Originally Posted by shmiv
Can I still use the carrier that I'm running with the 2.56 gears? The rearend is a 8.2" 10 bolt 1970 Chevelle. What RPM would I be running with the 3.50 gears and a 350th tranny @ 60mph with stock tire height? Also, can you keep the original drive shaft unaltered if the 350th was swapped for a 200r4? I have a 700r4 I was thinking of using but is longer. Which one is the easier swap - 700r4 or 200r4? Which one is better?
The 2004R has a better 1st to 2nd gear spread than the 700R4. It's lighter & takes (slightly) less HP to turn.
Here's a calculator that shows rpms/speeds with different ratios.> http://hotrodworks.net/hotrodmath/quarter.html
Just input your Info. 2nd calculator, also chart below it shows ratio/speed changes.