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Oldsmobile Transmission
Identification and Gear Ratios

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Other model series transmissions are included on this page, in the event your original transmission was, at some time, swapped for a different version. All listings ARE still for the '67 model year, however.

3-speed manual column-shift is standard.
3-spd (M14) or 4-spd Hurst floor-shift is available.
3-spd Turbo Hydra-Matic column-shift is available.
3-spd Turbo Hydra-Matic floor-shift is available on console-equipped 4-4-2 models.

Jetaway Transmission Code LocationJetaway Transmission

Transmission MODEL and CODE NUMBERS are stamped on the servo cover (see graphic at right). The first two digits represent the model year, the next two letters represent the transmission model (see table below) and the last three numbers are the sequential production numbers.
Example:  67 LC 001

Model Series and Engine Usage
LC L-6 in 33300 and 33500 Series (Fixed Stator)
ML V-8 330 cu. in. 2-bbl. in 33400, 33600 & 33800 (Except V.C.)(Variable Stator)
MK V-8 330 cu. in. 4-bbl. in   33400, 33600 & 33800 except with L-77 or L-78 opt. (Variable Stator)
MT V-8 330 cu. in. 2- & 4-bbl. in 35200 Series (Delmont 88)

NOTE: From 64-67, you often found variable pitch torque converter automatic transmissions on Cadillac, Buick, Olds. Racers call them "switch-pitch" transmissions. Basically, there's a little stator turbine in between the two main turbines of the converter. The angle (pitch) of the stator blades is changed electronically. This changes the flow of fluid, thus changing the stall speed of the converter.

There are two settings: high stall and low stall. This was a design used to get those big cars moving faster. At idle or full throttle, the high stall setting kicks in, giving smooth idle or greater acceleration. At just off throttle, the low stall speed is set for better mileage during normal driving.

GM discontinued the idea due to high cost. There are still some aftermarket converter makers who sell converters for these transmissions for racers and such.

Turbo Hydra-Matic Serial Number LocationTurbo Hydra-Matic Transmission

The Turbo Hydra-Matic serial number is stamped on a plate located on the right side of the case (see graphic at right). The first two digits represent the model year, the next two letters represent the transmission model (see table below) and the last three numbers are the sequential production numbers.
Example: 67-OB-1402

Starting Serial No. Series or Engine Usage
67-OA-1001 3465, 3855, 3865 Series, 2- and 4-bbl.
67-OB-1001 5400, 5600, 5800, 8400 & 8600, All Bbl. except L-65, L-90, L-75, L-77
67-OC-1001 5400, 5600, 5800 V-8 2-bbl. with L-65, L-90
67-OD-1001 5400, 5600, 5800, 8400, 8600, V-8 with L-75
67-OE-1001 5600, 5800 V-8 with L-77, 5400, 5600, 5800, 8400, 8600 V-8 2- and 4-bbl.
67-OF-1001 5200 V-8 2- and 4-bbl.
67-OG-1001 3400, 3600, 3800 V-8 4-bbl. with L-77, L-78
(except 3465, 3667, 3855, 3865 & L-66)
67-OH-1001 3807, 3817 &3867 with L-66
67-OJ-1001 9400 & 9600 V-8 4-bbl.
Transmission Availability
Transmission Controls Cutlass Supreme Cutlass F-85

Column Shift

Turbo Hydra-Matic, Reg. (M40) Available (1) - -
Turbo Hydra-Matic, H.D. (M41) - - -
Jetaway, Reg. (M33) (M31) Available (2) Available (3) Available (3)
Jetaway, H.D. (M34) Available Available (4) Available (4)
3-spd Man., Reg. Standard Standard Standard
3-spd Man., H.D. (M13) Available - -
Console Shift (6)
Turbo Hydra-Matic, Reg (M40) Available (5) - -
Turbo Hydra-Matic, H.D. (M41) - - -
Jetaway, Reg. (M33) Available (2) - -
Jetaway, H.D. (M34) Available - -
3-spd Man., H.D. (M13) Available (5) - -
4-spd Man. (M20) (M21) Available (7) Available (7) -

Floor Shift

3-spd Man., H.D. (M14 Available Available (4) Available (4)
4-spd. Man. (M20) (M21) Available (7) Available (7) Available (4,7)
  • (1)  With 4-4-2 Performance Package (L78) included in Turnpike Cruising Package (L66)
  • (2) Except Jetaway Regular (M33) not available with 4-4-2 Performance Package (L78)
  • (3) Fixed-Stator Jetaway (M31) with Action-Line 6 Engine
  • (4)  V-8 models
  • (5)  With 4-4-2 Performance Package (L78)
  • (6) Restricted to cars with bucket seats
  • (7)  Wide gear ratios (M20); special gear ratios (M21)

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Manual Transmission Identification



Code R.H. Side of Case Option Code
3-Speed 3300, 3500 L-6 Column Shift QP -
3400, 3600, 3800 Column Shift RJ -
3-Speed Heavy Duty 3400, 3600, 3800 V-8 H.D. Floor Shift
(Except 3435, 3465, 3635, 3855, 3865)
DB M-14
3400, 3600, 3800 V-8 H.D. Column Shift
(Except 3435, 3465, 3635, 3855, 3865)
DB M-13
5200, 5400, 5600, 5800 V-8 Column Shift DA -
4-Speed 3400, 3600, 3800 Floor Shift (wide ratio) HP
(Top of Case)
3400, 3600, 3800 Floor Shift (close ratio) HF
(Top of Case)
Manual Transmission Ratios

Cutlass Supreme,
Cutlass V-8,
F-85 V-8

Cutlass Six,
F-85 Six

3-Speed Column-shift
First 2.54-to-1 2.85-to-1
Second 1.50-to-1 1.68-to-1
Third 1.00-to-1 1.00-to-1
Reverse 2.63-to-1 2.95-to-1
Heavy-duty 3-Speed
Floor-Shift (M41) (1)
First 2.42-to-1 N/A
Second 1.61-to-1
Third 1.00-to-1
Reverse 2.33-to-1
4-Speed Floor-Shift (M20) First 2.52-to-1 N/A
Second 1.88-to-1
Third 1.46-to-1
Fourth 1.00-to-1
Reverse 2.6-to-1
Special Ratio (Close Ratio)
4-Speed Floor Shift (M21)
First 2.20-to-1 N/A
Second 1.64-to-1
Third 1.28-to-1
Fourth 1.00-to-1
Reverse 2.27-to-1
(Diameter / pressure-spring type)
Standard 10.4" / Flat 9.12" / Flat
Heavy-duty (M01) 11.0" / Flat N/A
(1) Except Station Wagons

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This page last modified on April 05, 2008.