Originally Posted by jdick2
I am trying to figure out what the gear ratio is to my '10 JK sport with auto.
You have 3.73s. Unless it's been regeared, there's no other option. Pre-2012, all
autos (absent Rubis and a handful of 2007s) came with 3.73s.
Originally Posted by pdubois64
I just got my build sheet for my 2012 and it says I have 3:21 gears but I have automatic transmission
My 09 with auto had 3:73's
Is it for sure that all auto trans are 3:73? maybe it isn't reflected on the build sheet.
No. Starting in 2012, 3.21 is the default ratio for autos is 3.21. So absent a mistake on your build sheet, you have 3.21s.