Teraflex 2 Low

[Ol Blue]

So the holiday OT did me well. I was able to purchase ucf ultra clearance skid, metalcloak rear track bar w/bracket and JB super short sye. The question is should I wait another week or two to purchase the 2 low kit ? I figured I’m going to have to split the 231 anyhow ,but the only time I wish I had the 2 low was on the rubicon on the granted bowl. Help me spend or save my money! haha

 

[Lou]

I did a 2low under the same circumstances. I figured, I was already in the tcase why not! I have selectable lockers which in my opinion makes the 2low pretty useless. It also does not shift nearly as buttery as stock. If you have a front auto locker I think 2 low would be worthwhile.

 

[Ol Blue]

I do have a spartan auto locker up front.

 

[B00mb00m]

I use 2low for forest road travel to keep my auto trans cool on long ascents.

 

[Ol Blue]

How often do you use the 2low with selectable locker ? It’ll probably be wise just to save the money for a new locker upfront ?

 

[B00mb00m]

I don't use it for the traction, I use it for the gearing so it's separate function than selectable locker.

 

[Rescue6]

I had to modify the tera 2 low to shift smoother but it worked well. I now have an atlas. I love the 2 low option and run in more than 4low honestly on a lot of trails. I only need 4wd on an obstacle and I run 2 low for the rest. It frees up the steering etc. and I have selectable lockers and still choose to run it.

 

[Wildman]

I had the 2Lo in my t-case and had a LockRight in the front axle and a Detroit in my rear axle along with a Tera 4:1 kit. I found I used the 2Lo a lot when I had mine. It also made it easier when using the Jeep to move a trailer or at a boat ramp. Had a buddy who had a STEEP driveway and I would move his trailer for him.

I used it off-road about 30% of the time as it does place a lot of strain on the rear axle ( of that is what I was told at the time)

 

[Jim Byrne]

I installed a Rubicrawler a couple of years ago. I love the ability to use in 2WD as well as the extreme low going down steep hills and crawling slow over rocks that I had to use a bit of speed on before.

 

[RangerRick]

Had a Tera-2-Low in my Rubicon NV-241OR Rock Track transfer case for many years. Used it 90% of the time on technical trails like the Dusy-Ershim, Swamp Lake, Moab and The Rubicon trail. Makes you almost never need 4WD except extreme obstacles and for those with a fixed full locker like a Detroit up front, it's almost a necessity for tight technical trails. It's not for everyone but it does work well in certain situations. Just remember, your planetary gears are still spinning very fast and use caution to not over-rev them or you will damage your NP/NVG TC in fairly short order speeding around when you should be in high range instead.

Went to an Atlas II now so I can run around in front or rear, high or low range with true twin-stick capability. After a couple of expensive transfer case planetary failures it was evident for the need to go to a gear-driven HD TC.

RR

 

[B00mb00m]

I had to modify the tera 2 low to shift smoother but it worked well. I now have an atlas. I love the 2 low option and run in more than 4low honestly on a lot of trails. I only need 4wd on an obstacle and I run 2 low for the rest. It frees up the steering etc. and I have selectable lockers and still choose to run it.

What modifications did you make? The only thing i could think of is reducing detent spring force.

 

[B00mb00m]

Had a Tera-2-Low in my Rubicon NV-241OR Rock Track transfer case for many years. Used it 90% of the time on technical trails like the Dusy-Ershim, Swamp Lake, Moab and The Rubicon trail. Makes you almost never need 4WD except extreme obstacles and for those with a fixed full locker like a Detroit up front, it's almost a necessity for tight technical trails. It's not for everyone but it does work well in certain situations. Just remember, your planetary gears are still spinning very fast and use caution to not over-rev them or you will damage your NP/NVG TC in fairly short order speeding around when you should be in high range instead.

Went to an Atlas II now so I can run around in front or rear, high or low range with true twin-stick capability. After a couple of expensive transfer case planetary failures it was evident for the need to go to a gear-driven HD TC.

RR

It must be a 4:1 is weaker? I haven't heard many problems about the NP231J. I am running up to about 25mph or so on logging roads.

 

[RangerRick]

It must be a 4:1 is weaker? I haven't heard many problems about the NP231J. I am running up to about 25mph or so on logging roads.

All 4:1 planetary type transfer case parts spin at a high RPM due to the 4:1 ratio of the TC design. Pinions start to fail and this failure shows up as shiny metal flecks in the oil at service time. The worst failure prone 4:1's are the Tera-Low units. I probably wouldn't drive over 15 MPH in low range for any length of time to prevent failure. Always shift to 1:1 if you need to go faster than that and never use a Tera-Low 4:1 in 5th or 6th gear overdrive ever! You will be asking for certain failure and it's not a case of IF but WHEN .



RR

 

[jjvw]

I still have trouble understanding the use of 2 low other than a novelty. I haven't recognized a situation where steering in 4wd unlocked was a hindrance that mattered. And since I separated my locker switches, I unlock the rear when I need to turn since that is where the majority of the steering loss comes from.

 

[Lou]

I still have trouble understanding the use of 2 low other than a novelty. I haven't recognized a situation where steering in 4wd unlocked was a hindrance that mattered. And since I separated my locker switches, I unlock the rear when I need to turn since that is where the majority of the steering loss comes from.

This. It sounded cool but I can hardly tell a difference on tight maneuvers off road(if I’m unlocked).

 

[freedom_in_4low]

if it was $100, I could see doing it while I had the case apart. But not for nearly $300.

The teralow 4:1 kits didn't happen to come with the 2 Low parts, did they? I was given a 4:1 case with a blown planetary. If it's 2-low, I could use the fork and the selector in my case while I have it apart for the SYE.

 

[Lou]

Move the selector and feel the detents.

 

[Wildman]

if it was $100, I could see doing it while I had the case apart. But not for nearly $300.

The teralow 4:1 kits didn't happen to come with the 2 Low parts, did they? I was given a 4:1 case with a blown planetary. If it's 2-low, I could use the fork and the selector in my case while I have it apart for the SYE.

No they didn't.

 

[B00mb00m]

All 4:1 planetary type transfer case parts spin at a high RPM due to the 4:1 ratio of the TC design. Pinions start to fail and this failure shows up as shiny metal flecks in the oil at service time. The worst failure prone 4:1's are the Tera-Low units. I probably wouldn't drive over 15 MPH in low range for any length of time to prevent failure. Always shift to 1:1 if you need to go faster than that and never use a Tera-Low 4:1 in 5th or 6th gear overdrive ever! You will be asking for certain failure and it's not a case of IF but WHEN .



RR

I don't have a tera-low just 2-low with standard np231 gears

 

[psrivats]

... And since I separated my locker switches, I unlock the rear when I need to turn since that is where the majority of the steering loss comes from.

You've probably explained this before, so sorry if I'm asking for repeat information. I still have trouble wrapping my head fully around what you said here. How is keeping the rear unlocked and front locked better than the vice versa for steering?