Will the axles from a 8.2 bop rearend from a 68 firebird fit into a rear end carrier from a 66 Chevelle 8.2?

The axles from a 1968 Firebird with an 8.2 rear end will not fit directly into a 1966 Chevelle 8.2 rear end. While both rear ends share similar design characteristics, the axle lengths and splines can differ between models and years, particularly given the different body sizes and suspension setups. It is essential to verify the specific measurements and compatibility of the axles and carriers before attempting a swap.