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 |
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