Service Tax on GTA, whether credit available

yes inward freight is input services, and service tax paid on input services qualify for credit for payment towards taxable output services / excisable goods. 

 As per Rule 2(l) of the CENVAT Credit Rules, 2004 reads as under:-“input service” means any service used by a provider of taxable service for providing on output service. So u can avail the credit on the base of GAR-6 challans.

Credit would be available for inward transportation and maybe for outward.