difficulty identifying transmission

[regcabsplz]

I have a 1994 ram with some rusty transmission lines, as far as I can tell they are intact and do not leak but I would like to replace them for peace of mind since I do drive this truck in the winter. I've read that there is two different automatic transmissions for the gas 1500 trucks but I'm not sure if I can easily rule out one or the other since mine is rear wheel drive. I also looked around on the transmission and can't seem to find any stamp or sticker that would help me know exactly which transmission I have.

also when I search for new transmission lines I can only seem to find one when I would like to replace them both.

any help or info is much appreciated.