Re: turbocharging a 472 caddy
The taller tires make your "effective" ratio taller as well,
not deeper. 29/28 = 1.0357. So, 3.57% taller tires give
you an effective 3.59-1 ratio. [3.73 minus 3.57% = 3.596]
Even if I'm wrong about the 3.33-1s, and 3.54-1s are the
tallest gear that you can find, that'll give you another
5.36% reduction in rpm at any given speed. Your "effective"
ratio with 3.54-1s would be then 3.41-1.
Ignoring your 1" taller tires, a .73-1 overdrive would make
the normal 3.54-1s act like 2.58-1s, and it would make 3.73s
act like 2.72s [2.48-1 and 2.62 effective when you add the inch
for the tires]
Damn, that's a tall overdrive gear in that trans. I don't
think that I've seen a trans with that much overdrive ratio.
Assuming that third is 1-1, it might not be a bad combo. 3rd
gear for steep hills, and od for the flat. A stick flywheel
for the Caddy is like $300 bucks though, and that's assuming
the 833 trans will work with a GM bellhousing.
56" <legayerabydavis56@y...> wrote:
> the reason i have 3.85 gears is my 3.73s origanaly had 28 inchtires
> but they were stupid 16.5s i switched to 16s they are 29 inchestall
> i didnt think the caddy rear axle would work but i had to ask ihave
> another option if i can find a bellhousing from a pontiac or buicki
> then i can use my 833 manual trans it has three forward and .73
> overdrivethat makes my 3.86 gears 2.81 gears i would rather use the
> manual trans they are much easier for me to work on the only reason
> swapped motors is i didnt want to pay 7500.00 for a 390 that wont
> make the same hp or torque as the 472