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The only real difference in the body is that the 77 grille had honeycomb inserts and the 78 were diamond shaped. The 78 was available with an 8" Snowflake wheel instead of just the 7". The 78 was also the first year for the WS-6 option. This included quicker steering ratio, stiffer suspension, 8" wheels...etc.

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Q: Difference between a 1977 Trans Am and a 1978 Trans Am?
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