Do U4P0 cars have 3.27 gears?

Stanger007 · Sep 18, 2007

Hey guys, tuning a car this weekend and need to do some speedo correction - can anyone verify that the U4P0-based automatics have 3.27s from the factory?

Thanks,
Wes

Mustangless · Sep 18, 2007

I have a u4p0 and it has 3.27s, according to my door code

95BlackTan50 · Sep 18, 2007

Some of the transmission scalars of the U4P0 are scaled by 3.27/2.73 when compared to the W4H0, which has 2.73 gears. This also implies that the U4P0 has 3.27 gears as stated by Mustangless.

Stanger007 · Sep 18, 2007

Sounds good to me, thanks for verifying that for me guys!

Wes

HISSIN50 · Sep 18, 2007

As I recall, the 3.27's were simply an option for any AODE 94-95 (as they were for Fox III AOD's).
Eddie once posted his window sticker showing them as like a 50 dollar option IIRC.

Mine (W4) came with 2.73's per the door and pumpkin tags.

toyman · Sep 18, 2007

Mine came with the 3:27 option. They're for sale if anyone is interested.

Juggalo95 · Sep 19, 2007

Sorry but could someone tell me what a U4P0 car is? My cars is a 95gts with aode and I beleiev from my rear end tag it has 3.27...but didnt all aode cars have 3.27 rears?

toyman · Sep 19, 2007

Juggalo95 said:
Sorry but could someone tell me what a U4P0 car is? My cars is a 95gts with aode and I beleiev from my rear end tag it has 3.27...but didnt all aode cars have 3.27 rears?

It's the PCM (computer) identifier. U4P0 94-95 5.0L GT Auto. T4M0 94-95 5.0L GT Vert 5-spd. W4H0 94-95 5.0L GT. J4J1 94-95 5.0L SVTCobra. ZA0 95 Cobra R.
The 3.27 was a performance option on the AOD-E GT.

Bosko5.0 · Sep 19, 2007

Yeah I HAd a U4P0 with 3.27 but Then bent the housing. Now I have U4P0 with 3.55

HISSIN50 · Sep 19, 2007

Just in case it wasn't super clear in Toyman's post (I'm not reading too well tonight), the W4 puter was the other AODE puter.

Juggalo, as always, be sure to physically check your gear if contemplating a switch. We don't get new pumpkin or door tags with gear sets.

final5-0 · Sep 19, 2007

I can say I got a 95 GT with t-5 trans and it has a t4m0 pcm
and
I've talked to other 94-95 GT t-5 Stang owners with the same pcm

I've seen it said Vert's with t-5's had the same pcm as well

I'd go along with the W & U pcm's being for autos
and
The J & Z pcm's being for Cobra's

O Yea ... PCM = Powertrain Control Module

Now ... why and what is the difference between the two auto pcm's

I got no clue
as
All my experience has been focused on t4m0 & j4j1

Grady

Stanger007 · Sep 19, 2007

Below is not a complete list, but a fairly complex one. BinaryEditor does not have nearly all the transmission scalars that the latest CBAZA definition from Mike Glover has, but this will give you an idea.

Like 95BlackTan50 said, the changes are made because the differences in gearing although they don't seem to be exactly the ratio of 2.73/3.27 but you get the idea of what they are trying to accomplish.

Differences in W4H0 (Auto/2.73) & U4P0 (Auto/3.27) in Binary Editor CBAZA v20:

Scalars: W4H0/U4P0
RPM - Rev Limit #1 On: 5700/5800
RPM - Rev Limit #2 On: 5450/5550
Trans - 2-1 Pullin Max Speed: 36/30
Trans - 3-2 Pullin Max Speed: 88/75
Trans - Base RPM/VSS: 37/45
Trans - Min Tm In 3 Before34 L4: 2048/2560
Trans - Mnossper: 644/535
Trans - Wot 1-2 Shift Point: 4630/4400
Trans - Wot 2-3 Shift Point: 4870/4900

Functions:
Idle - Dashpot maximum clip vs Vehicle Sped (MPH)
Idle - Dashpot Pre-Position
Quite a few "Misc" functions - mostly tranny related
System - X Normalizer Trans pressure 16
System - Y Normalizer Trans pressure 16
Trans - 1-2 Shift Speed vs TP
Trans - 2-1 Shift Speed vs TP
Trans - 2-3 Shift Speed vs TP
Trans - 3-2 Shift Speed vs TP
Trans - 3-4 Shift Speed vs TP
Trans - 4-3 Shift Speed vs TP
Trans - Converter unlock 2nd
Trans - Converter unlock 3rd
Trans - Converter unlock 4th
Trans - Dynamic 1-2 TV Pressure vs TP
Trans - Dynamic 2-1 TV Pressure vs TP
Trans - Dynamic 2-3 TV Pressure vs TP
Trans - Dynamic 3-2 TV Pressure vs TP
Trans - Gear Lockup vs TP Fourth
Trans - Gear Lockup vs TP Second
Trans - Gear Lockup vs TP Third

Tables:
Trans - Converter Slip 2nd
Trans - Converter Slip 3rd
Trans - TV Pressure 34
Trans - TV Pressure 43

Do U4P0 cars have 3.27 gears?

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