I know a good portion of my servos are Airtronics 94157 and 94158 I believe without going out and looking at them. I am pretty sure they'd work with 7.4V becsause of back in the day with running 7-cell packs. The one thing I don't know or recall is if they're considered to be digital or analog. That I'll have to look up unless someone knows off the top of their head. I went to OCRC yesterday and talked to the manager and got a pretty good education. I'm definitely excited to be back and getting back to the racing scene. I'm just not looking forward to basically having to start over and spending a ton of money. Once I get past the majority of the basics, things will settle in and won't be so bad. Thanks guys for the help. Keep the info coming.