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Thread: 5R55W/S Five Speed Auto Guide

  1. #1
    Advanced Tuner Screamn03's Avatar
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    5R55W/S Five Speed Auto Guide

    First thread in the Ford trans section, woot!

    I found this PDF that has alot of pictures on the 5R55W:
    http://www.ratiotek.com/tmp/5r55w-complete.pdf

    Here's some Description and Operation info:
    Apply Components

    Band-Overdrive

    During 2nd and 5th gear operation, hydraulic pressure is applied to the overdrive servo.
    This pressure causes the piston to move and apply force to the band.
    This action causes the overdrive band to hold the overdrive drum.
    This causes the overdrive sun gear to be held stationary through the adapter plate and the overdrive drum.
    Band-Low/Reverse

    During 2nd gear operation, 1st gear operation and reverse, hydraulic pressure is applied to the low/reverse servo.
    This pressure causes the servo to move and apply force to the low/reverse band.
    This action causes the low/reverse brake drum to be held.
    This action causes the low/reverse planetary assembly to be held stationary.
    Band-Intermediate

    During 3rd gear operation, hydraulic pressure is applied to the intermediate servo.
    This pressure causes the servo to move and apply force to the intermediate band.
    This action causes the direct clutch drum to be held.
    The intermediate band holds the intermediate brake and direct clutch drum to the case in 3rd gear.
    This causes the input shell and forward sun gear to be held stationary.
    Clutches-Direct

    The direct clutch is a multi-disc clutch made up of steel and friction plates.
    The direct clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
    It is housed in the direct clutch drum.
    During 4th, 5th and reverse gear application, the direct clutch is applied transferring torque from the forward clutch cylinder to the direct clutch drum.
    This action causes the forward sun gear to drive the pinions of the low/reverse planetary carrier.
    Clutches-Forward

    The forward clutch is a multi-disc clutch made up of steel and friction plates.
    The forward clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
    The forward clutch is applied in all forward gears.
    When applied, the forward clutch provides a direct mechanical coupling between the center shaft and the forward ring gear and hub.
    Clutches-Coast

    The coast clutch is a multi-disc clutch made up of steel and friction plates.
    The coast clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
    The coast clutch is housed in the overdrive drum.
    The coast clutch is applied when in 1st, 3rd, drive and reverse positions.
    When applied, the coast clutch locks the overdrive sun gear to the overdrive planetary carrier, thus preventing the one-way clutch from overrunning when the vehicle is coasting.
    This allows the use of engine compression to help slow the vehicle and provide engine braking.

    One-Way Clutch-Direct

    The direct one-way clutch is a spray-type one-way clutch that is pressed into the center shaft.
    The direct one-way clutch is driven by the ring gear of the overdrive planetary carrier.
    The direct one-way clutch holds and drives the outer splines of the center shaft in 1st, 3rd, 4th and reverse gears.
    The direct one-way clutch overruns during all coast operations and at all times in 2nd and 5th gear.
    One-Way Clutch-Low/Reverse

    The low/reverse one-way clutch is a spray-type one-way clutch.
    The low/reverse one-way clutch holds the low/reverse drum and low/reverse planetary assembly to the case in 1st and 2nd gear.
    In all other gears the low/reverse one-way clutch overruns.
    Geartrain
    Power is transmitted from the torque converter to the planetary gearsets through the input shaft. Bands and clutches are used to hold and drive certain combinations of gearsets. This results in 5 forward ratios and 1 reverse ratio, which are transmitted to the output shaft and differential.

    Gear Ratio
    1-3.22
    2-2.29
    3-1.55
    4-1.00
    5-0.71
    R-3.07

    Planetary Gearset-Overdrive

    The planetary gear overdrive carrier is driven by the input shaft.
    The overdrive planetary gearset carrier drives the center shaft via the overdrive one-way clutch in 1st, 3rd, 4th and reverse gears.
    In 2nd and 5th gears, the overdrive sun gear is held causing the pinion gears to rotate around the overdrive sun gear.
    The pinion gears, in turn, drive the overdrive ring gear resulting in the 5th (overdrive) gear ratio.
    The overdrive planetary gearset is internally splined to the coast clutch for engine braking.
    Planetary Gearset-Forward

    The forward planetary gearset is splined to the output shaft.
    The forward planetary gearset is driven by the forward ring gear when the forward clutch is applied.
    The forward planetary gearset pinions drive the forward sun gear.
    The forward sun gear is splined to the input shell.
    The forward carrier is splined to the output shaft.
    Planetary Gearset-Low/Reverse

    The low/reverse planetary gearset is connected to the reverse brake drum by lugs from the low/reverse brake drum to the lugs of the low/reverse planetary gearset.
    The low/reverse planetary gearset is driven by the forward sun gear which is splined to the input shell.
    The forward sun gear drives the pinions in the low/reverse planetary gearset.
    The pinions of the low/reverse planetary gearset drive the output shaft ring gear and output shaft hub which is splined to the output shaft.
    The low/reverse planetary gearset can be held by the low one-way clutch in the low/reverse brake drum, or by the low/reverse band.
    Input Shaft
    The radial positioning of the input shaft is controlled by 2 bushings in the stator support.
    Axial positioning of the input shaft is controlled by the splines in the converter turbine hub and the retaining ring in the overdrive planetary carrier.
    Output Shaft

    The output shaft is supported by a bearing in the case and by a bearing in the extension housing. End positioning is controlled by the parking gear and by the reverse ring gear hub and snap ring.
    The PCM has an adaptive learn strategy to electronically control the transmission which will automatically adjust the shift feel. When the battery has been disconnected, or a new battery installed, certain transmission operating parameters may be lost. The PCM must relearn these parameters. During this learning process you may experience slightly firm shifts, delayed or early shifts. This operation is considered normal and will not affect the function of the transmission. Normal operation will return once these parameters are stored by the PCM.
    Here's an exploded diagram:
    http://www.screamn03.com/5R55S_Exploded_Diagram.pdf

    Attached is possible part number listing.
    -Michael Rudolph-
    2003 Redfire Cobra
    Eaton Powered to a:
    11.301 @ 129 1.68 60' MT DRs
    11.85 @ 124 1.90 60' street tires

  2. #2
    Advanced Tuner Screamn03's Avatar
    Join Date
    Feb 2004
    Location
    Vacaville, CA
    Posts
    833
    I usually like to know how something works before I begin to alter it.