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A track driven vehicle has an undercarriage transmission assembly that has a central transmission housing forming a one piece all welded housing. The central transmission housing has upright side wall portions with multiple layers of plates or walls in a sandwich construction on which drive motors a

A track driven vehicle has an undercarriage transmission assembly that has a central transmission housing forming a one piece all welded housing. The central transmission housing has upright side wall portions with multiple layers of plates or walls in a sandwich construction on which drive motors are mounted. The drive motors are on the interior of the transmission housing, with track driven sprocket assemblies on the exterior of the side walls. Track mounting pods or frames are welded to the exterior of the side walls of the transmission housing.

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What is claimed is: 1. A welded transmission assembly for a track driven vehicle comprising a transmission housing having a pair of spaced apart side walls, a bottom wall joining said side walls, first and second track frames welded to exterior sides of the respective side walls, each of said side

What is claimed is: 1. A welded transmission assembly for a track driven vehicle comprising a transmission housing having a pair of spaced apart side walls, a bottom wall joining said side walls, first and second track frames welded to exterior sides of the respective side walls, each of said side walls having an uprightly extending motor mounting flange adjacent one end thereof, a separate reinforcing plate welded to an interior side of each of the motor mounting flanges of the side walls, a welded gusset brace extending from an exterior side of each of the motor mounting flanges to the respective track frame, and a brace plate welded on the exterior side of each of the side walls adjacent the gusset braces and each brace plate having a portion at least partially extending along the respective motor mounting flanges. 2. The transmission assembly of claim 1, wherein said bottom wall is initially formed in two bottom wall sections separated along a longitudinal length, each of the sections of the bottom wall being integral with a respective one of the side walls, and a longitudinal junction of edges of the bottom wall sections being welded together, substantially along a center line of the transmission housing. 3. The transmission assembly of claim 1, wherein said first and second track frames comprise inverted track frame channel members each having a top wall and channel side walls extending downwardly from the top wall, the track frame channel members being attached by welding to the side walls of the transmission housing. 4. The transmission assembly of claim 2 and a first end cross wall welded to the side walls and the bottom wall at an end of the transmission housing spaced from the motor mounting flanges. 5. The transmission assembly of claim 4 and a second end cross member welded to and extending between the side walls adjacent to the motor mounting flanges. 6. The transmission assembly of claim 1 further comprising an inverted central channel member on an upper side of the bottom wall, said inverted central channel member having a top wall and channel side walls having edges welded to the bottom wall, the inverted central channel member being between and spaced from interior surfaces of the side walls. 7. The transmission assembly of claim 1 further comprising a pair of side panels of a main upper frame, each of the side panels of the main upper frame having a side panel portion positioned on an exterior side of one of the motor mounting flanges of the side walls and extending around a portion of an opening in the motor mounting flange for a respective motor and positioned above a portion of the respective brace plate; the reinforcing plates, the motor mounting flanges, the portions of the brace plates and the side panel portions of the main upper frame all having holes for fasteners to clamp a motor and the respective motor mounting flange, reinforcing plate, portion of the brace plate and side panel portion together. 8. The transmission assembly of claim 7, wherein the side panel portions of the main upper frame are substantially the same thickness as the portions of the brace plates and are positioned directly above an upper edge of the respective portion of the brace plate, the portions of the brace plates extending substantially half way up along opposite sides of an opening for the respective motor. 9. The transmission assembly of claim 3, wherein said inverted track frame channel members each includes a cross wall panel positioned below the top wall thereof and extending between the inverted track frame channel side walls, and welded to the channel side walls. 10. The transmission assembly of claim 3, further comprising lateral wall spacers between the inverted track frame channel members and the respective side walls of the transmission housing, the spacers between the side walls of the transmission housing and a respective inverted track frame channel side wall comprising a pair of generally horizontal wall sections extending between the respective inverted track frame channel side wall and a side wall of the transmission housing. 11. A transmission assembly for a motor driven vehicle comprising a transmission housing having a pair of spaced apart side walls with motor mounting portions, said motor mounting portions having motor openings therethrough for mounting motors having motor portions that extend through the side walls from an interior side to an exterior side, a reinforcement plate on the motor mounting portions welded to each of the side walls on an interior side of the motor mounting portions and having an opening aligning with the motor opening in the associated motor mounting portion of the associated side wall, and a brace plate flange portion on an exterior side of each of the motor mounting portions extending part way up along an exterior of the respective side wall and having a recessed opening aligning with a lower portion of the motor opening in the respective motor mounting portion of the respective side wall, and an upper frame panel on an exterior side of the each of the side walls, said upper frame panels each having a partial cut out aligning with the motor opening in the respective motor mounting portion of the respective side wall, a plurality of openings for fasteners aligning with fastener openings for a motor to permit fasteners to be inserted to hold and clamp a motor, the motor mounting portion, the reinforcing plate, the brace plate flange portion and the upper frame panel at each motor mounting portion together when mounting a motor. 12. The transmission assembly of claim 11 wherein the side walls are spaced apart to permit motors to extend inwardly from the interior sides of the motor mounting portions. 13. The transmission assembly of claim 11, further comprising a separate track frame welded to an exterior side of each of the side walls at a level below the motor mounting portions. 14. The transmission assembly of claim 11 and a bottom wall integral with and extending between the side walls of the transmission housing. 15. The transmission assembly of claim 14 and a longitudinally extending inverted central channel having spaced central channel side legs welded to an upper side of the bottom wall along longitudinal junctions between the spaced channel side legs of the inverted central channel and the bottom wall. 16. A method of manufacturing an undercarriage transmission for a work vehicle comprising forming a transmission housing having a bottom wall and spaced upright housing side walls joined to the bottom wall, providing motor mounting portions on the housing side walls, welding cross wall members to front and rear ends of the housing side walls, welding a longitudinally extending inverted channel to the bottom wall with channel side walls of the inverted channel spaced from the housing side walls, and welding reinforcing members between the housing side walls and the channel side walls of the inverted channel. 17. A method of manufacturing an undercarriage transmission for a vehicle comprising forming a transmission housing having a bottom wall and spaced upright side walls joined to the bottom wall, welding cross wall members to front and rear ends of the side walls, welding reinforcing between the side walls, including forming the bottom wall as two longitudinally extending bottom wall sections, and welding the bottom wall sections together along a junction of edges of the bottom wall sections and thereby spacing the side walls apart, before welding the cross wall members to front and rear ends of the side walls. 18. A method of manufacturing an undercarriage transmission for a vehicle comprising forming a transmission housing having a bottom wall and spaced upright side walls joined to the bottom wall, welding cross wall members to front and rear ends of the side walls, welding reinforcing between the side walls, and providing motor mounting portions on the side walls having openings for mounting a motor on each motor mounting portion, welding a reinforcing plate on an interior side of each motor mounting portion, and providing the reinforcing plates with openings matching openings for mounting motors in the respective motor mounting portion. 19. The method of claim 18 further characterized by welding track frames to exterior sides of the side walls of the transmission housing. 20. A transmission assembly for a motor driven vehicle comprising a transmission housing having a pair of spaced apart side walls with motor mounting portions, said motor mounting portions having motor openings therethrough for mounting motors having motor portions which extend through the motor openings, a separate reinforcement plate on each of the motor mounting portions welded to each of the side walls on an interior side of the motor mounting portions and having an opening aligning with the motor opening in the associated motor mounting portion of the associated side wall, and a brace plate flange on an exterior side of each of the motor mounting portions extending at least part way up along an exterior of the respective motor mounting portion of the respective side wall and having a opening aligning with at least a lower portion of the motor opening in the respective motor mounting portion of the respective side wall, a plurality of openings for fasteners in each motor mounting portion, reinforcing plate and brace plate flange positioned to align with fastener openings for a motor to be mounted on the transmission assembly to permit fasteners to be inserted to hold and clamp a motor, the motor mounting portion, the reinforcing plate and the brace plate flange together when mounting a motor on the respective motor mounting portion.