TKO600...What Part Number?

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I'm looking to get a brand new TKO600 transmission. Looking around I see there are (2) part numbers for this transmission. Basically they're the same with the exception of the final (5th) drive gear.

If there are any TKO600 users out there, what part number are you running and what's the real big difference? I looking to drag my street driven car about 6-7 times a year.

 

[jrichker]

See http://www.ttcautomotive.com/English/products/TKO.asp The answer is there.

 

[Sicarius428]

The .8 5th is great for road racing but not really necessary for a street car. Given most people upgrade their rear gears with at least a 3.55 with the TKO600 a good overdrive is nice for the freeway. If you are going to the track, chances are you won't hit 5th gear anyways...
Kevin