4EAT interchange / replacement / compatibility - '93 Impreza >> ?

[wtdash]

Hi,

 

I have a '93 Impreza and I'm looking to upgrade the stock 4EAT - it's not dead yet, but I want to be prepared.

 

Looking @ the  '91-'94 Legacy SS/TW or '96 - '98 Legacy Outback, GT or LSi or '98 RS (basically something that can handle more power when I upgrade the engine).

My main concern is if  the CONNECTOR(S) on top of the transmission - by the pitch-stop- work w/the 1993?

And will the TCU in the '93 work w/the newer 4EATs?

I know I'll need a different rear diff as the 1993 is a 4.11 and the others are either 3.9 or 4.44.

 

 

Thanks to John - "johnceggleston" for great info and I'd like to hear from anyone that's done this swap/upgrade/replacement.

Thanks,
TD

Edited August 5, 2014 by wtdash

[johnceggleston]

td,

if the connectors are the same,

the electrical will work.

 

take a close up of the connector and compare it with the 4.44 trans.

[wtdash]

For future reference and if anyone can corroborate, I got this info from another Subie site:

 

 

There is no relative difference in strength between the 4EATs. Your transmission will be able to handle both the 2.2 and 2.5 without issue.

Specific to Impreza: ... you are also limited to anything from 93-96. MY97 and later transmissions don't drop in because the transmission tunnel was enlarged.

Edited August 6, 2014 by wtdash

[johnceggleston]

 

Specific to Impreza: ... you are also limited to anything from 93-96. MY97 and

later transmissions don't drop in because the transmission tunnel was

enlarged.

this is not accurate.

all auto trans 90 - 98 have the same model number, TZ102Zxxxx.

(loyale not included, and maybe SVX )

 

in the late 90s, 95 - 98, the last 2 characters in the number represent the model the trans was installed in,

or probably more correctly, the speedo gears.

outback = BA

legacy = AA

GT = CA, i think.

 

the third to last character represents where in the series the trans falls,

B comes after A but before C or D.

in the impreza line they used a number.

 

and finally, in the late 90s, the fourth to last character represents the final drive ratio.

or probably more correctly, the front diff, ring / pinion and torque converter.

ALL auto trans in 2.5 L cars have a "2" in this position, and they all have the 4.44 ratio. (example, 97 obw = TZ102Z2CBA)

the ej22 and ej18 auto trans have a letter in this position, (example, 97 legacy L = TZ102ZACAA)

and the final drive ratio and torque converter size are the only differences.

 

i'm not an impeza guy, but i'm willing to bet $20 that all of the above is also true for the impreza as well.

and all you have to do to double check is look up each year, and model of impreza at http://opposedforces.com/parts,

and list the trans assembly ID# for each.

you will see the patterns.

 

regrettably, this pattern does not apply to the manual trans .

 

the impreza trans tunnel may have changed,

but the trans did not,

not until 99 when the phase 2 was introduced.

any auto trans 90 - 98 will bolt in.

if the tunnel changed, just use the mounts off of the old trans.

you just have to match the FD ratio,

or change the rear diff to match the new trans.

Edited August 7, 2014 by johnceggleston

[wtdash]

^+1

 

Thanks again.

TD