Ford Bronco II Transmissions

Automatics	Trans Code	Year Used	Gear Ratios
C5	W	1984	1st: 2.46 2nd: 1.46 3rd: 1.00
A4LD	T	1985-1990	1st: 2.47 2nd: 1.47 3rd: 1.00 4th: 0.75
Manuals	Trans Code	Year Used	Gear Ratios
Toyo Koygo TK4	X	1984	1st: 3.96 2nd: 2.08 3rd: 1.39 4th: 1.00
Toyo Koygo TK5	5	1984-1987	1st: 3.96 2nd: 2.08 3rd: 1.39 4th: 1.00 5th: 0.84
Mitsubishi FM145	D	1985-1987	1st: 3.76 2nd: 2.21 3rd: 1.51 4th: 1.00 5th: 0.81 Reverse = 3.400
Mitsubishi FM146	D	1988-1990	1st: 3.76 2nd: 2.21 3rd: 1.51 4th: 1.00 5th: 0.81 Reverse = 3.400
Mazda M5OD	M	1988-1990	1st: 3.72 2nd: 2.20 3rd: 1.50 4th: 1.00 5th: 0.79 Reverse = 3.40
Mitsubishi FM132	?	1988-1990	5-Speed (Unknown)

All Bronco II’s Used 4×4 Transmissions:

All Ford Bronco II’s are equipped with 4×4 type transmissions. The 2wd Bronco II’s use a “dummy” transfer case.

Automatic Transmissions:

C5 Automatic:

The C5 is essentially a C4, but with a lock-up clutch in the torque converter to improve highway fuel economy. The C5 was used in the 1983-1985 4X4 Ford Ranger. The C5 is a good transmission, and was the only automatic used in a 4×4 Ford Ranger that wasn’t computer controlled.

(C5 Automatic Transmission – Click To Enlarge)

A4LD Automatic:

The C3 was modified into the A4LD 4-speed automatic by adding an overdrive gear, which the C3 lacked. This was the first Ford automatic to use an EEC-controlled torque converter lock-up clutch. Electronic shift control for the 3–4 shift was later added, another first, though other gears remained hydraulic. It was replaced by the 4R44E and 4R55E in 1995. The A4LD is a weak transmission, and is known to fail in offroading (4×4) applications.

(A4LD Automatic Transmission – Click To Enlarge)

Manual Transmissions:

Toyo Koygo (TK-4) 4-Speed Code “X”:

Overall Length of 24-Inches

Adapter length is 6.812-Inches long

Toyo Koygo (TK-5) 5-Speed Code “5”:

This is a fully synchronized overdrive transmission with a fifth gear overdrive that is set apart from the Mitsubishi 5-Speed by it’s cast, ribbed bottom cover. The case configuration is also more rounded than the Mitsubishi. The Toyo Koygo seems to be the more common of the Ranger / Bronco II manual transmissions.

Overall 4WD Length 25.937-Inches

Adapter Length 8.750-Inches

Ford P/N E57A-7003-DA

Toyo Koygo TK4 & TK5 Exploded View With Part Numbers

(Photo of TK-5 with photo of pan bottom inserted in lower left corner of photo)

Mitsubishi 5-Speed Code ‘D’:

This is a fully synchronized 5-Speed manual transmission with a fifth gear overdrive. It has a stamped metal pan on the bottom much like an automatic transmission and the main case is tapered toward the rear.

Assembled 4WD Length – 28.687-Inches

Adapter Length – 11.50-Inches

FM145 P/N E67A-7003-FA

The FM146 is 2-inches longer than the FM145

Mitsubishi FM145 & FM146 Exploded View With Part Numbers

(Photo of FM146 with photo of pan bottom inserted in upper right corner of photo.)

(Mitsubishi FM145 manual transmission)

Mazda M50D-R1 5-Speed Code “M”:

This is a top shift fully synchronized transmission. This has a light duty aluminum case and has a rectangular shape casting ribs with a large top cover. The R-2 is known for leaking oil from a rubber plug in the top cover. You should replace the rubber plug with a steel Dorman cup plug P/N 555-108 or Dana P/N 219-3052. You will need 3 plugs. These transmissions often melt down due to the oil loss caused by these plugs.

Many owners have went with synthetic transmission fluid hoping to extend the life of the transmission. Synthetic fluid handles high temperatures and pressures better then conventional fluids.

The hydraulic clutch, slave cylinder/throwout bearing is another item you should pay close attention to. After time, the slave cylinder fails to release the clutch completely. If you are having trouble shifting into 1st and reverse while stationary or if your truck creeps forward with the clutch pedal depressed the slave cylinder/throwout bearing is probably at fault. Unfortunately there is no easy fix here as the transmission must be removed to replace the combination slave cylinder and throwout bearing.

Mazda M50D-R1 Exploded View With Part Numbers