Here are some specifications for the Komatsu D80A/D80P/D85E/D85E-18 bulldozer:
Engine: Komatsu S6D125E-2 diesel engine
Engine power: 200-235 hp (149-175 kW) depending on the model and year
Operating weight: 36,380-44,190 lb (16,500-20,050 kg) depending on the model and year
Blade capacity: 5.6-7.4 yd³ (4.3-5.6 m³) depending on the model and year
Blade width: 11-13 ft (3.4-4.0 m) depending on the model and year
Max travel speed: 6.8-8.6 mph (11-14 km/h) depending on the model and year
Max forward/reverse gradient: 30-55% depending on the model and year
Here are some specifications for the parts you mentioned:
07444-66103: Transmission assembly for the bulldozer, possibly used in the D85E-18 model
07444-66102: Transmission assembly for the bulldozer, possibly used in the D85E-18 model