yep, poncho's got it. b4 1955, there was 2 gear ratio's 4.10's for 3spd manuals and 3.55's for the PG's, but in '55 when the V8 came out, many ratio's were available.
A stock '55 with powerglide would have got a 3:36, possibly a 3:55 rear end.
There was some change between '56 and '57 so it is possible the '55/56 got a 3:55 rear.
I know for a fact my '57 with original 283, powerglide has a 3:36 rear in it.
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