I was speaking to a mate the other day who does cab servicing, heres what he had to say;
In the state of WA, taxis aren't allowed to be more than 8 years old. Usually the cab company will pick up second hand Falcons, convert them to LPG, and put them straight into service, after installing all the cabbie gear. Servicing intervals is at 15,000km, and that usually is met every 3 - 4 weeks. These cabs are run on two shifts a day (12 hours each), with the second shift sometimes getting skipped on a Sunday, due to lack of business. Basically 24 / 7 operation. The Falcons are put out to pasture at the end of their lives, usually at the 8-900,000km mark, usually on their second motor. Some Falcons dont need a second motor apparently, if its only had conservative drivers, etc. Gearboxes last Very Well, at least, they dont pack up as often as you'd think. G/B services are at 60,000km intervals, they dont need replacing when the engine does.
I'd like to see the Commodore 3.8 and T700R4 gearbox match the 250 Crossflow / 3.9/4.0 OHC / Barra 182 and a BTR 4 speed combo.. Perhaps the HFV6 will also focus on Reliability!