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new to me Bronco with transmission issues

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When I bought this Bronco the seller told me the transmission has a issue, he wasnt sure if it is toast or just needs "something".  The truck moves forward and reverse, drove onto the trailer when I picked it up. Drives around my yard. Last night I decided I was going to take it down to my local gas station and put some fresh gas in it. It started out fine , then it started to act up. It takes off in first ok, then when its time to shift into 2nd ,it just kicks into neutral, there is no 2nd there, if I let off the throttle , it will shift into 2nd, and if I'm real easy on the gas pedal , it will continue on. If i step on the gas pedal I lose  2nd again.  I thought it would have the  E4OD in it because its a 1989, but it doesnt. I was just under looking at the trans and its a square pan , 14 bolt, so it has to be a AOD or AODE trans. This truck has had a lot of money put into it at some time in its life. A lot of things have  been changed , the motor is painted orange (had to of been out) , it has headers on it with duals all the way back , the 3in lift, had all K&N  filters(gone), starter looks new, HAD a huge stereo system at one time,  Looks as though it had a visor  on it.   Somebody really cared for this thing at one time , then it got parked. Maybe the dude died who owned it...seen that before. Anyways I think the trans has been changed or maybe it came with it , I'll  wait for one of you guys to tell me what was in the 89's.  Any idea on the tranny issue would be appreciated.

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Yo T,

AOD is correct!


Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19
Post Code(s) here according to:

A helper can assist you by counting the codes. Some use their smart phones to record them.
Or ask local mom and dad parts stores if they will test it for you. The majority of parts chain stores tests just OBDII vehicles now.
Or purchase a coder reader such as;
"Innova ODB-1 and we generally recommend getting the extension cord with it, so you can work the ignition key in the cab while watching/holding the reader. It will save the codes but knowing when to go through the cycles and ensuring you get it right the first time can save time and hassle, especially if you're working on it by yourself, as most of us do." by BikerPepe`

Following should be verified at a trusted transmission shop or Ford dealership Service department, especially the throttle valve cable adjustment!

Mis-adjustment can wreck the transmission internals!!!

following in bold for some unknown reason`

My AOD works fine in Park, Reverse, and Neutral, and will move forward in OD, D, and Low, but is always in first gear, what could cause this?

There are a few common causes for this. The first is a disconnected or missing TV linkage. If the TV linkage is disconnected the transmission should default to full TV pressure which will make the transmission shift as if it were at Wide Open Throttle all the time. It is also possible that the TV valve in the valve body is stuck in the high pressure position. The easiest way to see if this is the case is to perform a TV pressure test as shown on our TV Linkage Adjustment Page.

@  https://www.becontrols.com/tvlinkage.shtml

 If you are using a valve body with some mileage on it there may be enough of a ridge from the original range of travel to cause the TV valve to get stuck when it travels past the ridge.

You could also have a stuck governor, or a stuck 1-2 shift valve. If the governor is sticking it will cause a delayed, or no upshift, depending on how bad the condition causing the sticking is. If the 1-2 shift valve is stuck, and will not stroke, the transmission will not shift out of first gear."

byBaumann Electronic Controls, LLC



by Jasper Engines & Transmissions 


See attached AOD INFO.

1989 Bronco Brochure @ http://www.lov2xlr8.no/brochures/ford/89bronco.html

And 1989 Bronco Electrical and Vacuum Troubleshooting Manual (EVTM), Shop Manual, Emission Manual, etc by mrnewland1


Download it in case it is deleted from the internet.








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