New HD Dana 44 full float axles

[Beachcomber72]

Or the semi float 9.25" rear axle in my ram...with a 10,500lb tow rating.

Nice.

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[Zandcwhite]

Nice.

I join the Jeep towing discussions even though I'll likely never tow with it, that's what the truck is for.

 

[Beachcomber72]

I join the Jeep towing discussions even though I'll likely never tow with it, that's what the truck is for.

I’m towing right at 3700 fully loaded down and fresh water tank at half full with the 2022 High Tide.

 

[Renegade]

This is the axle that Dana has converted to full float:

Ultimate Dana 44™: Built Tough for Off-Road.
From the Spicer® nickel chromoly steel axle shafts.

• Thicker tubes
  • 5/16" thick for improved strength, rigidity, and durability
• Redesigned and thicker brackets
  • 1/4" steel to resist bending and endure the off-road environment
  • Works with most lift kits
• Spicer® chromoly axle shafts for optimal strength and performance
• Genuine Spicer® gearing
  • Precision design and manufacturing processes provide ultimate gear mating for optimal strength, life, and quiet performance
  • Expanded aftermarket gear ratios: 3.73, 4.10, 4.56, 4.88, 5.13, and 5.38
• Pinion angle optimized for lifting vehicles
• Increased gross axle weight rating (GAWR) allows for the added weight of suspension upgrades, bumpers, winches and larger tires (up through 37" tires)
• Improved caster angle for lifted Jeeps®
  • Reduces "bump steer"
• Dana recommends using military tested and approved 75W-140 synthetic lube (not included)

If this is the case, it’s an even more significant upgrade for Rubicons. Where does the info on this axle being the starting point come from?

 

[Old Jeeper]

If this is the case, it’s an even more significant upgrade for Rubicons. Where does the info on this axle being the starting point come from?

Spicer-Dana

 

[Renegade]

Spicer-Dana

I mean where did Jeep say that the Dana-Spicer UD44 would be what’s put in the 2024 Rubicon? That data on the UD44 has been available since 2018. I figured it would be the Advantek M220 with new tubes and full float hubs bolted on. I know it’s close…

 

[Old Jeeper]

I mean where did Jeep say that the Dana-Spicer UD44 would be what’s put in the 2024 Rubicon? That data on the UD44 has been available since 2018. I figured it would be the Advantek M220 with new tubes and full float hubs bolted on. I know it’s close…

The way I understand this, the M220 is a D 44 REAR axle with 4:10 gears beginning in 2018.

 

[azwjowner]

The way I understand this, the M220 is a D 44 REAR axle with 4:10 gears beginning in 2018.

The specs you quoted are from the upgraded aftermarket Dana Ultimate 44, which is thicker and stronger than the M220 Dana 44 that Jeep has been using. I'd be very surprised if they put an Ultimate 44 in every Rubicon; I expect it to be the M220 that's simply full floating instead.

 

[Renegade]

The way I understand this, the M220 is a D 44 REAR axle with 4:10 gears beginning in 2018.

Correct. The JT Rubicon versions have thicker tubes and suspension brackets than the JL version, but is still not quite UD44 thickness. There are also pinion angle/oiling differences between the Rubicon axles and the UD44, as well as chromoly axle shafts in the UD44. I guess we will see what shows up.

 

[Headbarcode]

Yeah, so has to be better for the gears too I recon.

Yeah, more holding strength for both the carrier assembly and axle shafts.

 

[RubiSc0tt]

The new grill probably allows for more cooling. Also they probably are using the 392/4xe/XR rear brakes to get that rating... but likely a little bit of everything (including the previous measurement being conservative).

That's what I was thinking with the grille change.

With the full float rear 44, I'm wondering if it's to help the rear axle live a little longer behind the 392. There's a handful of threads in the 392 forum where people talk about putting larger tires (35-37") on the 392 and still twisting the splines on the axle shafts. Given they're putting 37's on their 20th anniversary packages and the AEV editions, this might be to help mitigate any sort of rear axle issues with that. Could also be for the 4xe's additional torque.

Either way, we all benefit. I wonder what a conversion/ bolt in kit for a late model will run? I'm guessing it would have to be less than a Mopar D60, otherwise it makes no sense.

 

[Bzinsky]

That's what I was thinking with the grille change.

With the full float rear 44, I'm wondering if it's to help the rear axle live a little longer behind the 392. There's a handful of threads in the 392 forum where people talk about putting larger tires (35-37") on the 392 and still twisting the splines on the axle shafts. Given they're putting 37's on their 20th anniversary packages and the AEV editions, this might be to help mitigate any sort of rear axle issues with that. Could also be for the 4xe's additional torque.

Either way, we all benefit. I wonder what a conversion/ bolt in kit for a late model will run? I'm guessing it would have to be less than a Mopar D60, otherwise it makes no sense.

My first thought when i heard about this was….maybe the 392 will finally have 2wd and the 4xe will have full power in 2wd

 

[Zandcwhite]

That's what I was thinking with the grille change.

With the full float rear 44, I'm wondering if it's to help the rear axle live a little longer behind the 392. There's a handful of threads in the 392 forum where people talk about putting larger tires (35-37") on the 392 and still twisting the splines on the axle shafts. Given they're putting 37's on their 20th anniversary packages and the AEV editions, this might be to help mitigate any sort of rear axle issues with that. Could also be for the 4xe's additional torque.

Either way, we all benefit. I wonder what a conversion/ bolt in kit for a late model will run? I'm guessing it would have to be less than a Mopar D60, otherwise it makes no sense.

As far as we know, the shafts won’t be any larger. You’d be better off upgrading to chromoly shafts than swapping in a FF44 with stock shafts. It’s a minimal upgrade in load bearing and does nothing to improve axle shaft strength in my opinion.

 

[GoHack]

Do the Gladiator Rubicon's get this full-float Dana 44HD solid rear axle as well?

 

[Lofty]

Do the Gladiator Rubicon's get this full-float Dana 44HD solid rear axle as well?

No

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