rear gear choice

[wideopen231]

Ok have a 4.10 in car,no runs to speak of yet. Also have 4.30 and 4.56 on shelf. Have chance for good deal on 3.90. Thinking 4.10 or 3.90 since this is bracket car and not trying to set world on fire,but run same number every time,hopefully in the 4.60 to 4.70 range.  What are you running gear,hp and et.

My setup. car and driver 1645 lbs,120 above target.
 486 Hemi about 1100 hp
 1.69 PG w/6600 stall
  15x14x32 MT tires
 4.10 to 4.56 gear ,4.10 in car
 

[afaulk]

My SBC is making around 950 or so (calculated hp, not dyno)  I just have a few runs on my new homemade chassis, a half dozen launches and 3 almost full 1/8 mile runs.  Naked it weighs 1300 and I had to add #80 to the nose. I weigh 185 suited up...so 1565lbs.total. My converter is at 5500 on the brake. The last 3 runs, leaving off the foot brake, with a 4.30 gear were 4.90, 4.80 and 4.75, with 1.08-1.09 sixty ft. Car is 185".  I said 3 almost full runs because I haven't yet seen the finish line and I was lifting early until the last run LOL. Now I can turn up the timing and start adding boost.

[Paul New]

I’m running 1500 or so with my blown 387” SBC, 2 disc crower 10” pedal clutch, 3 speed B&J 2.09 low 1.45 second, and 3.70 rear gear. I run 4.19-4.30 176 - 170 mph in the 1/8th. These numbers depend on how much of that adrenaline is pumping and how hard I want to push my stufff!  I run my stuff fairly easy other than 30lbs of boost.  I shift at 7800 and launch 5500-6000RPMS.  I do have a set of 3.90’s and 4.10’s if I really want to get after it!