One thing that I learned is that just like a cam or converter you need to choose the gear ratios as part of the entire driveline package considering rear gears, tire diameter ect. The trouble with the .50 6th gear is that you could end up in a RPM range that is too low for highway cruising. The .50 may be ok if you have 4.11 gears but depending on your cam may not be useable with 3.23's.
The Tremec t56 magnum has a 2.66 1st with a .80 6th or 2.97 first gear with .63 6th. YOu need to figure out what is the lowest RPM your car can pull, and keep in ming that if the engine is lugging you may get worse fuel mileage than spinning it at higher RPM.
Here is a link to some info on the Camaro 6 speeds that has more info.
http://www.camaros.net/forums/showthread.php?t=98387Here is some info I gathered on the gear ratios for the various 4, 5 ,and 6 speed options
Trans 1st 2nd 3rd 4th 5th 6th
T56 Magnum TUET11009 2.66 1.70 1.30 1.00 0.80 0.64
T56 MagnumTUET11012 2.97 2.10 1.46 1.00 0.74 0.50
Keisler T45R (350/450HP) 3.37 1.99 1.33 1.00 0.67
TKO500 3.27 1.98 1.34 1.00 0.68
TKO600 2.87 1.89 1.28 1.00 0.64
TKO600 2.87 1.89 1.28 1.00 0.82
A833OD (75-87) 3.09 1.67 1.10 0.73
A833 (A body 64-65) 3.09 1.92 1.40 1.00
A833 71-72 18 spline) 2.44 1.77 1.34 1.00
A833 (TA 71-74)) 2.47 1.77 1.34 1.00
A833 (B/RB 64-70) 2.66 1.91 1.39 1.00
Passion Performance 2.64 1.92 1.40 1.00 0.70
