Rear axle longevity (carnage pics)

[beast40]

That’s not the only/main reason for the 2.72 Tcase ratio. Do you have a 392? Or even driven one in low range?

What’s the main reason? I’ve driven a few 392s but not off road.

My old TJ had a v8 (3.8 atlas) so plenty of v8 off road experience.

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[1996cc]

What’s the main reason? I’ve driven a few 392s but not off road.

My old TJ had a v8 (3.8 atlas) so plenty of v8 off road experience.

They are so torquey, and the 8 speed tranny has such a low first gear, I wouldn’t want lower ratios when rock crawling. I’ve seen plenty of comments from Scott Blum (head of the 392 team at Jeep) on 392 FB groups supporting this way of thinking. If you talk to Steve at Advance Adapters, he also recommends their 3.0 Atlas for the 392s. (I have one sitting in my shop waiting for me to install it). Neither of them have even mentioned axle life as a reason.

 

[Zandcwhite]

IMHO, folks with a factory engineered rig want/expect reliability. A 392 and D44 are not a match in my opinion. The great thing about the old Toyota trucks was drivetrain compatibility. Yes I have owned several and beat the snot out of them for 150 k miles without issue .

Factory 37’s, 392 and D44…oh wait this wasn’t a factory reliability issue at all.

 

[1996cc]

Factory 37’s, 392 and D44…oh wait this wasn’t a factory reliability issue at all.

I said nothing of factory reliability. I’m Talking about axle longevity for those who actually wheel and modify their vehicles. This thread probably isn’t for you…

 

[jellis4148]

He drove a 392 in 2wd. Obviously used a tazer or something so he could do that. Jeep designed to be on 4wd all the time for a reason. Doing donuts in the sand with tires and wheels that weigh around 120 pounds each in 2wd. This is not the Jeeps fault. That was pure abuse.

 

[No IFS]

Jeep cheated by adding full-time four-wheel-drive to try to save the week-ish Dana 44 rear axle by distributing the power front and rear. It’s an old trick. The V8 Toyota 4runner used it. Also, the GM hummer H2. All FJ cruisers in manual transmission are full-time four-wheel-drive so people don’t dump the clutch and blow the rear axle. What Jeep needed to do was install a heavy duty rear axle like the Bronco Raptor.

 

[1996cc]

He drove a 392 in 2wd. Obviously used a tazer or something so he could do that. Jeep designed to be on 4wd all the time for a reason. Doing donuts in the sand with tires and wheels that weigh around 120 pounds each in 2wd. This is not the Jeeps fault. That was pure abuse.

When did I ever blame jeep? This thread isn’t for you either obviously. Or are you going to delete this post soon like you did your other recent reply earlier??

In further proof of no blame towards Jeep, it’s not at the dealer for repairs, not going to ask either.

 

[Zandcwhite]

I said nothing of factory reliability. I’m Talking about axle longevity for those who actually wheel and modify their vehicles. This thread probably isn’t for you…

If you read the quote I replied to, sourdough said "people with a factory engineered rig want/expect reliability", which is what I commented on. Obviously you didn't call your rig factory. I agree that they should have put a Dana 50 or semi float 60 in the rear at least from the factory, but I haven't seen many rear axle failures on actual stock JL's with any powertrain. We push it going to 37's or larger even on the less potent 3.6 or 2.0t.

 

[jellis4148]

You post says longevity of the D44 with your “amazing” motors. It’s not the D44’s fault at all. You drove it in 2wd, which it was not designed to do. I’m guessing, and I may be wrong but all those donuts you spoke of doing were with the lockers engaged. L

 

[1996cc]

You post says longevity of the D44 with your “amazing” motors. It’s not the D44’s fault at all. You drove it in 2wd, which it was not designed to do. I’m guessing, and I may be wrong but all those donuts you spoke of doing were with the lockers engaged. L

Actually no. I do Most donuts in 4wd, otherwise it just digs down so fast and you go no where.

The best comments on threads like these always come from people that don’t even own the vehicles in question… ? ?

 

[jellis4148]

Your first post said doing donuts in 2wd in wet sand. You’re absolutely right I don’t own a 392 wrangler, and I never will. I think they were a poorly designed, rushed to market vehicle. Anyway, sorry for your issues. Hope you get them fixed. Regardless of your fault or Jeeps fault or whatever it still sucks when shit breaks.

 

[At Risk Ute]

I sold a 3.6 JL and wheel hard two 2.0 JLs. Just bought a 392 and the torque is insane. I appreciate OP sharing his experience. Mine is a Pavement Princess until I decide to lift and upgrade to tons.

 

[Tr4ckD4ys]

Isn’t an upgrade to tons upwards of 7000$ per axle in parts alone?

 

[jellis4148]

You’ll spend about $25,000 on tons by the time you buy everything including new wheels, tires and a bunch of other stuff. Need a new spare tire mount for 8 lug wheels.

 

[Rangemaster]

In case anyone is wondering how the Dana 44s will hold up long term with our amazing motors, here is my experience-

After roughly 35,000 miles, the rear locker failed and also took out the pinion teeth. I’m on 37”s with beadlocks. I do run in 2wd most of the time, but don’t do any hard launches unless I’m in 4wd or 4auto. Only 2wd donuts have been on sand.

And the upgraded Dana Spicer chromoly shafts don’t like the power either ?

Damn, that is a lot of miles. I have a 2020 diesel and I am still under 6k miles. I have a ton of mods and I am heavy on the pedal.

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