86BRATMAN

That's a phase 1 vs phase 2 difference. Not legacy vs impreza difference. Case and point. https://m.ebay.com/itm/98-1998-Subaru-Forester-TRANSMISSION-COMPUTER-MODULE-UNIT-TCM-TCU-31711AD660-/122675307739

I've got a couple of 4.11 final drive phase 1 tcus from the first few cars legacys I parted out. They've been sitting on a shelf for about 8 years now. Duty C solenoid failure is much more common than tcu failure. There have been a few cases documented on here over the years. But it is very, very rare.

No, the 01 tcu won't work in your 98. You need one from a phase 1 car. Direct replacement will be from a 96-98 outback. But any 95-98 can be used for diagnostic purposes.

And people wonder why I bad mouth the "coolant conditioner". It's nothing more than stop leak that Subaru decided to use as a bandaid to get cars through the warranty period.

The 97 legacy fsm shows maf signal at tcu plug B54 pin 9.

There is more than just tps signal shared between the ecu and tcu, even on phase 1 cars. You have maf, engine rpm, torque cut, vss, tps signal and tps power supply, control system ground, sensor ground, and then the diagnostic wiring that gets tied together for the obd and/or ssm port.

That would be the easiest way to do it. Adding in the tcu wiring would require tearing down another harness anyway.

You'd just leave the tcu and transmission wiring intact in the donor harness. Would make the strip down take a bit longer, but not much more difficult.

They were a built on a shared chassis with the Acura Legend.

You're thinking of the ea82 tanks, there is a definite difference between the tanks on my 4wd and 2wd hardtop.

I just saw your other post about the lift, if you're going to be doing a full round of drivetrain drop brackets you can use a 2wd fuel tank as well. A 3" drop of the rear suspension components gives enough clearance for the differential to clear the 2wd tanks. These days it may not make a tank much easier to find, but it opens up the possibility to the whole line of ea81 body styles.

You can use a tank from any 4wd ea81 car. A wagon tank will direct fit, but a hatch tank can be used with some support brackets because it's shorter front to rear.

I have used several chras from what I'm going to assume is the same European company. I've never had an issue with their complete chra. From where I'm sitting this seems to be an assembly error, not a product quality problem.

They're both phase 1 4eats, they'll interchange. You'll have to remove the electronic speed sensor from the newer trans and install the speedometer cable from the old one. Yes, you can simply swap the pinion flange from one diff to another.

Be prepared to swap the pinion flange too. They changed to a larger bolt pattern for the driveshaft somewhere in the mid 90s.

Somewhere in the anuls of the site there are topics about chipping the stock na ecu. That's the only why you'll get anywhere significant without a difference ecu.

For what it's worth, the ea81 3at 4wd tailshaft will weigh exactly the same as manual.

Something had to have been modified, I ran an ej207 in mine. First fitting of the engine had the timing covers literally touching both frame rails.

Dohc engines into the ea81 chassis do need a bit of massaging to give clearance around the timing covers. Couple minutes with a hammer and you're good to go.

I have an ej and manual awd trans in my ea81 hardtop with no drivetrain drop. Two inches would be plenty to get a 4eat to fit in the tunnel.

On mine I used the ej harness to run the signal into the cabin, then tapped into the back of the cluster. I left my setup completely reversible just in case for some reason I ever decided to go back to the ea81t.

You can get some adapters to run the ea oil pressure sender off the port where the ej pressure switch lives. Then run it through the ej harness to feed the stock gauge.

presslab used an early legacy tcu to run an ea82t 4eat. There is no reason you couldn't do the same for this swap.

Grab a fwd ej 4eat front diff section. They're 3.70 final drive like the xt6 4eat and it will bolt in place of the existing piece. The wiring will be a little more involved than a manual trans ej swap because you'll have to connect the tcu signals along with the rest of the normal wiring.

The na mpfi ea82 was also in some of the gl-10 models.