Quote:
Originally Posted by beemergary
Guy's I am looking for results from anyone who has made the change from 248/148 to 275/157 first and second gears. Not really wanting to spin engine at more rpm's at top end.
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I changed the th400 in my firebird to the 2.75 for the same reason (not wanting to increase trap rpm but wanted to lower 60' times). 69 Firebird, 3.90 gear, 389, iron heads, full exhaust and interior. 60's went from mid 1.70's to 1.66/1.68 with no other changes.