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Thread: Rebuilt 4R70W ... Output Shaft Speed Sensor Issue?

  1. #1
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    Rebuilt 4R70W ... Output Shaft Speed Sensor Issue?

    I have two 2003 Marauders with failed 4R70W transmissions. I already had the transmission out of the first car and recently got it rebuilt. In the interim, the second Marauder's transmission failed, so I swapped the newly rebuilt transmission into the second car.

    I wanted to run it up through the gears with the vehicle on the jackstands. Reverse seemed normal. But in "D", I noticed that it didn't want to shift out of 1st Gear. Moreover, the speedometer isn't reading right. At an engine speed of 2500 RPM, the speedometer read 10 mph. I confirmed that with a scanner (which said about 9 mph at the same engine speed). Doing the math for first gear, I think the wheel speed should equate to more like 17 or 18 mph.

    I'm thinking that the normal shift schedule is prohibiting the upshifts because one of the inputs to the table is vehicle speed, and I believe I'm feeding in a faulty vehicle speed.

    I tried changing the Output Speed Sensor (OSS) from my other car into the problem car, but it made no difference. I also tried swapping in the TRS from the first car; no help.

    No trouble codes are present at all.

    I put a piece of tape on one of the rear wheels, and let the car idle in M1 position. This verified that the wheels were moving at an appropriate speed given the engine speed at idle.

    Anyone have any ideas what might cause the speedometer to be reading wrong? I have a new OSS on order from the dealership, but I'm not super hopeful, since I've already swapped in one that seems to have been working.
    Yours truly,
    Meteorite - Royal Oak, Michigan

    2003 300A - Black VIN = xxxxxxxxxxx600051 *** Build Date = 3/13/2002
    Best e.t. -- 12.31 @ 111.5 mph *** Now with: Trilogy #220, Alternative Auto Performance Tune + 4.10 Gears +SW headers + Metco control arms + Addco front and rear sta-bars + Dynotech Metal Matrix Driveshaft + Weldcraft widened wheels & MT drag radials.

    2003 300B - Blue

    And now ... 2003 Black (Trilogy #58)

    1962 Mercury Meteor & 1963 Mercury Meteor

  2. #2
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    It sounds like the reluctor for the OSS has the wrong amount of holes. You can get a tune to fix the issue. Are the calibration codes different between the 2 vehicles?

    There are either 6 or 24 teeth. You could probably remove the sensor mark one of the teeth and count them on both trans'.
    ~Chris

  3. #3
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    Yes! This makes perfect sense.

    So, here is the timeline:

    1. A few years back, I drop off this current Marauder (the one I'm working on) for a trans rebuild at my tuner's shop. Tuner removes the trans from the car and sends it out to his rebuilder.
    2. Trans rebuilder uses 4R75 (24-lug) Output Ring Gear in place of the existing 4R70W 6-hole Output Ring.
    3. Tuner re-installs the trans, notices the speedo is off by a factor of 4, and fixes it in the tune.
    4. That trans fails, so I have a 4R70W (6-hole reluctor ring) from my other Marauder rebuilt and install it in the current car, which is expecting a 24-tooth signal.
    5. Speed reads 4 times too low.

    Thanks! I'm hoping to get this fixed in the tune and be good to go. I will updated the thread if this fixes it.


    Quote Originally Posted by Blown3.8 View Post
    It sounds like the reluctor for the OSS has the wrong amount of holes. You can get a tune to fix the issue. Are the calibration codes different between the 2 vehicles?

    There are either 6 or 24 teeth. You could probably remove the sensor mark one of the teeth and count them on both trans'.
    Yours truly,
    Meteorite - Royal Oak, Michigan

    2003 300A - Black VIN = xxxxxxxxxxx600051 *** Build Date = 3/13/2002
    Best e.t. -- 12.31 @ 111.5 mph *** Now with: Trilogy #220, Alternative Auto Performance Tune + 4.10 Gears +SW headers + Metco control arms + Addco front and rear sta-bars + Dynotech Metal Matrix Driveshaft + Weldcraft widened wheels & MT drag radials.

    2003 300B - Blue

    And now ... 2003 Black (Trilogy #58)

    1962 Mercury Meteor & 1963 Mercury Meteor

  4. #4
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    Quote Originally Posted by Blown3.8 View Post
    It sounds like the reluctor for the OSS has the wrong amount of holes. You can get a tune to fix the issue. Are the calibration codes different between the 2 vehicles?

    There are either 6 or 24 teeth. You could probably remove the sensor mark one of the teeth and count them on both trans'.

    This is correct.

    We can adjust this with a tune.

  5. #5
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    Good advice here! Same thing here kind of. While my speedo was off by double or more, mine at least shifted thanks to having a manny tranny!

    Easy adjustment on the tune!


    Sent from my iPhone using Tapatalk Pro


    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  6. #6
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    Yup, ford changed them up in 2004, ran into this same issue on my Mach 1, easy fix in the tune.

    2003 has 24

    2004 has 6
    • 82 GT coyote swap started
    • 03 300a Marauder, stroked,cammed,T/S Trilogy Supercharged # 216,Best Et 10.77@129.72 on slicks, 93 pump gas. driven to the track.
    • 2011 GT 500, 3.4 whipple,93 pump gas,10.47@133,Driven to the track.
    • 2003 azura blue Mach 1, cobra motor,2.9 Whipple,crusher inlet,built 4r70w trans,04 IRS rear.full weight street car, Corn Fed

  7. #7
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    Thanks, everyone!

    I had my tuner change the parameter for me, and all is well now! Thanks!


    Quote Originally Posted by hotford View Post
    Yup, ford changed them up in 2004, ran into this same issue on my Mach 1, easy fix in the tune.

    2003 has 24

    2004 has 6
    Actually, it's the other way around. 4R75 has 24 lugs; 4R70 has 6 holes.
    Yours truly,
    Meteorite - Royal Oak, Michigan

    2003 300A - Black VIN = xxxxxxxxxxx600051 *** Build Date = 3/13/2002
    Best e.t. -- 12.31 @ 111.5 mph *** Now with: Trilogy #220, Alternative Auto Performance Tune + 4.10 Gears +SW headers + Metco control arms + Addco front and rear sta-bars + Dynotech Metal Matrix Driveshaft + Weldcraft widened wheels & MT drag radials.

    2003 300B - Blue

    And now ... 2003 Black (Trilogy #58)

    1962 Mercury Meteor & 1963 Mercury Meteor

  8. #8
    Join Date
    Sep 2006
    Location
    Psych ward
    Age
    49
    Posts
    1,031
    ^^^Correct......I knew it was one or the other, my car wouldn't shift 3 and speedo was way out, took me a bit to figure it out...….^^^^^^^^^
    • 82 GT coyote swap started
    • 03 300a Marauder, stroked,cammed,T/S Trilogy Supercharged # 216,Best Et 10.77@129.72 on slicks, 93 pump gas. driven to the track.
    • 2011 GT 500, 3.4 whipple,93 pump gas,10.47@133,Driven to the track.
    • 2003 azura blue Mach 1, cobra motor,2.9 Whipple,crusher inlet,built 4r70w trans,04 IRS rear.full weight street car, Corn Fed

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