Does the noncustodial parent need to get the custodial parents permission if planning a trip across state lines. Both live in TX and the noncustodial parent is planning a trip to IN.

Depends on whether it infringes on the custodial parents time. If it does then you you need to get permission. Even if it doesn't it's a good idea to get permission or at least inform them.

You might find this thread instructive: https://www.askmehelpdesk.com/family-law/illegal-take-kids-out-state-only-2days-663919.html