the AOD doesn't have a bellhousing that will unbolt.
The C4 and the a4ld do but you have to do a pretty extensive swap.
A good upgrade is an a4ld for your car but with explorer internals. Eventually it'll break too though. C4 or 5spd the the strongest two options, you could build a C4 to take more than a 2.3 will ever put out.
By the way I have the bellhousings for the C4 for sale
