Can it be done and what would it require? I have a really good reliable 3F Toyota motor in my comp truck on straight lpg its great was rebuilt a few years back now and is better than ever now its breathing gas dose not miss a beat. The problem is i am chewing through cromo axles and i think an auto will help this and also be easier to drive. So i have a good C4 auto here how and what needs to happen for it to mate to the 3F? Before you say it no i don’t want to swap to bigger diffs or motor swap till i look at this opinion.