# rear end ratio **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [August 10, 2006, 10:15pm UTC](https://forums.speedlife.net/t/rear-end-ratio/15805 "2006-08-10T22:15:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![speedped79](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedped79/32/7491_2.png) [@speedped79](https://forums.speedlife.net/u/speedped79)\ **Post date:** [August 10, 2006, 10:15pm UTC](https://forums.speedlife.net/t/rear-end-ratio/15805/1 "2006-08-10T22:15:13Z")
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 ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [August 11, 2006, 4:29am UTC](https://forums.speedlife.net/t/rear-end-ratio/15805/2 "2006-08-11T04:29:25Z")
[http://www.f-body.org/gears/](http://www.f-body.org/gears/) :tup: ---
**Author:** ![MaximaSE98](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/maximase98/32/7600_2.png) [@MaximaSE98](https://forums.speedlife.net/u/MaximaSE98)\ **Post date:** [August 11, 2006, 4:47am UTC](https://forums.speedlife.net/t/rear-end-ratio/15805/3 "2006-08-11T04:47:30Z")
> [@speedped79](#): > > 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 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