1970 Ford Mustang Mechanical Information & Drawings

The base transmission was the 3 Speed Manual and it was a fully synchronized.

Cubic Inches	Cyl	3 Speed Manual	Select- Shift	4 Speed wide ratio.	4 speed close ratio
200	6	Standard	Optional	N.A.	N.A.
250	6	Standard	Optional	N.A.	N.A.
302	8	Standard	Optional	Optional	N.A.
351 2bbl	8	Standard	Optional	Optional	Optional
351 4bbl	8	Standard	Optional	Optional	Optional
390	8.	N.A.	Optional	Optional	Optional
428	8.	N.A.	Optional	N.A.	Optional
428 Ram air	8.	N.A.	Optional	N.A.	Optional

The fully synchronized 4 Speed Manual transmission came with a short throw shifter and a choice of close or wide ratio rears.

The SelectShift Cruise-O-Matic 3 speed fully automatic transmission came in 3 flavors. The lightweight version was the C4, the intermediate duty transmission was the FMX and the heavy duty version was the C6. The C6 can be easily identified by its integrated bell-housing and transmission cast.

Automatic Transmission Shift Speeds (MPH)

C-4 Transmission
AXLE Ratio		2.80,2.83, 3.00, 3.89				3.20, 3.25,3.50
Throttle		Minimum		Maximum		Minimum	Maximum
Range	Shift	1964 -70	1971*	1964 -70	1971*	1964 – 70	1964 – 70
D1	1-2	7 – 11	9 – 11	28 – 47	37 – 52	8 – 10	26 – 49
D1-D2	2-3	10 – 25	10 – 25	52 – 83	66 – 84	11 – 24	43 – 84
D1-D2	3-1	11 Max	—-	—-	40 – 42	10 Max	—-
D1-D2	3-1	11 Max	—-	—-	40 – 42	10 Max	—-
D1-D2	3-2	—-	—-	77 Max	80 – 82	—-	83 Max
D1	3-1	—-	10 – 11	40 Max	40 – 42	—-	33 Max
D1	2-1	—-	32 – 45	40 Max	40 – 42	—-	33 Max
Low	2-1	29 Max	—-	—-	—-	32 Max	—-
C-6 *302 2bbl Engine, 3.00:1 Axle, F78X14 tires
AXLE Ratio		3.00:1				3.50, 3.20, 3.25:1
Throttle		Minimum		Maximum		Minimum	Maximum
Range	Shift	1964-70	1971**	1964-70	1971**	1964-70	1964-70
D1	1 – 2	7 – 13	7 – 8	38 – 45	46 – 52	6 – 12	35 – 51
D1 – D2	2 – 3	11 – 21	7 – 18	72 – 82	78 – 86	16 – 20	66 – 84
D1 – D2	3 – 1 3 – 2	9 Max	7 – 8	—-	—-	9 Max	—-
D1 – D2	3 – 2	—-	—-	73 Max	66 – 77	—-	75 Max
D1	3 – 1 2 – 1	—-	—-	34 Max	34 – 41	—-	40 Max
Low	2 – 1	9 Max	22 – 30	—-	—-	9 Max	—-
Ford-O-Matic (1964 – 70) **351 4bbl, 3.00:1, F78 x 14 tires.
AXLE Ratio		3.00,3.10, 3.20, 3.25:1				3.50, 4.00:1
Range	Shift	Throttle
Range	Shift	Minimum		Maximum		Minimum	Maximum
D	1 – 2	12 – 19		45 – 60		10 – 16	36 – 52
D	2 – 1	16 Max		—-		14 Max	—-
D	2 – 1	—-		59 Max		—-	51 Max