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This mod adds additional transmissions for the SCS Volvo FH4, FH5 and FH6: I-Shift Dual Clutch (SPO2812) and I-Shift ATO3512F (FH4/5)/ATO3812G (FH6) with ASO-(UL)C + ARSO-MSR. All are available with or without a retarder.
Transmissions marked "ASO-C" have one crawler gear; transmissions marked "ASO-ULC" have two. "ARSO-MSR" transmissions have two extra reverse gears, the lowest of which (RC) allows for improved maneuverability while reversing.
Recommendations
The recommended mod above is only natively compatible with the Volvo FH4. If you wish to use it with the FH5 and/or FH6, you must edit the mod accordingly.
License
This mod is licensed under the Creative Commons Attribution-NonCommercial 4.0 license. You are free to release modifications of this mod, but you must provide proper attribution (i.e. give credit) and indicate changes you made, and you may not use the mod for commercial purposes (i.e. monetization).