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A new transmission control system which realizes almost the same high level of operability as of a TORQFLOW (T/F) transmission (see Note 1) has been developed and introduced on an efficient HYDROSHIFT (H/S) transmission (see Note 2) for bulldozers. To develop the system, comparison and evaluation were made between H/S transmission machines without torque converter and T/F transmission machines with torque converter to ascertain the advantages and disadvantages of H/S transmission machines. As a result, the disadvantages inherent to H/S transmission machines, such as poor shifting characteristics, fine travel characteristics at low travel speed, and anti engine-stall characteristics were solved by electronically and synthetically controlling all clutches including those incorporated into the steering brake system, without sacrificing any advantages.