Rock-trac question

krel1

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On a 2019 JLUR, is it correct that when the transfer case is put into 4hi the center differential in the transfer case is locked sending 50% power to each axle? Or is the transfer case an open differential on the rubicons?
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supermike

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Any thing 4H means locked 50% front 50% back, no matter what transfer case what brand vehicle.

If there is a center differential that's called AWD.

An AWD with center differential locked(if equipped with center differential lock), is 4H.
 

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Not all vehicle's centre diffs lock 50% split between front and rear in 4H. Some lock 60% rear and 40% front by means of viscus coupling, clutch system, etc.
 

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Not all vehicle's centre diffs lock 50% split between front and rear in 4H. Some lock 60% rear and 40% front by means of viscus coupling, clutch system, etc.

Then it's in 4wd or 4H auto or whatever you call it.
If it's in 4H, it's 50/50...
 

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The standard transfer case in (almost) all wranglers has a part time 4HI configuration. That locks the front to rear inside the transfer case. The low range in the Rubicon is different than the others but they all have the same shift modes.

There is an optional transfer case that gives you a full time 4HI option. I don't know if that comes standard on any trim level for sure. Even the Rubicon has the optional full time transfer case. From what I read (and anyone correct me if I'm wrong), you get an extra shift position. You still have 2hi/4hi part time/Neutral/4lo like the standard case but it adds one so you get 2hi/4hi part time/4hi full time/neutral/4lo.

I don't know how often people buy the full time transfer case. But for the most part, you will find the part time (front locked to rear) as standard.
 

viper88

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I have a '19 Rubicon now. I am thinking of buying a new Rubicon. I see a new option.

What's this 4:1 Rock-Trac Heavy-Duty Full-Time 4 wheel-drive system? Any advice or opinions on this option?
 

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Reinen

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I have a '19 Rubicon now. I am thinking of buying a new Rubicon. I see a new option.

What's this 4:1 Rock-Trac Heavy-Duty Full-Time 4 wheel-drive system? Any advice or opinions on this option?
I have it. Beyond the technicals, in real world application it's fantastic for partially cleared snowy roads where you transition from clear to snow/ice often. It's also nice on easy dirt/gravel roads where 2WD will suffice 90% of the time. I wouldn't call it a necessity, you can always shift between 2WD and 4WD yourself, but it's nice to not need to do that and have 4WD when you need it and 2WD when you don't.

Rock crawlers wouldn't like it because it replaces your U Joints with CV Joints, but most people won't have an issue with that.
 

viper88

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I have it. Beyond the technicals, in real world application it's fantastic for partially cleared snowy roads where you transition from clear to snow/ice often. It's also nice on easy dirt/gravel roads where 2WD will suffice 90% of the time. I wouldn't call it a necessity, you can always shift between 2WD and 4WD yourself, but it's nice to not need to do that and have 4WD when you need it and 2WD when you don't.

Rock crawlers wouldn't like it because it replaces your U Joints with CV Joints, but most people won't have an issue with that.
How is the turning radius compared to a Rubicon with U joints?

Any other pros and cons?
 

Reinen

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How is the turning radius compared to a Rubicon with U joints?

Any other pros and cons?
Can't say I've ever compared the two but in general a CV joint is capable of a tighter turning radius. In a JL the turning radius is probably identical to U Joints. The biggest con of CV joints is the possibility of a stick poking up and tearing your CV boot. It's rather well protected from rocks but a stick can get up in there.

This is a good comparison of the two.
https://www.cjponyparts.com/resourc...hile a CV joint and,that CV joints break less.
 
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