Transmissions

By: Charles E. Giannetta




PONTIAC offered 4 different Transmissions for the 69 Grand Prix


Transmission Type 1st Gear ratio 2nd Gear ratio 3rd Gear ratio 4th Gear ratio Reverse Gear ratio

3 Speed Automatic

Turbo Hydra-matic 400 M40

2.48:1

1.48:1

1.00:1

n/a

2.08:1

3 Speed Manual

M13

2.42:1

1.61:1

1.00:1

n/a

2.33:1

4 Speed Manual

M20 Wide Ratio

2.52:1

1.88:1

1.46:1

1.00:1

2.59:1

4 Speed Manual

M21 Close Ratio

2.20:1

1.64:1

1.28:1

1.00:1

2.27:1

n/a = Not Available


THM 400

The THM-400, first appeared in 1964, on GM's Cadillac and Buick, and was the ONLY automatic used on the Grand Prix for 1969. It was a very durable transmission and got the "400" in its name, based on the nominal amount of torque capacity it could handle, which is 400lb-ft.

Today, they are in much demand for the Hot-Rodders and Drag racers!

If you give them regular maintenance, they should last forever!

This Transmission was an OPTION for the 1969 Pontiac Grand Prix



M13 3 Speed Manual

This transmission came as "Standard" on all 1969 Grand Prix's

Saginaw and Dearborn both made the 3 speed manual, but the Dearborn was ONLY used in the 1969 Grand Prix line. The gears are housed in a basically indestructable cast-iron housing. It is fully-synchronized in all gears, except the reverse gear, which is in constant mesh.



M20 Wide Ratio 4 Speed Manual

This transmission came as an "Option" on all 1969 Grand Prix's

Saginaw, Borg-Warner, and Muncie, made the 4 speed manual, but the Muncie was ONLY used in the 1969 Grand Prix line.



M21 Close Ratio 4 Speed Manual

This transmission came as an "Option" on all 1969 Grand Prix's

It is identical to the M20, but with different gear ratios



For more information on the Muncie Transmission

Check out this site!

Muncie History





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