for me - chevy v8 - stock 2nd is fine as a first gear, but it winds out fast, as does stock 3rd, as does stock 4th, and 5th is fine, but taller would get rev's down for highway cruise-ing ( 3000 rpm at 65 +- ) on 195x60x15 tires.
my question is why are stock final ratio's not spaced out evenly?
stock
3.091
1.889
1.261
0.926
0.710
3.091 x .61 = 1.889
1.889 x .66 = 1.261
1.261 x .68 = .926
0.926 x .77 = .710
evenly would be ...
3.091
2.496
1.901
1.306
0.710
for my v8, i am thinking of course to delete cantilevered first - thus i can use a beat up slider ; )
stock 2nd 1.889
?? 3rd - i need the right gear for inbetween stock 1.889 and 0.710
4th - use stock 5th ZD 0.710
5th - use flipped H 0.59 as an overdrive gear.
how the hell do i calculate the correct final gear ratio for my 3rd gear?
looks like an R (1.080) 25:27 - or - a flipped V 27:25 - is about right ??
jim
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consider changing the ring and pinion gear...
Carquip is who you need to call.
Rich
There are a number of things. I need to calculate tom see, but a flipped v may work. Cheap too.
i have an H gear - so i only need to determine the best 3rd - to fall between F and ZD - so that i would have a 3 spd plus overdrive : )
or i could try to make a 4spd with the correct 3rd and 4th to fit between F and flipped H. but this is more money as i would likely have to buy 2 gear sets.
doc - i think a flipped V might be right - pls let me know what you think.
at some point - i will need two transes built this way.
thanks!
jim
Jim, I am crazy busy as usual so it will be a bit before I get to this.
To answer your question, the R/P is 7:31.
To figure out your speed v RPM:
Take ratio of gears --> multiply buy 31/7 -->multiply by the circumference of your tires (stock is 24" roughly, actual is at top of chart in your post) --> Multiply by RPM
A flipped V is an R. Easier to figure that way.
lets just say you are building a 4sp gear box [2=1,3=2,4=3,5=4]
with the torque of the v8 you really don't want to "close ratio" the 1 to 2 shift because you will over power the tire pretty easily [you aren't fighting aero drag at all and all power will be hitting the tire hard], so a wider ratio from 1 to 2 is better to live with. from there the stock third will match shift rpm pretty good with a 4th gear flipped h/a gear set. this will make freeway driving nice and give you a good top end.
just make sure your clutch is up to holding the power.
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