I was giving the observations about powerglides, 3.08 gears, 3.55 gears, and the TH350. So i looked at it from a different angle, comparing the combined first gear ratio based on Preacher-No Choir's observations:
Powerglide 1.82 & 3.08 rear: 5.61:1 combined ratio
Powerglide 1.82 & 3.55 rear: 6.46:1 combined ratio
TH350 2.52 & 3.08 rear: 7.76:1 combined ratio
Preacher said replacing a 3.08 with a 3.55 was almost like going to a TH350. The TH350 with 3.08 is definitely a deeper first gear than even the Powerglide with the 3.55. The math seems to indicate that the TH350 is better than the Pglide/3.55 even with the "kiss of death" 3.08. Not sure how that helps with picking a deeper gear tho?
I'm not sure what axle the Nova has, the L6 post 1970 Camaros all came with a GM Corporate 10 bolt rear and only 2.56, 2.73, 3.08, 3.42, and 3.73 from the factory. No 3.55 like the early SD 10 bolts had.
