That's a loaded question. All depends on how hard you're going to drive the car. An AOD is only as good as it's built. Based on the fact your tapped out on funds to rebuild the trans with better internals or buy a trans I would reframe from 1-D-1 shifting, foot braking, or simply hard acceleration.
However, if you want to increase the life of your trans install a tranny cooler and change the trans filter and fluid often.
I went through (2) trans on a totally stock motor in a month. But, I beat the piss out of them. I put in a Trans-Go shift kit in the second trans and it worked awesome for the first 100 miles, until the bands couldn't take the neck snapping shifts. But that could've been simply due to the unknown mileage on the trans. The last AOD was out of a Mark VII. I had the driveshaft shortened to make up for the longer tailshaft, put in a Lentech VB
, 2800 rpm stall converter, tranny cooler and that setup (surprisingly) took everything I threw at it even countless 125hp shot of nitrous on slicks.
An AOD can be built to last and hold a lot of torque. You just have to have it built to meet your demands.
'89 LX, 6#PD, 11.63@117, stock block & cam (soon to be S-Trim'd)
'88 GT, 12.40@110, AOD, 125HP NOS, 194K miles on stock block.