Ford C6


Advance Adapters Inc Transmission Data:

Ford C6 Transmissions

Manual Transmission
Forward Speeds .... 3
Dates Produced .... 1967-1996 
Manufacturer .... Ford
Case Length .... 20.00
Stock Adapter Length ....  5.71
Bellhousing Length ... Integral
Over All Length .... 25.71
Case Material ... Aluminum
Output Shaft Spline .... 31
1st Gear Ratio .... 2.46
2nd Gear Ratio .... 1.46
3rd Gear Ratio .... 1.00
4th Gear Ratio .... n/a
5th Gear Ratio .... n/a
6th Gear Ratio .... n/a
Reverse Gear Ratio .... 2.18
Transmission Weight .... 200
Max Engine Torque .... 256
Fluid Type .... Type F or Mercon
Fluid Capacity ....  12.5 qts.
Power Take Off Capable .... no 
Gross Vehicle Weight Rated ....  
Input to Cluster Center Distance .... N/A
all measurements are in inches and pounds unless specified.
Advance Adapters Transmission Rating
Our rating is (1) being the worst and (5)being the best. 
These ratings are based on vehicles with a 10,000 GVW. Jeeps and similar vehicles that are half the weight will be well suited with transmissions rated 3 and above on the strength.
Shifting Quality ....
Strength Quality ....


The C6 is a Ford heavy duty 3 speed automatic. The gear ratio is also identical to the C4 transmission. The C6 has a case length of 20", which includes the bellhousing. This transmission was used up to all three Ford block bolt patterns. The bellhousing and case are integral (one piece); therefore, the C6 has 3 different casings.


This transmission was used in vehicles 1967 to 1996. It is a 3 speed transmission and was built around a Simpson planetary gear set. It was very similar to the C4 transmission but could handle greater power. It was used primarily in trucks, although it was also used in some larger cars with larger engines.

 The C6 was replaced by the E4OD, which was modified to include a fourth gear and electronic shift controls, replacing the hydraulic control mechanism of the C6.