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Ford c6 transmission not shifting???

I have a 1986 F-250 with a C6 and it will not shift when in drive also it blows out the tail stock seal???

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  • darrenlingar Sep 09, 2009

    seems fine would that cause the no shift? Or is it the throttle valve? Modulator seems fine!!

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You may have a block trans air vent which may explain the blown seal and may also fect shifting

Posted on Sep 09, 2009

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Ford f250 1989 diesel c6 transmission Loud unregular noise, not driving, running idle, shift and drive normal. Sounds like parts loose in gearbox.


See if it the torque converter making the noise. Ford had these converters take would make like a rattle/clicking noise. Not sure if they went back that far though. The noise doesn't hurt anything. Every thing still works fine. It was just annoying.

Jul 04, 2015 | Cars & Trucks

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1990 F150 tranny won't shift up. put in new tranny worked for about 30 miles.


This could be several different issues. It could be the detent linkage if it is a C6 transmission, It could be the solenoids if it is an AOD. It could be a speed sensor if it is an electronic shift transmission.

Dec 02, 2013 | Ford Cars & Trucks

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How to tell what transmmison i hav in a 89 f250 with a diesel it is an auto



  • In 1989, Ford went from the C6 transmission to the E4OD. The C6 is a vacuum shift and the E4OD is an electronic shift, 1-2-3-OD.


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

Oct 13, 2011 | 1988 Ford F 250

1 Answer

HAVE A 1989 FORD F-150 WITH AUTO TRANS THAT YOU CAN'T SHIFT OUT OF THE "PARK" POSITION AT THE STEERING COLUMN. THE TRANY CAN BE SHIFTED AT THE TRANS WHEN LINKAGE IS DICONNECTED.I THINK THE...


What trans? AOD? This is 1992 F Series, all I have.

Shift Controls, Automatic Transmission The transmission shift control linkage or cable transfers the transmission operating mode from the selector lever to the transmission. The indicated transmission position on the steering column is transferred to a shift lever on the bottom of the steering column. On vehicles equipped with cable-operated shift systems, the indicated position of the transmission selector lever is transferred to the transmission through the shift cane, then to the cable, and down to the transmission manual shift lever at the transmission. On vehicles equipped with shift rod assemblies, the rod transfers the indicated transmission selector level position through a bell crank assembly to a control rod. The control rod transfers the indicated position to the transmission assembly.
----------------------------------------------
Automatic Transmission Manual Linkage Adjustments
  1. With the engine stopped and the parking brake applied, place the transmission selector lever at the steering column in the D (DRIVE position) for C6 applications and in the (D) (OVERDRIVE position) for AOD and E4OD applications, and hold against the D or (D) stop by applying a three-pound force to the selector lever knob.
  1. Loosen the shift rod adjusting nut at point A. Refer to the following illustrations.
  1. Shift the manual lever at the transmission into the (D) (overdrive) position for E4OD, by moving the lever all the way rearward, then forward two detents.
  1. With the selector lever and transmission manual lever in the(D) position, tighten the nut at point A to 17-24 Nm (12-18 ft-lb) torque. Use care to prevent motion between the stud and rod.
  1. Remove the three-pound force from the steering column selector lever knob.
  1. Operate the shift lever in all positions to make certain that the manual lever at the transmission is in full detent in all gear ranges. Re-adjust the linkage if required.
  1. On F-Super Duty Chassis Cab and Motorhome and Commercial Chassis recheck for correct operation of the automatic transmission selector indicator (PRN(D)21). Refer to Section 11-04A, Steering Column, Shift Rod Within Tube. ani_caut.gif CAUTION: Under no circumstances will it be permissible to adjust linkage in any position other than the(D) position for E4OD applications.
---------------------
Automatic Transmission Shift Cable Adjustment
  1. From inside the vehicle, place the column shift select lever in the DRIVE position (C6) of the OVERDRIVE (AOD and E4OD). Hang a three-pound weight on the selector lever.
  1. Raise vehicle on a hoist.
  1. Remove the shift cable from the transmission lever ball stud.
  1. Pull down the lock tab on the shift cable body.
  1. Position the transmission shift lever in the DRIVE position (C6) or the OVERDRIVE position (AOD and E4OD). This is three detents from the front-most lever position with the first position counting as one.
  1. Connect the cable end fitting to the transmission lever ball stud.
  1. Push up on the lock tab to lock the cable in the correctly adjusted position.
  1. Lower vehicle down from hoist and remove the three-pound weight from the column shift select lever.
  1. After making the adjustment, check for park engagement. Check the transmission control lever in all detent positions with the engine running to make sure correct detent/transmission actions. Readjust if necessary.

Jun 21, 2011 | Ford F-150 Cars & Trucks

2 Answers

1988 ford F-250 i have to accelerate hard to make it shift into 3rd gear but as soon as I let off gasd it goes back to 2nd.i changed fluid and filter.wondering if it is modulator valve.


Ford C6
Verify there is vacuum to modulator, the rubber line tends to break/falloff
Verify the kick-down cable is correct
Verify the linkage is correctly adjusted.
A C6 reads engine vacuum and throttle position to automatically shift

Oct 14, 2009 | 1988 Ford F 250

1 Answer

Have c6 trans locks good in 1st and 2nd wont shift into 3rd


Tighten the band adjustment to 18 inch pounds it is a stud with a locking nut on the side of the transmission it is the one located toward the rear of the transmission not the one towards the front that is the 1st/reverse band adjust replace the modulator if problem persists sometimes they stick

Sep 04, 2009 | Ford F-250 Cars & Trucks

1 Answer

Will a ford c6 tranny bolt on to a 1995 ford 5.0l or 5.8l motor?


From 1990-1996 The C6 was replaced by the E4OD which was modified to include a fourth forward speed and electronic shift controls, replacing the hydraulic control mechanism of the C6.

The C6 works fine in your bronco.. Your friend will need a different transfer case!. i dont have the manual but this is my best guess. FOrd likes to make cars that have interchangeable parts. Like a 1999focus can interchange with 2007. as long as the liter and engine size are the same. In some cases. you will have to use different transfercase.

So you might be better off with a c6 transfer case or c4 for your friend.

Hope this helps

Feb 16, 2009 | 1995 Ford Bronco

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