AOD OD shift point
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
Shoot, mine will shift into overdrive at 39 mph under light throttle.
The tail shaft governor and TV pressure determine when it shifts, RPM and speed are not directly responsible.
So it matters what your rear gear ratio is, how tall your tires are, and how far you're depressing the gas pedal.
The tail shaft governor and TV pressure determine when it shifts, RPM and speed are not directly responsible.
So it matters what your rear gear ratio is, how tall your tires are, and how far you're depressing the gas pedal.
1st Gear
Joined: Jan 2025
Posts: 1
Likes: 0
Shift points are determined by how much throttle you have. If you are driving slower, the shift points will come earlier. If you are driving faster, the shift points will come later and the AOD will shift quicker.
At moderate throttle, you should feel a positive shift from 1st to 2nd gear. 2nd to 3rd will always be a little bit softer, and 3rd to overdrive will be a little soft as well.
If you don't have a pressure gauge, here is a test you can do to see if your TV pressure is correct. Drive your vehicle so that RPMs stay at 1500 RPM, and observe your shift point speeds. If you have a 5.0/302 engine with 3.55 gears, this is where your AOD *should* shift:
1 - 2 = 15 MPH
2 - 3 = 25 MPH
3 - 4 = 45 MPH
If your AOD shifts earlier or later than that, you should adjust the TV rod until it matches the above shift points. If TV pressure is too low, the AOD will shift early with very soft, lazy shifts. This is bad for the transmission. If TV pressure is too high, the AOD will shift later and harsher and overdrive will either not come in all or you will have to let off the gas completely for it to engage. It will usually "clunk" into overdrive if the pressure is too high.
When you have the shift points correct, here is another test. Drive the truck normally, and as soon as you feel the AOD shift into 2nd gear, FLOOR the gas pedal. Your AOD *should* immediately downshift to first gear. Next, with the transmission in "D", floor the gas pedal when your truck reaches 45 MPH. Your AOD *should* immediately downshift to 2nd gear.
If your truck passes all of these tests, your TV rod (or TV cable) is adjusted correctly.
Capiche?
At moderate throttle, you should feel a positive shift from 1st to 2nd gear. 2nd to 3rd will always be a little bit softer, and 3rd to overdrive will be a little soft as well.
If you don't have a pressure gauge, here is a test you can do to see if your TV pressure is correct. Drive your vehicle so that RPMs stay at 1500 RPM, and observe your shift point speeds. If you have a 5.0/302 engine with 3.55 gears, this is where your AOD *should* shift:
1 - 2 = 15 MPH
2 - 3 = 25 MPH
3 - 4 = 45 MPH
If your AOD shifts earlier or later than that, you should adjust the TV rod until it matches the above shift points. If TV pressure is too low, the AOD will shift early with very soft, lazy shifts. This is bad for the transmission. If TV pressure is too high, the AOD will shift later and harsher and overdrive will either not come in all or you will have to let off the gas completely for it to engage. It will usually "clunk" into overdrive if the pressure is too high.
When you have the shift points correct, here is another test. Drive the truck normally, and as soon as you feel the AOD shift into 2nd gear, FLOOR the gas pedal. Your AOD *should* immediately downshift to first gear. Next, with the transmission in "D", floor the gas pedal when your truck reaches 45 MPH. Your AOD *should* immediately downshift to 2nd gear.
If your truck passes all of these tests, your TV rod (or TV cable) is adjusted correctly.
Capiche?
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
If TV pressure is too high, the AOD will shift later
That is what I copied from the post above. You'll need to figure out which way to adjust the cable to low the pressure. Sorry, I'm not sure which way.
But I'm sure if you ask google how too ..... You may find a video.
https://www.google.com/search?q=how+...hrome&ie=UTF-8
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