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I suggest reading up on KogboxKing's posts in the Shift-It forum. Here's a brief summary:

1.) The stock Focus diff is glass
2.) The PG puts extra stress on stock gears that are already over-stressed.
3.) If you plan to exceed 200 ft-lbs, you should upgrade to either a Quaife or Torsen ATB differential.
 

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if you are planning on upgrading your tranny with an lsd.
My suggestion is to hit up KogBoxKing. He is one of the designers of the MTX so he knows just a lil bit about them.
I may not be cheap... but it will be the best upgrade you may ever do to your car.
 

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Yes, do not go with the pg, the stock form of the diff is glass. Add 2 wheels getting grip and boom
 

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Phantom "where's the grip" I had one, and it made my car push bad, and spin the tires in the corners. Bad choice
Also, after 1,000 miles I burnt my dif up
I just installed a Thorsen lsd
works very well, and It is a true lsd.
 

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I just installed a Thorsen lsd
works very well, and It is a true lsd.
actually it's not a lsd... it's a atbd
 

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quaife is good. Thorsen is Ford Racing.
 
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