If this is on the '55 the coils are an aftermarket add on helper springs.
G.M didn't use coil spring rear suspension other than 1960 - 1972.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022