.69 is it, no aftermarket gear sets....
The A500 has a lower 1st & second gear than the A518....
A500 1st 2.67 2nd 1.54 Drive 1.00 O/D .69
A518 1st 2.45 2nd 1.45 Drive 1.00 O/D .69
Most guys try to avoid the lock up convertor models, I see that as a mistake... L/U convertor reduces Engine RPM at cruise & has no effect on low speed driving... Actually it frees you up to use a looser convertor without the penalty of slippage/heat at highway speeds...
Honestly the deeper first gear of a A500 means you could drop 3.91's in the axle & lose nothing but gain on a cruising speed end of the equation