Ditching my 4.11s, and 31 spline Truetrac center section for a 35 spline spool. Was gonna go with a 4.30 for nitrous, finally decided on a 4.71. Most of my racing will be 1/8 mile, and the 4.71s should put me on the limiter through the traps in 3rd, but I'll still be able to shift into 4th when I start spraying. Also should put me close to the limiter in the 1/4 mile N/A. I'll just have to swap gears when I start spraying in the 1/4.

My old center section is available for 600 bucks, check the western classifieds section

 

That should be fun!!

 

I'm doing the same thing...but for 1/4 mile Good luck!