My '72 with a Th350 trans started slipping really badly when I took it out of storage. It was fine when I put it away, but now it won't shift. Where should I start in trying to diognose the problem?

most likily problem is the seals have dried up. it's aforty dollar fix if you can do it yourself. luke

Fluid level with car warmed up iding in gear? Torque converter wil beed off and fuid will come out of vent tube on top of trans.