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Yesterday, I got to go for a long ride in a 2001 M-GT conv. It's an auto (my girlfriend's mom's car) and although we didn't fool with it much, it did chirp 1-2 shift when manually shifting... I thought this was only supposed to happen if the car is chipped or has a shift-kit in it... My T-Bird used to chirp 1-2 when the accumulator springs were broken (even in D) but it hadn't ever again until I got the chip.

Why does this car chirp 1-2 in stock trim? Was it because the car doesn't reach redline in drive but it does if manually shifting?

I know both the AODE and the 4R are electronically controlled, but is line pressure controllable on the AODE? Is it more similar to the AOD or the 4R70W?

PJ
 

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Oh boy...

Greenbird,

Hey let's break down your misinformed post down and put up some facts.


You said...
"here is what i got from it:
AOD = pushrod motors, hydralic control
AODE = pushrod motors, electric control
4r***= modular motors, electric control"

Perhaps less rush next time and more reading.

'92-'94 Crown Vic and Grand Marquis had a 4.6L with an AOD-E. Clearly modular.
'92-'94 Town Car another modular engine with an AOD-E.

Even the early Crown Vic change over in '91 went to a 4.6L modular engine with an AOD. Yes, an AOD. Dubbed the "Bastard block" by some.

PJ,

All '94-'95 Mustangs used an AOD-E unless they were manual transmissions. That was with the 3.8L or 5.0L engine. Starting in 1996, they switched to the 4R70W and are still using it today on the '03 Mustang GT and V-6. Even the '03 MACh 1 auto carries a 4R70W.

ALL (I repeat), all PRODUCTION MN12's (either 3.8L or 4.6L) with the model year 1994 through 1997 used a 4R70W. Never was an AOD-E used on any production MN12. From 1989-1993, the MN12 used an AOD for an auto. The AOD is FULLY hydraulic with no electrical controls. The AOD-E and 4R70W are also hydraulic, but are electronically controlled.

The difference between the AOD-E and 4R70W is WELL documented in the man's thesis right here on this site. It's not just the gear ratios, but that is the major part of it.

A-Train
 

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The main reason that the Stang chirpped is because it is lighter, more powerful, and has more torque than a 4.6 Bird. It has really nothing to do with the type of tranny (because, as you can see, they are all the same trannies, and not all of the chirp).

Pat
 

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Not 100% true...

Pat,

Those Mustangs carry a new main control that has larger feed orifices to the clutches, most of what the man has you do in his thesis. The EEC also has increased line pressure during the shifts when compared to a mom and pop CV or our MN12's.

So it is possible to get a few chirps every now and then. Also the Mustang has a live axle making power to the wheels more efficently. Our IRS soakes up power, believe it or not.

A-Train
 

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Gotcha.

But, doesn't a live axle hop more than a IRS? I'm just talking about traction-wise from a hard start, don't we have the advantage (and i'm not just talking 'bout our weight)?

Pat
 
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