M200 axle strength??

[entropy]

Yep, I'm getting that RocTrac T-case for my sport, I don't need the better gears for the road, but off road that 4:1 is much more important to me

Did you already order one?

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[entropy]

I love my 2 door sport S. I dont regret my purchase at all. Did for a while, then got into wheeling and had such a blast with my torq locker and rear LSD. I paid 31.5k for it before taxes back in 2019 and it is not the base model.

I am throwing 35s on it when I get the chance. Already have it all setup with a small lift, rubi fenders, adjustable bumpstops.

Just go out an enjoy your Jeep be it sport, rubi, 4 door, 2 door. It rarely matters. Some would be a bit more capable but they can all get through at the end of the day. A budget build sport like mine is still cheaper than a rubi and can get through the trails just fine.

Also that painted top is fugly and so is the rubi hood.

 

[blnewt]

Did you already order one?

Not yet, I will go to one of their yards, probably, albuquerque, las vegas or casa grand.
https://www.car-part.com/
enter info and select transfer case (I selected DHW for V-6 AT) and you'll see a large list from LKQ, they're dismantlers and typically charge a small core fee.

 

[Joaquim]

Welp, the vehicle is almost 5 years old and has run the same BFG Ko2 at 34.4 on method 305s throughout various levels of wheeling. It doesn’t feel like the m186/m200 is much weaker than the m210/m220. Keeping the vehicle relatively light and avoiding bashing the axles on rocks has probably helped. I’m intending to upgrade directly to the Dynatrac 60/60 eventually and will definitely not bother with the m210/m220 because the weak points seem the same. Jeep’s BLD has surprised me in how effective it is with the open diffs.

 

[donmontalvo]

Keeping the vehicle relatively light and avoiding bashing the axles on rocks has probably helped.

Nail hit squarely on head.

 

[Joaquim]

Nail hit squarely on head.

As far as I understand these are the specs of the m186/m200

Dana 30 front axle:

Ring gear size: 7.2 inches
Axle shaft diameter: 1.16 inches
Axle shaft spline count: 27
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 2600 lb-ft

Dana 35 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.18 inches
Axle shaft spline count: 30
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 3200 lb-ft

and then for the m210/220:

Dana 44 front axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 30
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Dana 44 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 32
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Seems like the JL D30/D35 is more than sufficient, and if you really need more it may be worth it to upgrade to the Dynatrac D60 which is rated for somewhere around 4,500 lb-ft and the D80 at 7,500 lb-ft.

I'm sure many people will disagree with the max torque capacity of these axles, but if you do, please provide some evidence.

 

[Zandcwhite]

As far as I understand these are the specs of the m186/m200

Dana 30 front axle:

Ring gear size: 7.2 inches
Axle shaft diameter: 1.16 inches
Axle shaft spline count: 27
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 2600 lb-ft

Dana 35 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.18 inches
Axle shaft spline count: 30
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 3200 lb-ft

and then for the m210/220:

Dana 44 front axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 30
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Dana 44 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 32
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Seems like the JL D30/D35 is more than sufficient, and if you really need more it may be worth it to upgrade to the Dynatrac D60 which is rated for somewhere around 4,500 lb-ft and the D80 at 7,500 lb-ft.

I'm sure many people will disagree with the max torque capacity of these axles, but if you do, please provide some evidence.

The extra 1k lb-ft between the front axles is pretty significant. The cost difference between bolt in Rubicon take-offs that also upgrade the gearing and give you lockers that I've seen sell as low as $2k and bolt in dana 60s at $15k+ and the need for new driveshafts and wheels at a minimum are kind of an extreme difference. Would I drop $5k+ to upgrade to dana 44s like some have? Absolutely not. I might drop that $5k for a set of XR take offs as a regear alone in my area runs $3k and adding lockers would be the other $2k so you're getting a stronger set of axles for the cost of fixing the shortcomings of a sport for serious wheeling. Nobody is claiming the 44s are dana 60 strong, but they are soooo much cheaper. If you're building for 40" plus tall tires and plan on rock bouncing skip the 44s, you need 60s, cash out the kids college fund. If you want to wheel hard on 35s or moderately hard on 37s, save your money and go for some Rubicon take offs.

 

[Rodeoflyer]

As far as I understand these are the specs of the m186/m200

Dana 30 front axle:

Ring gear size: 7.2 inches
Axle shaft diameter: 1.16 inches
Axle shaft spline count: 27
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 2600 lb-ft

Dana 35 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.18 inches
Axle shaft spline count: 30
Gear ratios available: 3.45, 3.73, 4.10, and 4.56
Max torque capacity: approximately 3200 lb-ft

and then for the m210/220:

Dana 44 front axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 30
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Dana 44 rear axle:

Ring gear size: 8.5 inches
Axle shaft diameter: 1.31 inches
Axle shaft spline count: 32
Gear ratios available: 4.10 and 4.88
Max torque capacity: approximately 3600 lb-ft

Seems like the JL D30/D35 is more than sufficient, and if you really need more it may be worth it to upgrade to the Dynatrac D60 which is rated for somewhere around 4,500 lb-ft and the D80 at 7,500 lb-ft.

I'm sure many people will disagree with the max torque capacity of these axles, but if you do, please provide some evidence.

The M186/200/210/220 are in mm so 186mm=7.3'' ring gear, 200=7.8 and the 220 rear in the rubicon is 8.6''.. The JL axles also have a little thicker tubes. They also claim the gears themselves are stronger. i've seen a BUNCH of guys wreck the 210/220 (rubicon axles) trying to run 40's here in CO. I would never run more than a 37 on the stock axles and plan to weld up my tubes and truss both front and rear even on 37s.

this is pretty detailed vid of the changes

 

[grimmjeeper]

The M186/200/210/220 are in mm so 186mm=7.3'' ring gear, 200=7.8 and the 220 rear in the rubicon is 8.6''.. The JL axles also have a little thicker tubes. They also claim the gears themselves are stronger. i've seen a BUNCH of guys wreck the 210/220 (rubicon axles) trying to run 40's here in CO. I would never run more than a 37 on the stock axles and plan to weld up my tubes and truss both front and rear even on 37s.

this is pretty detailed vid of the changes

My front M210 is already trussed with steel knuckles and RCV shafts. The rear M220 truss is here but not welded on yet. I still need to order rear shafts.

I'm not planning on going bigger than 37s.

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