BBPeik

I thought we had the water to oil cooler stock on USDM 5th Gen GTs. There's something there for sure above the filter.

 

 

Stickied per request.

I thought the same thing. There is something that sure looks like an oil cooler there.

From what I understand, a center diff rebuild in a manual transmission Subaru is pretty straight forward.

Given that I just finished completely disassembling my transmission I can say that the center diff would be relatively easy to replace diy. Conveniently I have a whole trans in pieces so I can give anyone that needs them very specific pictures.

I was not aware that you could turn the gear indicator off. That seems like the easiest solution.

As far as the boost in certain gears. It is limited factory in 1st and 2nd, but as soon as you get a tune that goes away so it is no longer an issue.

Yeah as far as I can tell the only sensors are the reverse and neutral sensors. Depending on what year trans I get it may have a vss as well, but that is not an issue with our cars so I can just plug the sensor hole or ignore it. Obviously I will hav ethe DCCD wiring as well.

I know that on a lot of cars you can go into the ecu and set the gear ratio, tire size etc. Hopefully this is the case on our cars as well.

I'm no tuner but, I may be of some assistance in getting it to show the correct gears through wiring. I'm somewhat familiar to the legacy transmission switch that determines the signals sent to the B.I.U. for display of which gear you are in. Not so much the STI but, that's all in the "vacation pics". If you are willing to do some rewiring, I can look into both to let you know what needs to be done if possible. Only reason I know is when I was messing around helping out someone on here put the updated cluster in a GT. That was going from the auto to manual trans of different years and electronics. Ended up not finishing that part do to some CAN bus issues from different components of manual to auto versions. Did get it to display gear numbers on the cluster but, it had other trouble lights come up. If it's just manual to manual, it might just take some moving of wires for the switch.

I thought it knew what gear you were in based on engine rpm and speed. Not positive though.

So here is my overall plan for the swap. I am planning on buying as late a model as possible STI trans with DCCD and just using a DCCD controller for that. I will also be getting driveshaft, axles, hubs,diff, etc.. Here is the basic plan.

1. Mount trans to engine and bolt up with existing trans mount. Should be possible.

2. Figure out how to mount it to existing mounts

3. Looks like the STI shifter will work based on the measurements that I took already. Might need some fiddling, but should work.

4. Wiring for reverse and neutral sensor should work fine with our harness.

5. Install rear diff. This part is pretty easy.

6. Figure out what I need to do to the driveshaft. Again easy, any mods can be done at the driveshaft shop I use. STI driveshaft is beefier, so I plan on modifying that.

7. Attempt to install the hubs. Not sure how these will mate up to our cars. If they go in I will use them as the STI axles as they are much stronger. If they do not I will take the STI axles and hybrid them with our axles.

8. If I use the STI axles and hubs then I will get some Brembos and new wheels and call it a day.

Thoughts?

Both great offers and both accepted.

Thanks guys

So I just finished tearing down the transmission. Turns out that both front diff bearings were bad as I suspected, but the real noisy one was the bearing at the back of the center diff. When you spin that rear gear it is noisy as hell. Mind you this bearing was replaced 20k ago when they replaced the center diff. Very disconcerting for any of us with a lot of power. Mind you most the time I drive like a grandpa and I pretty much baby my car driving wise. It is not like I race all the time. This transmission is a weak link for sure.

The last picture is the bearing that is the most noisy.