72HCODE
"My World is Fire and Blood"
calculating the speedo gear is a problem there is actually software that calculates it but it costs a lot of money i had a license for the software but that was a couple of computers ago and i no longer have access to it.
i don't know how accurate this is
http://www.tciauto.com/tc/speedometer-gear-calculator/
or
http://www.classic-cougar.com/tools/speedocalc/speedocalc.php
when you do the calculations by hand you end up with numbers like 11.5 or 13.9 so you have to round up or down and there is a percentage of error involved.
changing a speedo gear in the trans at least for a C6 is very easy. there is one bolt you pull out the cable with gear, pop the clip and then install a new gear and pop it back in. there is no fluid loss at least with a C6.
when you change the gear find a road with a speed sensor that shows your current speed, and drive it with the new rear end and see how off you are, then buy a couple of gears and try them out.
with my car i did the software method then i tested the car on a road with a speed camera and confirmed i was basically right on the mark.
there are not too many gears to choose from so it wouldn't be that hard to just keep swapping them.
i used to have a 2.75:1 ratio and at 65 it was about 2500, i needed to replace the gears due to damage and i had to go with a 3.00:1 ratio because they do not make 2.75:1 ratios any more. so at about 70 i'm running about 2900rpms. i do a lot of highway driving and honestly i hate the lower ratio i would of loved to have stuck with the 2.75 but at the time i didn't have a choice. what sucks is running at 75-80mph to keep up with traffic. i'm up towards 3500rpms and it just gets really loud inside the car. so it kind of forces me to go 60-65 and i have to stay in the right lane.
i can't even imagine guys that have 4.25 in the back doing 5000rpms at highway speed its like screaming going slow.
i don't know how accurate this is
http://www.tciauto.com/tc/speedometer-gear-calculator/
or
http://www.classic-cougar.com/tools/speedocalc/speedocalc.php
when you do the calculations by hand you end up with numbers like 11.5 or 13.9 so you have to round up or down and there is a percentage of error involved.
changing a speedo gear in the trans at least for a C6 is very easy. there is one bolt you pull out the cable with gear, pop the clip and then install a new gear and pop it back in. there is no fluid loss at least with a C6.
when you change the gear find a road with a speed sensor that shows your current speed, and drive it with the new rear end and see how off you are, then buy a couple of gears and try them out.
with my car i did the software method then i tested the car on a road with a speed camera and confirmed i was basically right on the mark.
there are not too many gears to choose from so it wouldn't be that hard to just keep swapping them.
i used to have a 2.75:1 ratio and at 65 it was about 2500, i needed to replace the gears due to damage and i had to go with a 3.00:1 ratio because they do not make 2.75:1 ratios any more. so at about 70 i'm running about 2900rpms. i do a lot of highway driving and honestly i hate the lower ratio i would of loved to have stuck with the 2.75 but at the time i didn't have a choice. what sucks is running at 75-80mph to keep up with traffic. i'm up towards 3500rpms and it just gets really loud inside the car. so it kind of forces me to go 60-65 and i have to stay in the right lane.
i can't even imagine guys that have 4.25 in the back doing 5000rpms at highway speed its like screaming going slow.
