Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Performance 4EAT

4EAT

  • Please log in to reply
11 replies to this topic

#1 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 03 April 2014 - 03:46 PM

I've got my '98 4EAT trans apart and I'm about to order some parts to rebuild it.  Does anyone have recommendations?  I've done the TCU mods to increase cruising line pressure, a shift kit, and a high stall torque converter.  I put that into a JDM trans with low miles and the high clutch is shot a year later.

It looks like maybe Alto offers a 1.75" carbonite band, and they have some high energy frictions.  What does it take to fit another friction/steel in the high clutch?  Some machining I guess, and a different pressure plate.
 


Edited by presslab, 03 April 2014 - 03:46 PM.


#2 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 9,040 posts
  • Charlottesburg, VA

Posted 03 April 2014 - 04:28 PM

Pull it apart and measure the clutches. Maybe you can match them up to a stronger set.

With the higher line pressure would you need to re-calibrate one of the spool valves to prevent early engagement of the high clutch?
(Maybe that's part of the shift kit?)

#3 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 03 April 2014 - 04:42 PM

Maybe there are some thinner steels/frictions too, so I can cram more in there.  A lot of Nissans use the same trans internals so there's a fair amount of stuff out there but it's hard to know what works with what.

 

The TCU controls the high clutch, so the higher line pressure only makes for firmer shifts.

 

I'll post some photos later of the tear-down.



#4 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 03 April 2014 - 05:55 PM

Here's some pics.  The last one is the smoked high clutch.

 

IMG_20140403_125106.jpg

IMG_20140403_125943.jpg

IMG_20140403_150853.jpgIMG_20140403_152926.jpg

 



#5 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 9,040 posts
  • Charlottesburg, VA

Posted 03 April 2014 - 09:27 PM

Yeah that's lookin kinda toasty.
Are those single side friction plates or double side?

#6 CNY_Dave

CNY_Dave

    03 LL Bean H6

  • Members
  • 1,448 posts
  • Near Cortland NY

Posted 04 April 2014 - 09:03 AM

Don't know if it'll swap into a 98 (parts or whole trans) but the Gen 2 H6 4EATs have more clutch plates for at least one of the stages.



#7 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 04 April 2014 - 10:20 AM

If you look close at the photo you'll see most of the frictions are worn down to the metal.  Yes, the friction is on both sides.  Alto offers thinner Kolene steels, but it requires the older high clutch drum, so I need to find one of these.  I actually had one but the girlfriend made me throw my old parts away.  I have already 5 frictions of the stronger Outback trans, but with the thinner steels I should be able to get 6 frictions.  I would also be upgrading to the Red Eagle high energy frictions.

 

I know some phase 2 parts work, for example I have a phase 2 torque converter and input shaft.  But without a phase 2 trans here to compare I can't figure it out, unless someone has done it before.



#8 ivans imports

ivans imports

    1000+ Super USER!

  • Members
  • 2,954 posts
  • lumby bc canada

Posted 04 April 2014 - 10:56 AM

Replace the forward drum its stator and its clutch pack for the one from 95-99 outback uses bigger wider clutches and has more holes for oil flow and is a harder steel stator if you haven't already got that



#9 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 04 April 2014 - 03:45 PM

My forward clutch frictions are 36T, 1.6mm, qty 5.  The catalog shows that it's for 96-98 Legacy, I'm not sure if it's Outback or not, I'm guessing it is as the trans was mated to an EJ25.  To add more frictions I would need to machine the apply piston.  Does the forward clutch have problems?  My frictions looked fine, and hardly worn.



#10 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 09 April 2014 - 10:29 PM

I got my high drum (from a Nissan) from eBay and it looks like it will work.  I can use the special Alto frictions and fit one extra pair in there.

 

The only downside is that I need to use the older reverse frictions/steels, which are not as wide.  Oh well.  I think reverse goes out not because the frictions just wear out but more so because the seals on the reverse drum support go bad and let the reverse clutch engage while going forward.  I have the special steel sealing rings here that came with the shift kit.



#11 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 9,040 posts
  • Charlottesburg, VA

Posted 09 April 2014 - 11:01 PM

Is that reverse clutch also used to engage any other gear?

#12 presslab

presslab

    Subaru Nut

  • Members
  • 867 posts
  • N. California

Posted 10 April 2014 - 12:10 PM

The reverse clutch is only used for reverse.  There is also the low/reverse clutch which is used in reverse, and when the shifter is in "low".  This provides engine braking in 1st gear, otherwise there isn't any.

 

I tried to order the parts from Alto this morning.  They won't sell direct.  Luckily I know a couple shops that will order it for me, but it's a pain.







Also tagged with one or more of these keywords: 4EAT

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users