I had converted to the southern hemisphere system. Turn your calculator upside down! Dam these phones with flipping screens.
Makes perfect sense to me.
Every day is a school day, am loving this.
What I would like to know is..... who when working out a gear ratio decides on a figure that best serves the car in question depending on power, weight, carrying capacity, etc, then realises that by tweeking the gear sets can arrive at a ratio that will bring the same sets of teeth on the two gears together the least amount of times as possible ?
I bet people like these don't get out much, but it is beyond clever.
Why would you need to limit the amount of times the same teeth come together when everything is machined and set up up so precisely, and is running in a bath of hypoid oil ?
Is it something to do with cancelling harmonics that may lead to whine ?
The 64000 dollar question is - how do you work out when the same set
will come together on a 3.08.3333333 : 1 gear set ?
The OP asked what ratios are in the diffs, and why fit an LT77.
It all depends on what you want from your car, my experience was, fitting an LT77 made the V8 car a great tourer, BUT, I had circa 290 lb ft of torque, so performance was brisk, a car with stock power may lack some sparkle ? Maybe having the need to drop between 5th and 4th to maintain progress when loaded up.
I would have been keen to see what my old car would have been like fitted with the 3.54 :1 ratio and LT77. It would have made track days more fun for sure.
I just looked out the window, in the time it took me to type this ramble the snow has arrived, on very wet ground everything is now white, looks serious !