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Old 02-23-2014, 06:19   #1 (permalink)
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91 t-bird lx 5.0 HO AOD transmission question

I just bought my car and it has 113xxx miles I wanted to change the oil and transmission fluid and filter,

Dropped the trans pan lastnight accidently disconnected the modular valve but reconnected that after pan was back on, the filter looked bad, but there was no sight of wear in the fluid, so replaced the filter with the o rings where they are supposed to be, and bolted it back up, put pan back on, and filled with fluid, and reconnected the modulator valve now it won't shift into 2nd or 3rd or 4th nothing stays in first I believe, the car will bog down if I put it in drive to 1st though so it must be in 2nd constantly.

1. How many quarts of fluid was I supposed to put in? Parts guy said 3.5 quarts. That seemed low.

2. Any ideas as to why it won't shift?

3. Is there a torque spec that I needed to know of for pan or filter replacement.

4. Do I need to reset the modular valve somehow?

Any ideas would be helpful this is my only vehicle that's running and I need to figure this out soon! Any help is appreciated thanks, and please don't tell me I need to search because I have, maybe not the right keywords but this is kindof specific. Thanks
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Old 02-23-2014, 07:24   #2 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

I've gotten various numbers for the AOD, but they're all above 3.5 quarts. Most common was 6-6.5 for the sump and another 5 for the converter. Did you check the dipstick?
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Old 02-23-2014, 07:36   #3 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

Yea I looked it up as well but nothing specific for the thunderbird it's all about f150 and so on, dip stick showed after I was running for a little bit aside from fluid any other reason?
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Old 02-23-2014, 08:03   #4 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

I've got a Haynes manual and I still can't figure it out Im missing something
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Old 02-23-2014, 18:59   #5 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

Please explain "dip stick showed after I was running for a little bit". You should have been high on the dipstick initially, then settling into the operating band once running.
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Old 02-24-2014, 03:59   #6 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

As for fluid it didn't initially show any fluid on the dipstick, but when the car sat for a half hour it showed up, showed full when cold and when I warmed the car up it showed full. I was saying its not a fluid lvl problem.
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Old 02-24-2014, 17:49   #7 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

3.5 qts seems awfully low, but I keep getting mixed results on transmission compatibility between T-birds and Cougars and the rest of the Ford line up. Since the level seems to be where it supposed to be, I would re-look at the modulator. A filter change and refill shouldn't affect the operation of the tranny.
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Old 02-24-2014, 20:37   #8 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

The AOD uses a throttle valve not a vacuum modulated. It is cable operated and connects at throttle body(if it's old enough) or it is computer controlled. Look for a cable that runs to the Trans from the throttle body. Should be a grommet connecting the cable. Have seen those dry and fall off. Can cause real early up shifts or make it seem as tho it's stuck in gear.


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Old 02-28-2014, 21:28   #9 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

update, the problem is fixed, i found the problem the tv cable was in fact sticking, seems strange i never touched it, the pan must have bumped it when taking it off or something but i readjusted the cable and all is well now!
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Old 03-01-2014, 05:15   #10 (permalink)
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Re: 91 t-bird lx 5.0 HO AOD transmission question

Good to hear and thanks for the feedback.
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