Tech

Manual Transmission Gear Ratio Charts for GM/Chevy Vehicles

transmission gears

Gear ratio affects a variety of driveline combinations, so it’s important to know what the gear ratios are for a gearbox you might be swapping into your ride. (Image/YourMechanic)

Because different transmission gear ratios can greatly affect a drivetrain combination, it’s important for anyone performing a transmission swap to know the gear ratios of the gearboxes you might be installing in your vehicle.

We’ve assembled a variety of manual gear ratio charts for General Motors vehicles that we hope can help you avoid choosing the wrong transmission only to discover your hot rod or truck is performing like a 19th-century horse-drawn chuckwagon, minus the delicous beans and salt pork.

Planning a manual transmission swap in your Chevy or GM vehicle? Double-check your gear ratios. Here’s a good start.

[NOTE: Not every transmission in GM’s history is listed here. It is mostly Camaro/Firebird/Corvette-focused. We’re sorry if you love a particular transmission not shown on this list. We promise it wasn’t intended as any sort of slight to the excluded GM-made transmissions.]

T-10 Four-Speed

TypeFirst GearSecond GearThird GearFourth Gear
A-code2.541.921.511.00
C-, F-code2.201.641.311.00
D-, E-, G-code2.541.891.511.00

Super T-10 Four-Speed

TypeFirst GearSecond GearThird GearFourth Gear
P-code
(wide ratio)
2.431.761.471.00
S-code
(close ratio)
2.431.611.231.00
U-code3.442.281.461.00
V-code2.231.771.351.00
W-code2.641.751.341.00
X-code2.641.611.231.00
Y-code2.881.741.331.00
Z-code3.422.281.461.00
AA-code3.291.721.001.00
BB-code4.172.281.461.00
CC-code2.881.911.331.00

Muncie M21/M22 Four-Speed

TypeFirst GearSecond GearThird GearFourth Gear
1963-772.201.641.271.00

Saginaw Three-Speed

TypeFirst GearSecond GearThird Gear
All2.541.881.00

Saginaw Four-Speed

TypeFirst GearSecond GearThird GearFourth Gear
All2.201.641.471.00

T-5 Five-Speed (Camaro/Firebird)

TypeFirst GearSecond GearThird GearFourth GearFifth Gear
1983-87 (V8)2.951.941.341.000.74
1988-92 (V8)2.951.941.341.000.73
1988-923.351.991.331.000.68
1988-923.972.341.461.000.79

T-56 Six-Speed (Camaro/Firebird)

TypeFirst GearSecond GearThird GearFourth GearFifth GearSixth Gear
1993 (wide ratio)3.362.071.351.000.840.62
1993 (close ratio)2.971.941.341.000.840.62
1994-20022.661.781.301.000.740.50

T-56 Six-Speed (Corvette)

TypeFirst GearSecond GearThird GearFourth GearFifth GearSixth Gear
1997-2007 Corvette (base)2.661.781.301.000.740.50
2001-07 Corvette Z062.972.071.431.000.840.56

ZF Six-Speed

TypeFirst GearSecond GearThird GearFourth GearFifth GearSixth Gear
1989-96 Corvette (LT1/4/5)2.681.801.311.000.750.50

T-6060 Six-Speed

TypeFirst GearSecond GearThird GearFourth GearFifth GearSixth Gear
2008-13 Corvette2.661.781.301.000.740.50
2008-09 Corvette Z512.972.071.431.000.710.57
2009 Pontiac G8 GXP2.972.101.461.000.710.56
2009-13 Cadillac
CTS-V
2.661.781.301.000.800.63
2010 Camaro SS3.012.071.431.000.840.57
2012-15 Camaro ZL12.661.781.301.000.800.63
2015-17 Chevrolet SS3.012.071.431.000.710.57
2016-17 Cadillac
ATS-V
2.661.781.301.000.790.63

M420 Four-Speed (Truck)

TypeFirst GearSecond GearThird GearFourth Gear
1957-677.203.571.701.00

M465 Four-Speed (Truck)

TypeFirst GearSecond GearThird GearFourth Gear
1968-906.543.571.571.00

NP435 Four-Speed (Truck)

TypeFirst GearSecond GearThird GearFourth Gear
All4.782.391.371.00

NV4500 Five-Speed (Truck)

TypeFirst GearSecond GearThird GearFourth GearFifth Gear
1995-20075.613.041.671.000.73
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5 Comments

  1. Jim Dalrymple says:

    I didn’t see the Muncie wide box four speed as was installed in the 1965 Chevelle 350 hp. 327 cars.

    • Craig Doescher says:

      I ran a M-21 in my Big block Chevelle with 3:55 gears. Great torque. I was shifting into 3rd around town. I then swapped a 454 in and I run an M-20 and it is much better all around. Great low but not so great highway speed. 3500 T 65 mph or so. Gear Venders is in the future

  2. How about the T&C HD 3-speed – yes, a Ford box, which was the base transmission in pretty much every GM musclecar? 1970 Buick GS455 had it…

  3. Saginaw was widely used in Pontiac and Chevy small and mid sized cars including Tempest and Camaro (among others) you totally dropped the ball on Saginaws, here’s the whole story. Saginaw 3-speed

    No Lines (grooves)

    2.85

    1.68

    1.00

    1 Line

    2.54

    1.50

    1.00

    2 Lines

    3.11

    1.84

    1.00

    3 Lines

    3.50

    1.89

    1.00

    Saginaw 4-speed

    No lines

    2.84

    2.01

    1.35

    1.00

    1 Line

    2.54

    1.80

    1.44

    1.00

    2 Lines

    3.11

    2.20

    1.47

    1.00

    3 Lines

    3.50

    2.47

    1.65

    1.00

    Read more: Transmission Ratios Chart http://www.roadkillcustoms.com/hot-rods-rat-rods/garage-shop-reference-Transmission-Ratios.asp#ixzz4wwRJejBN

  4. Hi there
    Are you aware if Chevy 1/2 ton trucks from 1980 to about 1985 were fitted with overdrive A833 New Process transmissions?
    Thanks

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