Technical > Dan Dishon's Transmission Den
Rearend gear ratio advice wanted
Dunc the Funk:
We have run 7.5s in the quarter at around 180mph this season & we are wanting to go a bit quicker next season.
We have a powerglide, 3.7:1 gears & Hoosier 33x15x15 tyres. We are now crossing the finish at near 8000rpm, which is our current rev limit.
I'm thinking of going to 3.5:1 or even 3.4:1 rather than winding the motor higher.
What gears/rpm do you folks use and what diameter tyres?
e-drag:
What you are stating does not compute:
http://www.wallaceracing.com/calcrgr.php
This calculator is pretty reliable. I would probably run a 4.11 gear if I were you. Again, do the math. I would be looking at your converter!
masracingtd1167:
I would also look at the converter . A 3.70 gear with that tire should be fine for your combo !
Dunc the Funk:
First season we ran a 4.29:1 & it was WAY too low, very violent launches. If the track was not good we had to leave in top. 3.7:1 does work well, our 60' is now down in the 1.05 sec range. I think either the converter is slipping a lot or the rev counter is telling lies.
masracingtd1167:
A1.05 is a decnt 60 ft but it seems like your finish line rpm dosent jive with your mph ! Might be worth talking to your converter guy about this !
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