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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Ford AOD 4-2 Downshift

 
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Old 09-06-2016, 03:04 PM
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Ford AOD 4-2 Downshift

When I am driving my truck at 50 MPH and above in OD (Overdrive), my AOD transmission will only downshift once to 3rd gear and accelerate from there under wide open throttle. Is this normal?

It would be a lot more fun if the AOD would would downshift to 2nd gear at that speed.

And before someone gives the standard response of "TV cable," I have it set at full throttle = full TV pressure. The up shifts are right on time and firm, and downshift is quick. It just doesn't do a 4-2 downshift at speeds higher than about 45 MPH.
 
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Old 09-06-2016, 05:51 PM
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I'm pretty sure mine acts the same way. Let me check it tomorrow if I remember. Mine is an 84/302/AOD.
 
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Old 09-06-2016, 07:35 PM
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Originally Posted by maytag906 View Post
I'm pretty sure mine acts the same way. Let me check it tomorrow if I remember. Mine is an 84/302/AOD.
Thanks, Maytag. That would be great.

Mine *will* downshift from 4-2 from about 45 MPH (or lower). I would just like to make sure there isn't a problem.
 
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Old 09-06-2016, 09:02 PM
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My 86 does the same thing.

I tried adjusting the TV cable years ago to change that and it made shifting at other throttle positions too harsh or too late it seemed. Also heard that it can damage the transmission if it is adjusted too far one way or another.

Try shifting the lever into "1" and that may get it to downshift better for you. It won't hit first gear at those speeds, just the lowest gear it can reasonably grab.
 
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Old 09-07-2016, 01:21 AM
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Originally Posted by LARIAT 85 View Post
Thanks, Maytag. That would be great.

Mine *will* downshift from 4-2 from about 45 MPH (or lower). I would just like to make sure there isn't a problem.
I don't think you have a transmission problem; it's just the governor doing it's job.

Did you ever change your rear axle gearing?
 
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Old 09-07-2016, 11:57 AM
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Originally Posted by Ken Blythen
Did you ever change your rear axle gearing?
No, not yet. Still working on finishing up this restoration. But changing the rear gears will happen in the near future. When that happens, the downshift to third shouldn't be a problem.

Originally Posted by rlester
Try shifting the lever into "1" and that may get it to downshift better for you. It won't hit first gear at those speeds, just the lowest gear it can reasonably grab.
Thanks for the tip! I wonder if this what Ford meant when they explained "Forced Downshifts?"


From the 1985 F-Series Owner's Guide under Automatic Overdrive:

"FORCED DOWNSHIFTS - To gain extra acceleration, in (D) (OVERDRIVE) or D (OVERDRIVE LOCK-OUT), as in passing, push the accelerator to the floor. The transmission will downshift to second gear at speeds from approximately 55 mph to 25 mph. At lower speeds the transmission will downshift to first gear in either position. At speeds above approximately 55 mph, the transmission will downshift from overdrive to third gear."


If so, they completely forgot to tell you that you must first pull the gear selector down to "1." If not, they were about 10 MPH off for the downshift to second gear.
 
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Old 09-07-2016, 04:30 PM
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This morning, I found mine will shift into OD between 45-50 MPH, closer to 50. At 65MPH, I floored it, and it shifted into 3rd I believe, until I let up on it. Then back into OD. But I had quite a bit of weight in the back this morning.


Do you really want to go into 2nd at 50+ MPH? Seems the engine would really be racing. Mine has the 3:50 or so ratio out back, if it matters.
 
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Old 09-07-2016, 07:44 PM
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Originally Posted by maytag906
This morning, I found mine will shift into OD between 45-50 MPH, closer to 50. At 65MPH, I floored it, and it shifted into 3rd I believe, until I let up on it. Then back into OD.
Mine shifts into OD between 45-50 MPH as well.

But what happens when you floor it at 55 MPH? Does it downshift to 3rd, or 2nd? (the Owner's Manual states that it *should* downshift to 2nd at 55 MPH under WOT, but mine only downshifts to 3rd.)


Originally Posted by maytag906
Do you really want to go into 2nd at 50+ MPH? Seems the engine would really be racing. Mine has the 3:50 or so ratio out back, if it matters.
I also have the 3.55 rear gear.

Take an F150 with a C4 or C6 3-speed automatic. When you drive one of these at 55 MPH, does the vehicle simply accelerate in 3rd at WOT? Or does it kickdown to 2nd for more passing power?
 
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Old 09-08-2016, 02:03 PM
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That's true, let me try again tomorrow. Nothing being hauled.
 
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Old 09-09-2016, 02:07 PM
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well alllrrrriiigggghhhhtttyyy then...........


Here is what I observed today, your results may vary.


At 55MPH, the tach shows 1500 RPM. Floor it, the transmission shifts, and the tach jumps to 2500 RPM. But at the same 55MPH, if I shift it manually from OD, to D, the transmission shifts, but the tach says about 2200 RPM.


What do you make of that?
 
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Old 09-09-2016, 03:18 PM
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BUT (you'll have to go back outside again )......if you floor it at 55mph in Drive, does it also drop down another gear & jump to 2500 rpm?
 
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Old 09-09-2016, 03:29 PM
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Originally Posted by maytag906 View Post
well alllrrrriiigggghhhhtttyyy then...........


Here is what I observed today, your results may vary.


At 55MPH, the tach shows 1500 RPM. Floor it, the transmission shifts, and the tach jumps to 2500 RPM. But at the same 55MPH, if I shift it manually from OD, to D, the transmission shifts, but the tach says about 2200 RPM.


What do you make of that?
Like yours, my tach also shows a cool 1500 RPM at 55 MPH. It sounds like when you floor it at 55 MPH, the AOD drops out of overdrive to third gear - same as mine. 2500 RPM isn't really a lot of PUNCH for a nice passing gear. That is why I thought the transmission *should* drop to second. The highest speed I can get my truck to make a 4-2 downshift (or 3-2 downshift) is about 47 MPH. Anything higher than that, and it only drops to third (or stays in third). I guess the Owner's manual is incorrect. Thanks for verifying my suspicion - positive reps sent to you.

When you shift out of OD to D, you are manually pulling the AOD out of overdrive and into 3rd. Shouldn't the RPM be the same if you simply floored the throttle at the same speed and the AOD dropped to third automatically? That IS strange.

I will check that out on mine as well.


Originally Posted by Ken Blythen View Post
BUT (you'll have to go back outside again )......if you floor it at 55mph in Drive, does it also drop down another gear & jump to 2500 rpm?
My AOD does not. If I floor it at 55 MPH in Drive, it simply accelerates without a kickdown.
 
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Old 09-09-2016, 07:02 PM
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Originally Posted by Ken Blythen View Post
BUT (you'll have to go back outside again )......if you floor it at 55mph in Drive, does it also drop down another gear & jump to 2500 rpm?


Now I'm curious, I'll try it tomorrow.
 
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Old 09-12-2016, 06:19 PM
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Ya know what, you're right!


At 55MPH, in D, you floor it, the truck accelerates, but the trans doesn't shift, stays in D.
 
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Old 09-13-2016, 02:48 PM
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Originally Posted by maytag906
Ya know what, you're right!


At 55MPH, in D, you floor it, the truck accelerates, but the trans doesn't shift, stays in D.
Thanks, Chief. Now I know for sure my transmission is performing normally.
 

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