Quote:
Originally posted by fordkid68
Jeff65 will the 4.10 still seem to much with bigger then normal tires on the back.
69fastback I like the sound of that. thanks.
thanks
fordkid
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Wheel wells on classic Mustangs aren't big enough to handle tires of the width and diameter that it truly affects gear ratio. Here's an example:
Assume you use 3:89 gears and up the tire diameter from 25.4" to 27.5" (I doubt you can get a tire bigger than this in the wheel well and also have proportional width).
Calculate:
25.4x3.14=79.4
27.5x3.14=86.4
86.4/79.4=1.08
Hence you get 8% less gear.
For 3:89
3.89x(1-.08)=3.89x0.92=3.58
The tire effect is such as to reduce the gear ratio by one step.
For 4:11
4.11x0.92=3.78
3:78's are okay with five speed having overdrive of 0.68 or so but you will still shift three times quickly before the car starts to gain speed.