Ford Drivetrain Ratio's
 


FORD  AUTOMATIC  TRANSMISSION  GEAR  RATIO'S

TRANSMISSION 1ST 2ND 3RD OD REVERSE
AOD 2.40:1  1.47:1  1.00:1 0.67:1  --
AOD (wide ratio) 2.84:1 1.55:1 1.00:1 0.70:1  --
AOD-E 2.40:1 1.47:1 1.00:1 0.67:1  --
AOD-EW 2.84 1.55  1.00 0.70
C-4 2.46:1 1.46:1 1.00:1  --  --
C-6 2.46:1 1.46:1 1.00:1  --  --
C-6 (wide ratio) 2.72:1 1.54:1 1.00:1  --  --
E4OD 2.71:1 1.54:1 1.00:1 0.71:1 2.18:1
4R70W 2.84:1 1.55:1 1.00:1 0.70:1  --

for a Bronco, the transmission code will be either a,  K, T, M, Z, or F.
K  - C6
T  - AOD
M - M5OD
Z  - M5OD-HD
F  - manual 4-speed.


*Notes

James Poore wrote:
    For you guys with AODs: The AOD is a unique (being generous here) design. The input shaft is a two piece affair with a small inner shaft and a larger outer shaft. 1-2 transmits power through the outer shaft. 3rd splits the torque, unequally, to both shafts, and 4th runs through just the center shaft. The TC has a hydraulic lockup actuator and 3-4 are both locked, so there is no slippage in 3rd and 4th. The AOD would tow like a manual in this regard. The problem is the center shaft is the weaker of the two. OD runs all torque through it, so fatigue MAY be a problem.
    I tow in OD when the engine can pull it. With 33's and 3.55's, I figure I'm not making a lot of torque at OD RPM anyway, but you guys who tow in the owerband may. BTW, I have a 5.8L. I like to downshift before a hill so that the 3rd clutches don't have to take a shift at nearly WOT. Just my $.02.

Rade Spasojevic wrote:
Well here is the list of upgrades (at least what I remember) when I got my AOD bebuilt.
        -Wide ratio gearset
        -HD one-way clutch
        -HD clutch plates
        -Type "A" OD servo
        -Wider OD band


FORD MANUAL TRANSMISSION GEAR RATIO'S

TRANSMISSION 1ST  2ND  3RD 4TH 5TH  REVERSE
M50-HD (ZF) 5.72:1 2.94:1 1.61:1 1.00:1 0.76:1 5.24:1
M50D 3.40:1 2.94:1 1.61:1 1.00:1 0.76:1  --
NP435  6.69:1 3.34:1  1.79:1  1.00:1  --  --
T18  6.32:1 3.09:1 1.69:1 1.00:1  --  --
Tremec 3.25:1  --  --  -- .78:1  --
ZF S5-42 5.72:1  --  --  -- .76:1  --

TRANSFERCASE GEAR RATIO'S

T/CASE LOW RANGE HI PART / FULL TIME GEAR/ CHAIN YEARS USED
4 - TO - 1 4.00:1 1.00:1  --  --  --
ATLAS  3.60:1 1.00:1  --  --  --
BW1345 2.72:1 1.00:1 Part-Time Chain  ‘80 - ‘88
BW1356 2.69:1 1.00:1 Part- Time Chain ‘87 - ‘96
DANA 20 2.00:1  1.00:1  --  --  --
NP200 2.69:1 1.00:1  --  -- ‘93 - ‘96 ??
NP203 2.00:1  1.00:1 Full- Time Chain  ‘78 - ‘79
NP205 1.98:1  1.00:1 Part-Time Gear ‘79 - ??
NP208 2.61:1  1.00:1 Part-Time Chain  ‘80 - ‘86
NV271  2.72:1  1.00:1  --  --  --


 



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Last updated on May 10/2003