AOD won't shift out of first gear - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-20-2002, 09:00 AM
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Post AOD won't shift out of first gear

Recently istalled AOD into 70 mustang behind 351w. Will go into first gear and reverse but when you get going and let off the throttle instead of shifting up, goes into nuetraul. Does this in Drive and OverDrive. Have adjusted TV cable does not affect operation. Got transmission out of bone yard so do not know anything than it is out of 88 mustang. Any help on this would be greatly appriciated.


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Old 12-20-2002, 09:12 AM
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I've been through 2 AOD's in my Lincoln but right before they would die I would just have 2nd gear, then just 1st. Is your trans rebuilt? Also check the tv pressure should be between 30 and 35 psi. I think psi might be pounds per square foot or something but I know it's supposed to be in between 30 and 35 ps something. The people who rebuilt my trans said that if I ever do anything to the top half of my motor than I have to get the TV pressure checked again because it somehow effects the pressure.
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Old 12-31-2002, 02:51 PM
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The TV pressure should be set at "0 lbs" at idle with a warm engine. You hook up a pressure guage at a port on the pass. side of the tranny. A tranny shop can do this for you quite easily. Are you using a rod or Aftermarket cable set-up? Make sure the linkage has a good return spring so it comes back fully when the throttle's let off.
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Old 12-31-2002, 05:54 PM
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it sounds to me like the valve body is pluged up run some dw40 through it and let it soak and spary
it a little while before you put it back in hope it helps
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Old 12-31-2002, 06:20 PM
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When you are done checking the valve body out some times when a trans, sets for a wile the govener sticks, pull the cover off pull the govener out and make shore thats its free and working.there is a small like valve in the shaft of the govener make shore that it moves freely.
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Old 12-31-2002, 07:31 PM
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It could be the govenor.On an AOD you have to take off the tail housing to get it.A friend of mine had the same problem after he had it rebuilt.I went out and adjusted the pressure and it made no difference.He went and got another one and it worked.I got a good trans guy to look at it.He said if it would have shifted it would'nt have lasted .The first guy put it back together with a bad front pump etc.So we never did find out what the problem was.Let me know the outcome....Lash
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Old 01-01-2003, 07:43 AM
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If you take the tail housing off to check the governor..... You can use an air hose to check the shift valves.

Use a screw driver to unbolt the governor from it's mount or remove the snap ring and remove the entire unit from the drive shaft. There is a check ball there that aligns the governor to the shaft. This mount is directional!!! the holes only line up one direction. Mark the gov "back" so you re-install it correctly if you remove it.

One port(hole) of the governor feeds directly to the valve body. With the pan off you can slowly increase the pressure and the shift valves will move sequentially as they do when the tranny shifts during normal operation.

Watch for air leaks around the end plugs on the valve body bores. This is a problem area with AOD trannys.
Tony



[ January 01, 2003: Message edited by: Crosley ]</p>
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Old 03-16-2003, 12:13 PM
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Hey, I am having the same exact problem, a while back I changed my 302 v8 & AOD tranny with a 351 and a C4, I let the AOD set out on the ground covered up with a tarp for a few months, now i just changed the C4 in my truck with the AOD that had been sitting for a while, I have everything put together but it wont shift out of first, it will go in reverse, overdrive, drive , and 1st but i cant get it to shift out of 1st......the transmission worked fine when i took it out of the truck.....maybe its the gov.......oh well...never worked on a transmission before....guess its time to learn
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