electronic shift upgrade for old aero
Former ******
Joined: Nov 2004
Posts: 4,901
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From: Salt Lake City, Utah
The early 5 speed designs had problems too, though they were electronic. I would just go for upgrading the existing A4LD to handle increased load if you even need it. If you are going for fuel economy, the real benefits come from 6 speed or better transmissions with multiple overdrive gears.
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
the later A4LD series from the late '80s on to the last in '95 are actually a hybrid auto tranny....part mechanical shift part electronic shift control
3<>4 aka OD and TC lockup are totally PCM controlled hydralically operated shifts
all others are mechanical based solely on vacuum modulator boost valve control of adjusting line pressure and the mechanical govenor located on output shaft measuring veh. speed
one of the main benefits of all electronically sensored and controlled shifting is there is no shift problems caused by ATF in temps below 40d F, delayed late shifts, hard engagements
3<>4 aka OD and TC lockup are totally PCM controlled hydralically operated shifts
all others are mechanical based solely on vacuum modulator boost valve control of adjusting line pressure and the mechanical govenor located on output shaft measuring veh. speed
one of the main benefits of all electronically sensored and controlled shifting is there is no shift problems caused by ATF in temps below 40d F, delayed late shifts, hard engagements
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Freshman User
Joined: Mar 2006
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Originally Posted by 96_4wdr
the later A4LD series from the late '80s on to the last in '95 are actually a hybrid auto tranny....part mechanical shift part electronic shift control
3<>4 aka OD and TC lockup are totally PCM controlled hydralically operated shifts
all others are mechanical based solely on vacuum modulator boost valve control of adjusting line pressure and the mechanical govenor located on output shaft measuring veh. speed
one of the main benefits of all electronically sensored and controlled shifting is there is no shift problems caused by ATF in temps below 40d F, delayed late shifts, hard engagements
3<>4 aka OD and TC lockup are totally PCM controlled hydralically operated shifts
all others are mechanical based solely on vacuum modulator boost valve control of adjusting line pressure and the mechanical govenor located on output shaft measuring veh. speed
one of the main benefits of all electronically sensored and controlled shifting is there is no shift problems caused by ATF in temps below 40d F, delayed late shifts, hard engagements
this raises a new question...... i am afrade evan if i can find a 1986-87 trans its gonna have over a million miles on it... after reading this post it got me thinking.... maybe the way to go would be to use my OLD Valve Body & output shaft and possibly the torque converter (if necessary) ....... ... is this possible???.... will my OLD A4LD Valve Body interchange and mate up with a newer A4LD with electronic shift???. . . . would it be possible to convert a electronic shift to a machanical hydraulic shift?? . ....when i orderd the A4LD Trans-Go-Shift-kit it didn`t specify the year... so i asume the Valve body bolt pattern is the same for all A4LDs...... they also offer a adjustable boost valve up to 50-PSI .. if my memory servs me right you need to drill and tap the tail-shaft to instal it....
Post Fiend
Joined: Oct 2005
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From: Kiev, Ukraine
Well, 86-87 aeros had valve bodies with 1 solenoid valve for TC-clucth, newer since '89 have 2 solenoids for TC clutch and OD. U can use 86-88 valve body with 86-88 tranny only, becouse fluid channels of the gear boxes are different, but U can easily use gears, clutch disks, bands, TCs, shaft and bearings ann all the trannyes from A4LD to 5R55E, but some trannies are made for different torque and may have different quantity of clutch disks, different TCs and different springs in valve body.
In your sitiation pay attention to manual M50D tranny. It fits aero well, just add clutch pedal unit with master cylinder and get a bit longer driveshaft. U will be surprised with fuel economy and how old aero can run fast, faster then 4.0 aero. Belive me, human braine is smarter old ford ECU.
P/s Use 1 bulb instead of solenoid elce CE light may periodically appeare.
In your sitiation pay attention to manual M50D tranny. It fits aero well, just add clutch pedal unit with master cylinder and get a bit longer driveshaft. U will be surprised with fuel economy and how old aero can run fast, faster then 4.0 aero. Belive me, human braine is smarter old ford ECU.
P/s Use 1 bulb instead of solenoid elce CE light may periodically appeare.
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