what the 392 is made for) they’re by far the best there is. Look what shocks come on vehicles like the Bronco Raptor, and F-150 Raptor/Raptor R, and Toyota Seqouia, Tacoma, 4Runner, and Tundra TRD Pros. They all use Fox 2.5s or 3.0s, why the hell does Jeep make this jeep $90, 000+ but stick shitty daily driver shocks? I just ordered a 392 final edition, and as soon as I get it I will be lifting it and putting FOX 3.0s on.

[JEEP-N-DIRT]

Great stuff but here's a watch out for all: With lift and constant spinning front drive shaft we MUST prioritize pinion angle over castor to prevent vibrations. In the case of the 392 and the standard JL the stock Rzeppa style drive shaft will absorb (mask) any driveline vibrations up to a certain amount of lift with improper pinion angle but when (not if) the jeep owner upgrades to a double cardan drive shaft then the pinion angle will become ever more important which means you'll be back in the lower castor numbers again. That presents other issues like the spring pads being rotated causing some degree of spring bow followed by bump stops not aligning with the pad. Us do it your self old school guys will simply remove the axle, cut the purches, cut the C's / rotate and re-weld everything but many mall crawlers and weekend warriors will pay to have it done, and that's were the $$ come into play. There's the option of upgrading the front axle and ordering with extra castor but again usually means $$'s It's not doom and gloom but just food for thought. Lift and big tires is NEVER just a budget lift and basic stuff. There's cause and effect that trickles down the line. It's part of jeep life. 😀 For me I've owned my YJ for 27 years and plan on owning my built JLUR for 27 or more. I know my long term plan and cost, but for the new every two folks I say make sure to do it right the first time. Please Please spend the money up front and do it right. Put the good stuff on. You create GREAT deals for the folks who buy 2 or 3 years used. Think of it like you're investing in the future. Lol.

[jdetermann]

Another great video. Liked and subscribed!

[bobbymuy]

Come to Cali let’s do the Rubicon trail!

[JeepTJ]

WELLLL....unfortunately my ball joints on my Gladiator did get bad with my 37s. I upgraded to an aftermarket all steel ball joint. Also replaced my OEM steering components with aftermarket heavy duty steering.

[hkatrib]

Great video. What about regearing to 4.56 for bigger tires?

[PrestonGladd]

I see you’re in North Carolina, I’m going to be moving there this summer, do you have a shop that you recommend? I’ll be both in the Asheville area and the Fayetteville area so really doesn’t need to be in a specific part of the state because I’m going to be traveling all over. I have a ‘21 392 XR and am currently living in Hawaii, so haven’t done much off-roading with it. However that will change and I want to make these upgrades you are recommending in this video. I have the skill to do the mods myself, I just would rather hire a trustworthy shop to do it.

[Garren.B]

Great video. Thank you! How makes the ditch light bracket?

[JeepLifeClub]

Can you share the pillar light mounts and lights you added there and on the front bumper?

[NoNamesAvailable]

Tazer is great for any Rubicon - love the swaykill. Glad my Jeep didn't come with front bump extensions - lots of suspension travel with DSC shocks for 2-3" lift and 35s (just running a single hockey bump ext up front). I suppose one advantage of the extension is it gives you an excuse to go hydro to maximize up travel. My theory on ball joints: Hard hits equivalent to jumping a small curb with speed dents the plastic wear socket. Traditional "testing" of the ball joint doesn't reveal a problem, but Jeep has occasional shimmy or odd feeling in certain scenarios. Jeeper then gets frustrated trying to get dealer/mechanic to find/fix problem, sells the Jeep. Regardless of my theory, I love the Teraflex ball joints. Ran them hard for a few hundred desert miles, adjusted them, and they have been rock solid since.

[tomdeskins]

That length works perfectly. But no worries about a 37” tire on stock XR wheels on stock suspension rubbing against the larger shock housing ?

[tomdeskins]

Sorry, forgot to ask you, are you using the FOX out of the box stock tune in the 392 Jeep 2.50 Elite DSC or did you have someone like Accutune do a custom tune for the shock ?

[JP-yfut]

Great content!!

My 392 gets 37" on august 1st.

Question. Should I get the tazer mini or a performance ecu (Diablo sport or something like that) to calibrate for the bigger tires.

Thank you for clear and concise content on the 392.

[aermotors]

Why do you need CV shafts in the front if you have disabled the AWD? Can you not go with traditional u-joint style upgraded shafts for a lot less than the RCV? Good video thanks!