Should I stick with the 2.48 standard stock gear or spring for the 2.75? Any disadvantages/advantages? I just want to eliminate as much of the natural "bog" that the TH400 has as as possible?

 

You plan to run mostly on motor or on the can?

 

Motor on the street and 150shot at the track. I have heard the 2.75 can be great if you want drivability like the 4L60e, but it is also the weak peice of the TH400. I will be going with the GV OD unit also.

note: I am going with a 427 also soon, plan on spraying 200+

 

Sounds like a great project you're building. The 2.48 gear with the power you'll be making will work great, just make sure you get a really good converter. Out of curiousity, is this OD unit because this will be your daily driver?

Eric

 

thanks for the compliments . . . she is not my daily driver, only been on the road twice this month, but when I want to go out cruising or run downtown (chicago) or something, the OD will be nice.

If I am going to do it, might as well get all the upgrades and do it right

 

No problem. BTW you won't have any problems cruising without OD. It's a nice to have, but remember not too long ago 3 speed autos were the factory norm. It all comes down to what people are used to. I speak from the experience of when I had a 67 Camaro, TH400, 4.56 gears and daily driven. Not that I'd suggest it for everyone, but just using an example. No matter what you do, I'm sure it'll be nice as it sounds like you've got some big plans