An all terrain endless track vehicle of the present invention comprises a front suspension assembly and a rear endless track assembly supported by a chassis. The front suspension assembly is engageable with the ground by a steerable set of skis or wheels. The endless track assembly supports an engine, transmission and first and second shock absorbers. The first shock absorber connects to the endless track assembly forward of the engine, while the second shock absorber connects to the endless track assembly rearward of the engine. A rear swing arm supports a rearwardly positioned main driver mechanically linked to the transmission by way of a chain or belt. A plurality of idler wheels disposed on the endless track assembly, along with the main driver, define an endless track contour. An endless track or belt disposes on the plurality of idler wheels and the main driver. The engine, transmission, and shock absorbers are each contained within the contour of the endless track.