Real eaton Fuller 13 and 18 spd for Peterbilt 389

For those whow whant a real feel for their brand New Peterbilt 389!
tested on Viper2 389
How to use : simply copy the scs file in your mod folder and select one of the two Gearbox in service center!

first version : 
added eaton fuller 13 and 18 spd with or without Retarder
by default the rear ratio is setted to 3.36 which is the lowest I could find for a 389... at 55mph on last speed the rpm sit near 1200 rpm and 65mph at 1400rpm
I'have also provided all the stock ratio I could find in the def file so you could change them (it really easy with a text editor

TO DO : 
add gearbox to stock SCS truck 
Custom shift pattern for both gearbox
custom mod image and gearbox picture in shop