rear end ratio

ok heres the specs
1979 trans am
455 olds motor approx 450hp 550tq
2500 stall
currently 4.10s
car spins alot and tops out very quick
what is the current topspeed about with a th350 4.10s 275x15 tires and a redline of 5600
and what ratio is reccomended for this setup
would 355,s make it faster or slower in the 1/8th mile considering the motor has the torque to pull the lower gears

http://www.f-body.org/gears/

:tup:

not necessarily…especially if it tops out before the 1/8"…and if there is excessive wheel spin at the launch…i dont know alot about this but i think 3.73s would be a better choice…little more street able and coudl help with the wheel spin…Skunky had 4.10s in his Mustang…he hated them…he spun halfway down the track on street tires on a lightly modded 5.0