Front Track Bar

[WILDHOBO]

The stock bolts are 14mm, not 15mm, and Grade 8 is considered the SAE equivalent to 12.9.

The stock, fully threaded track bar bolts are fine 1) IF they stay tight, and 2) IF the vehicle remains within the stock suspension travel limits. Add a lift with more travel and the tolerance difference between 14mm and 9/16" becomes a factor, the bolts begin to shift and the threads begin to oval out the bracket holes. This is a well known issue with JK, JL & JT, goes back to the earliest days of the basic platform, with an equally well documented and simple fix. Might want to do a little reading.

Maybe you should read the difference between 12.9 and grade 8. And I at no point questioned the full thread argument. I agree whole heartedly that smooth shanks are stronger. But most of those threads are in the track bar sleeve. If the clamping force is sufficient, they won’t be able to move, and therefore can’t oval out the brackets. Maybe you should read about clamping force. Just check for any loosening often and these issues won’t likely happen.

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[SoK66]

Maybe you should read the difference between 12.9 and grade 8. And I at no point questioned the full thread argument. I agree whole heartedly that smooth shanks are stronger. But most of those threads are in the track bar sleeve. If the clamping force is sufficient, they won’t be able to move, and therefore can’t oval out the brackets. Maybe you should read about clamping force. Just check for any loosening often and these issues won’t likely happen.

They loosen all the time, that's why the suspension builders get rid of the stock bolts, particularly on the track bars. To wit:

https://www.grimmoffroad.com/produc...txGIahNtN5Avm4Mwmql19v5sgX7rIFtIaAuyeEALw_wcB

 

[WILDHOBO]

https://www.grimmoffroad.com/produc...txGIahNtN5Avm4Mwmql19v5sgX7rIFtIaAuyeEALw_wcB

So because something is sold, proves that it’s the way to go? Grade 8 is simply not as strong as 12.9. Math.

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