Overdrive will definitely be in my future. For now, I'll likely swap between the 4.10 and 3.23 centersections I have for race days and longer distance cruises.
OD will be your friend on the street!
Your current 904 tranny ratios are 2.70 (Low), 1.54 (2nd) and 1.00 (Drive).
When you're ready to go OD, I suggest you take a look at some of the threads here on FABO regarding using a 200-4R OD tranny in place of your 904. The 200-4R ratios are very similar, but slightly better than, your current 904: 2.74, 1.57, 1.00 and 0.67 OD
My current '69 Dart build is using a reverse-pattern, full-manual shift 200-4R built by Extreme Automatics. I'm planning on 4.30 gears in my 8.75. Should be fun on both the street and the freeway since the 4.30 gears will be like 2.88s on the freeway in OD.
Can't wait to get it finished and hitting the street!
