Ford AOD 4-2 Downshift
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Cargo Master
Joined: Dec 2004
Posts: 3,362
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From: Florence, SC
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.
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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Cargo Master
Joined: Dec 2004
Posts: 3,362
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From: Florence, SC
Mine *will* downshift from 4-2 from about 45 MPH (or lower). I would just like to make sure there isn't a problem.
Mountain Pass
Joined: Nov 2003
Posts: 137
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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.
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.
Cargo Master
Joined: Aug 2007
Posts: 2,560
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From: New Zealand
Did you ever change your rear axle gearing?
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Cargo Master
Joined: Dec 2004
Posts: 3,362
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From: Florence, SC
Originally Posted by Ken Blythen
Did you ever change your rear axle gearing?
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.
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.
Posting Guru
Joined: Sep 2011
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From: Northern Indiana USA
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.
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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Cargo Master
Joined: Dec 2004
Posts: 3,362
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From: Florence, SC
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.
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.
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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Posting Guru
Joined: Sep 2011
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From: Northern Indiana USA
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?
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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Cargo Master
Joined: Dec 2004
Posts: 3,362
Likes: 22
From: Florence, SC
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?
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?
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.
Posting Guru
Joined: Sep 2011
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From: Northern Indiana USA
Now I'm curious, I'll try it tomorrow.
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Cargo Master
Joined: Dec 2004
Posts: 3,362
Likes: 22
From: Florence, SC
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.
At 55MPH, in D, you floor it, the truck accelerates, but the trans doesn't shift, stays in D.
