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Old 07-16-2020, 12:44 PM   #1
Scooby Newbie
Member#: 163483
Join Date: Nov 2007
Location: SE Minnesota
1998 07 swapped RSTi
Diamond Black Pearl

Default Subaru STI 6MT Teardown - Not a How-To

After not finding much of any type of documentation (aside from the FSM) on tearing down the STI 6 speed transmission, I decided to throw something together as a reference for anyone else looking. After shredding 2nd gear in my transmission I've been motivated to trying to get the gear stacks out of the transmission myself, mainly to save on labor costs on the rebuild. This is not a fully inclusive how-to, but covers everything involved in removing the case and gear stacks. Hopefully it will be useful to someone!

I didn't document anything having to do with removing the transmission from the vehicle - it would be my assumption if you're looking to tackle this yourself, you're mechanically savvy enough to have gotten that far...

I didn't document my steps on removing the tail housing of the transmission, but IAG's instructions for transfer gear installation is a great reference (first 4 pages)...

That leads me to this point. The trans is on the table and the tail housing and output shaft have been removed...

Note that this specific transmission is from an '07 USDM STI and should be similar to 08+ USDM STI. 04-06 are slightly different in that they still utilized an oil pump.

I set the case on a couple of 2x4's so there is clearance for the input shaft underneath (it protrudes from the transmission bellhousing about an inch).

Disconnect the diff electrical plug

Now the diff will just slide right off of the pinion shaft. There are 4 of these clamshell bearings that go on the snout of the pinion shaft, between the diff and the pinion shaft

You should now see this view (pinion shaft with diff removed pictured top (sleeping doggo optional))

Side view

Remove this roll pin

Roll pin removed

Remove snap ring and washer


Last edited by joebush44; 07-16-2020 at 12:53 PM.
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