Oni Tools FR-Series Transmission Timing Block: Elevate Your Assembly Precision Unlock unparalleled precision and durability with the Oni Tools FR-series Transmission Timing Block – the direct replacement for the OEM part RR1025TR. Designed to perfection, this indispensable tool revolutionizes the assembly process for Eaton Fuller FR-series transmissions by providing exceptional support to the upper countershaft during main box assembly.