Auto gearbox- looking for info

[SpeedySub]

Hi all

I have a 1998 BH 2.5 N/A 250T wagon.

My question it is supposed to be a 4 speed (4EAT). But it seems that mine has 5 gears! Now I could be counting wrong (counting the times the rev needle drops/feel of gear change). Could it be that the 4EAT has an over drive? 4 speed + overdrive? or I am thinking that it could have had a gearbox change at some point? My last car was a 3 speed + overdrive, what they called 4 speed.

I am confused as it appears to me that it has 5 gears. It appears to go into "5th" at about 3000rpm at about 100kph (drops to about 25000rpm at 100kph)

The code on the gearbox is TZ1A4ZKAAA-WC. I have looked on the web for info but cannot find anything useful.

Any help would be great. Mainly just for my information more than anything.

P.S all the gearbox info I could find was for the manual transmissions.

Edited September 29, 2014 by SpeedySub

[SpeedySub]

Ok, I have found this. It gives me a little more info but not quite what I was wanting i.e how many gears.

This gives some model info and gearbox info

https://www.drive.net/l/1980141/

T= Transmission, Z= four-wheel drive, automatic transmission, 1A= Automatic transmission, 4=??? ( maybe the number of gears?) Z=four-wheel drive without a center differential, rear wheel connecting hydraulic clutch (Active AWD), K= 2.5 DOHC (atmospheric), AAA= version type????? (maybe first version of gearbox)

[Marky]

Most autos do this, overdrive lockup or whatever it's called

if you flick it into tiptronic (if it has it?) or just put your foot down enough to unlock it you'll see what the story is. When it's unlocked the trans still has a bit of slip/slushyness, when it locks up (5th / overdrive) the rpm stays solid with pedal position. It's not a 5th gear, it's just sort of bypassing the torque converter to get that last little bit of efficiency when cruising

A lot of cars have an overdrive on/off switch for whatever reason to disable this if so desired

Edited September 29, 2014 by Marky

[SpeedySub]

Sweet thanks for the info. That helps, as I couldn't find much info on them. And no I don't have tiptronic (would have liked it though).

Last car was a Mondeo with a 3 speed with overdrive that could be switched on or off, that was a real piece of automatic s**t, it ended up losing 2nd and 4th(OD). I went to get a price for a rebuild and they advised it would be probably a minimum of $4000 to fix, not including taking engine and gearbox out (only way to get it out!) and didn't want to put a second hand one it as not sure of qaulity and still needed to get engine out (about a 4 - 6 hour job if everything went right.

So the Subaru is so much much better in that respect.