Not Ranked
My BDR has the same TKO-600. My rear came from BDR as a 3:46 open diff. I switched it out to a 3:73 with 40% lock up. It is way better.
Because the 1st gear is tall at 2.87, you can run alot more gear in the rear without winding 1st gear out at a low mph.
I find the real problem is the .64 OD. The jump from 4th to 5th is just way to great. I really wish I had the .82 OD.
I never noticed a difference in gas milage between the 3:46 and 3:73.
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