is supplied to an operational chamber h2 of the second friction element c2 the second friction element c2 acting as a reaction element in a second speed stage and the hydraulic pressure in the second reverse control line 48 is supplied to the fifth friction element c5 for the above operation the 1 2 shift valve 36 comprises a first port p1 34 receiving reverse control pressure through the second reverse control line 48 when in the reverse r range a second port p2 34 receiving control pressure from the first pressure control valve 18 a third port p3 34 receiving line pressure from the shift control valve 26 through the second speed line 28 to control a valve spool of the 1 2 shift valve in second third and fourth speed states a fourth port p4 34 through which the reverse range pressure is supplied to the fifth friction element c5 and a fifth port p5 34 through which the control pressure supplied from the first pressure control valve 18 is supplied to both the 2 3 4 3 shift valve 38 and the operational chamber h2 of the second friction element c2 the 2 3 4 3 shift valve 38 is controlled by line pressure supplied through both side ports of the same valve 38 such that either control pressure supplied from the 1 2 shift valve or hydraulic pressure supplied from 3 4 shift valve in the reverse r range is selectively supplied to the release chamber h1.