You can choose Close or Wide ratio T56.
T56 Magnum Gear Ratios
Close: 2.66, 1.78, 1.30, 1.00, 0.80, 0.63
Wide: 2.97, 2.10, 1.46, 1.00, 0.74, 0.50
Passon A-855
2.64, 1.92, 1.40, 1.00, 0.70
T56 is definitely the most expensive and requires tunnel mod. They say also say not to exceed 450 HP in 4th gear.
I like the idea of a straight swap with Passon and that it is a couple thousand $$ less than a T56 all in, but at $5300 the A-855 is still $2505 more than a $2795 GVOD.
Merry Christmas!