Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# 08-07-30-034.
Affected Component: POWER TRAIN:AUTOMATIC TRANSMISSION
GMC: 4T45-3 AUTOMATIC TRANSMISSION (RPO MN5/ME7) - NO REVERSE, BINDS IN REVERSE, NO MOVEMENT, DTC P0756 (PERFORM APPROPRIATE REPAIR AS OUTLINED IN BULLETIN). ON SOME HYBRID AND NON-HYBRID VEHICLES. *PE
