Ugly duckling?
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Senior User
Joined: Feb 2008
Posts: 246
Likes: 0
From: Hochfeld, Manitoba
Originally Posted by preppypyro
Was that called a AOD? My reg cab shortbox has an AOD but I couldnt tell you what the shifter reads off of the top of my head.
The overdrive is pretty good, but in a brisk head-wind shifting to D causes the motor to rev higher than I would like.
I had never seen a tranny like this before I bought this truck.
Lead Driver
Joined: Aug 2002
Posts: 6,682
Likes: 12
From: Saskatoon SK Canada
You have an AOD which is a 4spd transmission. 4th is overdrive and 100% lockup. 3rd gear has 75% lockup.
Shift patterns:
(P-R-N-O-D-1) Truck/Crown Victoria/Town Car etc
(P-R-N-O-D-2) Mustang
Gear Ratios:
2.47 / 1.54 / 1.00 / 0.67
Shift patterns:
(P-R-N-O-D-1) Truck/Crown Victoria/Town Car etc
(P-R-N-O-D-2) Mustang
Gear Ratios:
2.47 / 1.54 / 1.00 / 0.67
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Lead Driver
Joined: Aug 2002
Posts: 6,682
Likes: 12
From: Saskatoon SK Canada
Not every transmission allows you to select every gear. You just can't force the transmission into 2nd gear.
O - Allows all 4 gears to be used
D - Allows up to 3rd gear
1 - 1st gear only
If you have a tach, you can tell when it shifts gears by watching the RPM's change.
Part of the reason you can't select every gear is Ford used the same steering column for all it's automatics. The C-4/6 transmissions only have 6 detents and to make the AOD compatible it can't select 1st or 2nd gear (depends on model). The other nice thing is you can put an AOD in an older car and retain the stock column yet have overdrive.
O - Allows all 4 gears to be used
D - Allows up to 3rd gear
1 - 1st gear only
If you have a tach, you can tell when it shifts gears by watching the RPM's change.
Part of the reason you can't select every gear is Ford used the same steering column for all it's automatics. The C-4/6 transmissions only have 6 detents and to make the AOD compatible it can't select 1st or 2nd gear (depends on model). The other nice thing is you can put an AOD in an older car and retain the stock column yet have overdrive.
Lead Driver
Joined: Aug 2002
Posts: 6,682
Likes: 12
From: Saskatoon SK Canada
All Ford's older automatics have the same 1.00:1 ratio in 3rd gear. Just with the AOD it has a partial lockup in 3rd gear so it will run at a slightly lower rpm. The C-4/6 transmissions will run approx 300 rpm higher than a manual transmission in direct gear and the AOD will run about in the middle of the two.
With the newer automatics the computer can command a lockup in any transmission gear by controlling the clutch. This is why the newer vehicles can get the same highway mileage as a manual transmission version.
The AOD doesn't have a typical lockup converter as one of the main input shafts is splined directly to the front of the torque converter where as the modern transmissions use a clutch lockup.
With the newer automatics the computer can command a lockup in any transmission gear by controlling the clutch. This is why the newer vehicles can get the same highway mileage as a manual transmission version.
The AOD doesn't have a typical lockup converter as one of the main input shafts is splined directly to the front of the torque converter where as the modern transmissions use a clutch lockup.