CHANGES VER 2.0:
Windows animation update (REALLY BIG THANKS TO @Kororuz !!!)
Various def file fixes & changes
New engines added (DD60, ISX15 & N14); if you select a pre-emissions engine, it will update the battery box to a non-DEF version
Various Engine Sound Updates
New Paint Job included (template link in description)
Compatibility with SCS Western Star dealerships
Quick Jobs changes

CHANGES VER 1.4:
Basic 1.37 Compatibility (cleared log errors/removed obsolete attributes)
Updated Engine Defs
Incorporated Engine Sounds by Robinicus
Window animation is still WIP

CHANGES VER 1.3:
Adds Beacons to Flattop Cab
Moves the Fifth Wheel forward on the Long and 8x4 Chassis to fix the severe understeer with heavy/oversize loads
Axle weight adjustments on the Long and 8x4 Chassis
Fuel Tank size corrections for all chassis
Addition of correct Air Tank and DEF Tank values for all chassis
Texture change on A-Pillars to eliminate Skin/UV issues in interior views

EDIT:
There are several big chassis updates in Version 1.3  You *MAY* have to sell/re-buy your truck!

Link 3 SISL Patch
Link 4 Template


Credits:
YukonJack_AK - This Patch
Sib3rius (and Team) - The original 4900FA mod
Kishadowalker - Permission to use an old version of the 4800SB series interior as a skeleton and the basis for the new interior.
Galimim & Wilson212 - For engine and transmission DEFs
Kreichbaum - For the engine sounds
HFG Guidot - Without your Youtube videos, I'd still be trying to even figure out how to even convert and import a model, let alone do anything with it
SCS