Volvo VNL 2018 I-Shift Improved Transmissions

Update: v2.1 Added non-retarder variants.   This mod based on real spec adds rear axle ratios for Volvo VNL 2018 with I-Shift transmisions: Meritor S-Fast – 2,28; Meritor FUELite+ – 2,47; Volvo XE – 2,64; Volvo XE Fleet – 2,85; Meritor FUELite – 3,06; Added retarder on default I-Shift transmisions; mp_mod_optional: true.   https://www.paypal.com/donate/?hosted_button_id=MB39A8JBM4ZGN   Credits KnightRider