Transmission slips Dear Experts, My 1991 Ford F 150, 2wd automatic transmission (E40D) doesn't opertate properly after I changed the starter solenoid. It slips like the clutches are not working. Is this a coincident or did I blow a fuseable link? All the smaller wires are on the starter solenoid post with the battery cable. On the other side is the post that has the larger wire that goes to the starter itself. The truck starts and runs fine except for the transmission issue. The truck did sit for approx. eight months. Thanks for your help, Rich

Videos plus diagrams in the images tab.

https://www.google.com/search?q=1991+Ford+Bronco+starter+solenoid+wiring

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Try the 4R100
See the following article
https://www.usshift.com/e4od.shtml

Being a 91, take it back. But this really depends on who you had build it. Shade tree guy, your probably going to eat it. Garage, take it back and make them fix it.

this is the modulator this one is pre-adjusted for A4ld

this is the other one that is adjustable for the c-6 trans

E40D trans they are all different and maybe you'll find it now there is 4.9 motor 5.0 5.8 and all can come with A4ld /E40D / or C6 transmission look for broken or disconnected vacuum lines or if the engine is running rough you must correct the running condition because you are loosing vacuum inches and the trans needs vacuum at a certain level to shift if the engine stutters your loosing the vacuum and it will never shift that's what this sounds like to me or that modulator needs adjustment or to be replaced later man! it's party time!

Hi Rodney, Have the vehicle scanned and diagnosed. That way you will know for sure where the problem is. I believe the problem is in the control system. Regards John

For Automatic transmission problem,click the link below:---- Automatic transmission troubleshooting:----

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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AUTOMATIC TRANSMISSION FLUID LEVEL? --

http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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AUTOMATIC TRANSMISSION FLUID AND FILTER?

http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html

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http://schematicsdiagram.blogspot.com/2011/12/transmission-fault-light-on-car-dash.html

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http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html

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http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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http://technoanswers.blogspot.in/2012/02/dodge-neon-wont-go-in-reverse.html

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http://technoanswers.blogspot.in/2012/02/dodge-automatic-transmission-will-not.html

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http://technoanswers.blogspot.in/2012/02/transmission-is-making-buzzing-noise.html

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This will help.

Thanks.

it is the solenoid, and sounds like its working. check the starter

Sounds like the shift solenoids in valve body. Before you go nuts have it checked out by transmission shop. They have the proper tools to pressure check it and if necessary do a stall test.
AS LONG AS ITS NOT SLIPPING THEN THE REPAIR ISN'T SO STEEP. IF ITS SLIPPING THEN ITS THE CONVERTOR. (basically a rebuild job).

i would think you would be fine, just swap the computers for the trannsmission as well

Automatic trans??? 2 or 4 wheel drive??
AOD 2 wd- 12.3 qts
AOD 4 wd - 12.3 qts
C-6 2 wd - 12.0 qts
C-6 4 wd- 13.5 qts
E40D 2 wd 15.7 qts
E40D 4wd 16.2 qts
4R7OW - 14 qts