AOD woes
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Cargo Master
Joined: Jan 2005
Posts: 2,497
Likes: 5
From: Tucson AZ
AOD woes
I have not been around much lately, as some of you know BADAZ56 burned a couple of months back and repairs have been 99% completed. I am ready for a road trip. Unrelated to the freak accident that caused the fire my rebuilt AOD does not downshift when the throttle is floored, it stays in OD and lugs the engine, sort of like driving a manual trans in too high a gear. Is there a way to disengage the OD function and drive it in 3rd gear instead? There are unused connector pins on the neutral safety switch, might their function be an "overdrive off" setting? Some of my other Ford trucks recommended using Od OFF when towing or driving in the mountains. I need some answers before my scheduled up to the mountains road trip next Saturday. Thanks in advance
Logistics Pro
Joined: May 2010
Posts: 3,793
Likes: 19
From: Austin
Hey Tim,
Not sure what shifter you are using... Our 351W/AOD is a column shift - prndo. Running in Drive never engages the Overdrive - you won't get much past 60 in 3rd gear though...
I'm sure you knew that already but I thought I'd throw it out there.
We had to tweak that damn AOD cable a lot to get it to shift correctly - very minute changes. Do you have a pressure gauge?
Ben in Austin
(San Francisco this week).
Not sure what shifter you are using... Our 351W/AOD is a column shift - prndo. Running in Drive never engages the Overdrive - you won't get much past 60 in 3rd gear though...
I'm sure you knew that already but I thought I'd throw it out there.
We had to tweak that damn AOD cable a lot to get it to shift correctly - very minute changes. Do you have a pressure gauge?
Ben in Austin
(San Francisco this week).
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Cargo Master
Joined: Jan 2005
Posts: 2,497
Likes: 5
From: Tucson AZ
Thank you both for posting on this. I scratch built the shifter (see my Dash Panel gallery, pics 2,3 & 5) and it was made with a C4 shift pattern with only PRND. I have never changed it for the AOD PRNOD. I disassembled the shifter late last night and modified the detents. I will be road testing it this morning if it doesn't rain. Sometimes it's hard to see the forest because the trees are in the way. I will be reposting on this ASAP Thanks again
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Cargo Master
Joined: Jan 2005
Posts: 2,497
Likes: 5
From: Tucson AZ
Just returned from a 20 mile road trip and it appears that modifying the shifter with an additional detent for the non-overdrive position seems to work. It needs a little tuning up but it is sitting the garage right now to cool off so I can get under it. I will post the total of my recently acquired knowledge for all to see once I am done. I just might make my Saturday road trip yet!
Logistics Pro
Joined: May 2010
Posts: 3,793
Likes: 19
From: Austin
Hey Tim,
Just for peace of mind - check the pressure of your AOD. Just a cheap harbor freight pressure gauge is all you need.
(I say this because we blew one AOD - it's an expensive mistake). I can't recall the pressure tolerances but I'm sure
someone on here has them.
Ben in Austin
1950 F1
Just for peace of mind - check the pressure of your AOD. Just a cheap harbor freight pressure gauge is all you need.
(I say this because we blew one AOD - it's an expensive mistake). I can't recall the pressure tolerances but I'm sure
someone on here has them.
Ben in Austin
1950 F1
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Cargo Master
Joined: Jan 2005
Posts: 2,497
Likes: 5
From: Tucson AZ
Everything is right in spec, pressures included. I did indeed re-cut the detent for the non-OD position and when I got under the truck to check it out the lever for the TV cable was touching the gear selector lever. I added some shims and bent of the arms a little and now it goes solidly into non-od and there is no clearance issue. I haven't driven it yet as I have a couple of little things to do while it's up in the air but tomorrow looks good. Thanks again for your ideas and your input, you guys are the reason that I have been on this site for the last 10 years. Hoist a cold one with my compliments.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
Never heard this before. I have an Edelbock carb and lokar cable. I was unaware of the need for lever ratio like on a GM od. Mine has worked great since connecting it several years ago. How do you figure the ratio needed? I wonder if fatfenders56 has a governor sticking?
Fleet Owner
Joined: Jul 2004
Posts: 27,299
Likes: 1,059
From: NM
I would guess that most aftermarket carbs have holes in the right places to attach linkage or cables to common trans's. The installation sheet for the carb should tell you which one. I can't remember for certain but I think the AOD uses line pressure modulated by the throttle valve to determine when to shift up/kick down.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,622
Likes: 3
From: okla
I was unaware that aftermarket carbs have any linkage that pertains to what trans you are using. Maybe what throttle linkage you might be using. I don't ever recall seeing any info regarding trans in their instructions. I don't believe the AOD needs the special "arc" a GM trans does. Of course my wife reminds me often that I am wrong.
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