Gear Vendors overdrive

Splitting Mopar autos doesn't work all that well because the 2-3 ratio is not far enough apart
2.45-1.45-1.00. versus 2.45-1.91-1.45-1.13-1.00-.78od ; splits of .78-.76-.78-.88-.78
unless you gear the diff. to trap in second over.
Say your SBM traps at 106; and say you want the Rs to be 5600, with 27s. And say the slip is gonna be 6% That calls for 3.55s, and second-over. So you can see the problem there, right away, namely a soft 60ft.
Whereas trapping in third(Drive) would require 4.10s; now yer talking. But the GV is still good to split the 1-2 shift.
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For a streeter; splitting 1-2 would likely allow your streeter to run less stall.
You could run say 3.73s and hit 60@ 5600 in first-over.... and cruise at 65=2350(0-slip), like it would with 2.94s in the back. The starter gear is a very nice ratio, for an automatic, of 9.14
That 5600 trap at 60 would allow you to run say up to 224*@.050 cam and a 2400 stall, and pull up some great fuel mileage. And with that 224* cam in a hi-compression 360, it's gonna lay a lotta lotta rubber. Perfect for a streeter.

But I'll tell ya; shifting at 5600 the Rs will drop to ~4400 ........ just 1200 rpm. So that points to a new LSA.... in the 106 or maybe less zone. And that means;
More power with the same 224* cam.... or move up to a 230* cam without the penalty of a softer bottom end
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So, as others have said, the combo sorta has to be built around the GV.

In my combo,it works awesome with a Commando 4-speed and 3.55s.