Diff Gear Swap

[shogun32]

if your goal is to just move to a 3.55 just buy the entire pumpkin. Used about $800 off ebay. I forget what they go for new but it was quite reasonable. If you want a Torsen just look for an Manual 6-spd Ecoboost Performance pack, or a A10 GT/PP1.

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[MyStang]

If you get cold feet on the swap.
Check into local 4x4 off road shops. Most likely they have done more gear changes than most others. Or can point you in the right direction.