Talk to a transmission shop and ask which make/model MV they typically work on. It bet it will come up Chrysler.
They are the volume leader, so no surprise there. The newer vans, with whatever internal updates were done to the transmission over the years and now with ATF+4, are very reliable. The 3.3L and 3.8L engines are bulletproof.
More than likely, the engine and transmission will outlast the rest of the van. My '99 GC 3.3L is still running great at 183K miles. I did do an Auto-RX treatment on the transmission and it fixed a cold start engagement problem. Now it shifts like a new van. It's my intent to get 300K miles out of the van, another 6 years to go.