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1955-1957 Chevrolet Transmissions

Engine Information - Transmission Information - Rear End Information - Trim Tags

1955 Transmissions
Transmission Engine/Application
3-speed Saginaw Passenger and Corvette L6 and V8
3-speed Overdrive Passenger L6 and V8
2-speed Powerglide Passenger and Corvette L6 and V8
   
Assembly Date Location
All manual Rear face of case, top right-hand corner
2-speed Powerglide Rear side of governor flange
   
Letter Prefix/Plant Transmission
C - Cleveland Powerglide
S - Saginaw 3-speed passenger, Corvette
   
3-speed gear ratios - passenger 3-speed gear ratios - Corvette
1st: 2.94:1
2nd: 1.68:1
3rd: 1.00:1
Reverse: 2.94:1
1st: 2.20:1
2nd: 1.31:1
3rd: 1.00:1
Reverse 2.20:1
   
Overdrive gear ratios Powerglide gear ratios
1st: 2.94:1 locked out / 2.058:1 locked in
2nd: 1.68:1 locked out / 1.176:1 locked in
3rd: 1.00:1 locked out / 0.70:1 locked in
Drive: 1.00:1
Low: 1.82:1
Reverse: 1.82:1
   
1956 Transmissions  
Transmission Engine/Application
3-speed Saginaw (std) Passenger L6
3-speed Saginaw (close ratio) Passenger V8 (5/9/56), Corvette V8
3-speed Overdrive Passenger L6 and V8
2-speed Powerglide Passenger and Corvette L6 and V8
   
Assembly Date Location
All manual Rear face of case, top right-hand corner
2-speed Powerglide Rear side of governor flange
   
Letter Prefix/Plant Transmission
C - Cleveland Powerglide
S - Saginaw 3-speed, overdrive
   
3-speed gear ratios - passenger 3-speed gear ratios - Corvette
1st: 2.94:1
2nd: 1.68:1
3rd: 1.00:1
Reverse: 2.94:1
1st: 2.20:1
2nd: 1.31:1
3rd: 1.00:1
Reverse 2.20:1
   
Overdrive gear ratios Powerglide gear ratios
1st: 2.94:1 locked out / 2.058:1 locked in
2nd: 1.68:1 locked out / 1.176:1 locked in
3rd: 1.00:1 locked out / 0.70:1 locked in
Drive: 1.00:1
Low: 1.82:1
Reverse: 1.82:1
   
1957 Transmissions  
Transmission Engine/Application
3-speed Saginaw (std) Passenger L6 & V8
3-speed Saginaw (close ratio) Passenger, Corvette 283
3-speed Overdrive Passenger L6 & V8
2-speed Powerglide Passenger, Corvette L6 & V8
2-speed Turboglide Passenger 283
   
Assembly Date Location
All manual Rear face of case, top right-hand corner
Powerglide Rear side of governor flange
Turboglide (early)
Turboglide (late)
Rear face of case, lower right corner
Machined boss, lower right rear face
   
Letter Prefix/Plant Transmission
B - Toledo Turboglide
C - Cleveland Powerglide
S - Saginaw 3-speed passenger, Corvette
   
3-speed gear ratios - standard 3-speed gear ratios - close ratio
1st: 2.94:1
2nd: 1.68:1
3rd: 1.00:1
Reverse: 2.94:1
1st: 2.20:1
2nd: 1.31:1
3rd: 1.00:1
Reverse 2.20:1
   
Overdrive gear ratios Powerglide gear ratios
1st: 2.94:1 locked out / 2.058:1 locked in
2nd: 1.68:1 locked out / 1.176:1 locked in
3rd: 1.00:1 locked out / 0.70:1 locked in
Drive: 1.00:1
Low: 1.82:1
Reverse: 1.82:1
   
Turboglide gear ratios  
Drive - front planetary 1.63:1
Drive - rear planetary 2.67:1