I Put 392 Fox Shocks On My Diesel

[yarmo]

I've been running Teraflex Falcon SP's for ~3 years / 30k miles, but I made the decision to change them out for some brand new factory 392 Fox shocks I found for cheap. I figured it would be fun to try a different brand and see how I like them, and the 392 shocks should be valved pretty well for my diesel since they have very similar weights.

A stock 392 comes from the factory weighing in at 6,100 5,100 lbs and my diesel rubicon came in at ~5,800 ~5,000 lbs (I keep seeing different answers on this weight) so I think it's a pretty even swap between the two. The install was straight forward, and everything fits perfectly.

The 392 shocks are the exact same length as the Falcons and maybe 1/8" smaller in diameter of the shock tube, but it's very close. For reference the Falcons are about 1/2" longer than the stock red shocks that came on my Rubicon. One of the only differences is that the Falcons are offset at the top to push the shock valve away from the frame to fit their wider diameter (mostly at the top of the shock where it mounts). The Teraflex shocks do not have a shield on the fronts, but they do have one on the rears.

My initial impressions so far are that I actually like them more than the Teraflex set! The Falcons were very stiff which was great for 'spirited driving,' but weren't ideal for comfort and could be a little harsh. The Fox shocks feel softer and are valved a little better for a diesel. It's not a massive difference or anything, but for on road driving I prefer Fox. I'm interested to see how they perform off-road. I would highly recommend scooping a set of these up; lots of 392 owners scrap them when installing a lift, so they're a bargain for what you're getting.

Sponsored

 

[AC77]

That is good to see and know, what lift or have you done a lift ?

 

[yarmo]

That is good to see and know, what lift or have you done a lift ?

I did a very small load level lift to offset the weight I've added. It's a set of half inch spacers all around. You could easily get away with a level kit up to 1.5" or so, but I wouldn't go any larger than that.

I've got skids underneath + other weight in the vehicle and I'm on 35's for reference here.

 

[AC77]

i have installed the teraflex leveling kit, months back , i love the ride 2" fr & 1.5 rr

got any tunes ?

 

[brewski]

Fox shocks are valved for linear progression. This makes them compliant for slow offroad and small bumps. I know Bilsteins are digressive which makes them very good for road manners and high speed and I believe Falcons are digressive as well (correct me if I'm wrong).

I love the Fox shocks on my jeep, but I am 100% willing to give up road handling for small increases in offroad comfort. I don't daily drive my jeep and if I did I may have a different opinion. My jeep drives squishy and supple; exactly what I want.

 

[thance]

I've been running these shocks on my sport diesel as well, along with King bumps in the front. They are stiffer than stock and have much better road manners. No complaints here.

 

[AC77]

I've been running these shocks on my sport diesel as well, along with King bumps in the front. They are stiffer than stock and have much better road manners. No complaints here.

I've been running Teraflex Falcon SP's for ~3 years / 30k miles, but I made the decision to change them out for some brand new factory 392 Fox shocks I found for cheap. I figured it would be fun to try a different brand and see how I like them, and the 392 shocks should be valved pretty well for my diesel since they have very similar weights.

A stock 392 comes from the factory weighing in at 6,100 lbs and my diesel rubicon came in at ~5,800 lbs so I figure with my steel bumpers, armor, winch, etc I'm easily at least 300 lbs heavier than from the factory. The install was straight forward, and everything fits perfectly.

The 392 shocks are the exact same length as the Falcons and maybe 1/8" smaller in diameter of the shock tube, but it's very close. For reference the Falcons are about 1/2" longer than the stock red shocks that came on my Rubicon. One of the only differences is that the Falcons are offset at the top to push the shock valve away from the frame to fit their wider diameter (mostly at the top of the shock where it mounts). The Teraflex shocks do not have a shield on the fronts, but they do have one on the rears.

My initial impressions so far are that I actually like them more than the Teraflex set! The Falcons were very stiff which was great for 'spirited driving,' but weren't ideal for comfort and could be a little harsh. The Fox shocks feel softer and are valved a little better for a diesel. It's not a massive difference or anything, but for on road driving I prefer Fox. I'm interested to see how they perform off-road. I would highly recommend scooping a set of these up; lots of 392 owners scrap them when installing a lift, so they're a bargain for what you're getting.

I’m debating to install the AEV spacer lift with the 392 shocks. What do you think ? Daily driver and some trails once in a while. No rock crawling

 

[Hpc3]

I've been running Teraflex Falcon SP's for ~3 years / 30k miles, but I made the decision to change them out for some brand new factory 392 Fox shocks I found for cheap. I figured it would be fun to try a different brand and see how I like them, and the 392 shocks should be valved pretty well for my diesel since they have very similar weights.

A stock 392 comes from the factory weighing in at 6,100 lbs and my diesel rubicon came in at ~5,800 lbs so I figure with my steel bumpers, armor, winch, etc I'm easily at least 300 lbs heavier than from the factory. The install was straight forward, and everything fits perfectly.

The 392 shocks are the exact same length as the Falcons and maybe 1/8" smaller in diameter of the shock tube, but it's very close. For reference the Falcons are about 1/2" longer than the stock red shocks that came on my Rubicon. One of the only differences is that the Falcons are offset at the top to push the shock valve away from the frame to fit their wider diameter (mostly at the top of the shock where it mounts). The Teraflex shocks do not have a shield on the fronts, but they do have one on the rears.

My initial impressions so far are that I actually like them more than the Teraflex set! The Falcons were very stiff which was great for 'spirited driving,' but weren't ideal for comfort and could be a little harsh. The Fox shocks feel softer and are valved a little better for a diesel. It's not a massive difference or anything, but for on road driving I prefer Fox. I'm interested to see how they perform off-road. I would highly recommend scooping a set of these up; lots of 392 owners scrap them when installing a lift, so they're a bargain for what you're getting.

I think you're stating Gross weight for the 392... the '21 standard (non XR version with Fox shocks) is 5103lbs with the standard hard top per Jeep's figures... just FYI.

 

[RicRecon]

I have Daystar 1.5” in front and 0.75” in rear to level after adding factory steel bumper, steel skid, and winch. Added the Falcon 3.3s afterwards. Yes, they are a little stiff on road but I believe the weight of the diesel handles it well. Off-road and towing my off-road trailer is where these shocks really shine. First time I drove out towing with these shocks really amazed me how well it handled both on the highway, where it felt like the two vehicles were completely integrated, and then going through creek crossing and rocks on trails.

those 392 shocks sound cool but I am very happy with my Falcons.

 

[DubaiMarauder]

Fox shocks are valved for linear progression. This makes them compliant for slow offroad and small bumps. I know Bilsteins are digressive which makes them very good for road manners and high speed and I believe Falcons are digressive as well (correct me if I'm wrong).

I love the Fox shocks on my jeep, but I am 100% willing to give up road handling for small increases in offroad comfort. I don't daily drive my jeep and if I did I may have a different opinion. My jeep drives squishy and supple; exactly what I want.

I too like squishy and supple... wait, youre talking about jeeps... nvm.

in all seriousness, i cant wait to get rid of the stock Rubi shocks on my diesel. theyre so stiff.

 

[yarmo]

I’m debating to install the AEV spacer lift with the 392 shocks. What do you think ? Daily driver and some trails once in a while. No rock crawling

I think you’ll be limited on down travel with that setup. I believe that’s a 2” lift? You probably will not get full flex extension, but you’ll be fine if you aren’t doing serious off-roading imho.

 

[Cypher]

I have been running those for about 10,000 miles and still love them. I have a full set of springs as well I plan to swap over to. These ride much better than stock for sure.

 

[BijanF]

A stock 392 none XR weighs 5,150 lbs. The XR variant is just over 5,200 lbs. A Diesel weighs 40 lbs more.

 

[yarmo]

A stock 392 none XR weighs 5,150 lbs. The XR variant is just over 5,200 lbs. A Diesel weighs 40 lbs more.

I think you're stating Gross weight for the 392... the '21 standard (non XR version with Fox shocks) is 5103lbs with the standard hard top per Jeep's figures... just FYI.

You're right; I can't read! Updated my post, thanks.

 

[KevinC11]

Factory Jeep shocks are tuned to work with the factory coil springs. When you just replaced or swap out one of them, you have no idea what results you will get. A JL Sport with these shocks may have a very harsh ride, whereas like you with a diesel, the ride is pretty good/better than your Falcons. It's hit or miss and you won't know until you try it. Glad they worked out for you.

Reference - I have 392XR springs and shocks on my JLUW w/ 2.0L and Mopar steel front bumper. My ride improved ten fold. No more body lean in corners. No more rebound on slow speedbumps.

KevinC

Sponsored