34 on 34 during engine start the spring load on converter lock up clutch 40 is only of sufficient capacity to drive transmission fluid pump 18 for hydraulically engaging clutch brake 46 the speed of accessories 13 would immediately rise to the 2 1 overdrive ratio converter lock up clutch 40 would then be hydraulically released in 34 neutral 34 as well as in any other desired condition including vehicle coasting or engine braking because of the mechanical torque feedback to sun gear 36 tending to assist driving turbine 32 turbine 32 is partially unloaded depending on the load of accessories 13 this tends to raise slightly the apparent coupling point 38 and so converter lock up clutch 40 can now be applied at a slightly higher speed ratio than normal with a smaller speed differential existing between impeller 30 and turbine 32 at the clutch shift point the shift would feel smoother ccad 12 has application to both front wheel drive and rear wheel drive vehicles with an automatic transmission in rear wheel drive applications as shown in fig7 a spoked member 60 connecting turbine 32 and ring gear 28 must pass through the converter flow path between impeller 30 and stator 31 spoked member 60 only carries the drive torque of accessories 13 and would be of light construction this configuration could also be employed for the front wheel drive u drive automatic transmission but the simpler arrangement as shown in fig2 is preferred otherwise the operation of ccad 12 for rear wheel vehicles is similar to that of.