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  #1  
Old 04-03-2014, 02:40 PM
presslab presslab is offline
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Performance 4EAT

I've got my 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.

Anyway, any pointers would be great.
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  #2  
Old 04-07-2014, 08:38 PM
NiftySVX NiftySVX is offline
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Re: Performance 4EAT

Are you running a VTD transmission? There is a guy who supposedly put another clutch plate in the high clutch pack but doesn't share the info. I would mod the pump for more pressure.
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  #3  
Old 04-09-2014, 09:38 PM
presslab presslab is offline
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Re: Performance 4EAT

No, it's regular MPT.

Alto offers a special "Red Eagle PowerPack" high clutch with 6 steels/frictions instead of 5. No machining, I'm going to go with that.

To add more frictions to the forward clutch I would need to machine the forward apply piston. I do have a lathe but I don't really want to mess with it as my old frictions looked just fine.

I have a shift kit with some custom holes drilled, so I have a lot more line pressure. The 1-2 shift at WOT is pretty mean! I also upped the sol-A duty cycle in the TCU.
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  #4  
Old 04-14-2014, 01:39 PM
Jvan Jvan is offline
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Re: Performance 4EAT

I need to replace my auto trans since it started to slip but I can't perform an upgrade myself. Any one have a member source for purchasing an upgraded performance transmission. I tried to contact Ecutune but web page doesn't respond and haven't received response from PM sent a couple of days ago.
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  #5  
Old 04-16-2014, 12:05 AM
presslab presslab is offline
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Re: Performance 4EAT

I just read in another thread that ECUtune is out of business. I've heard of Import Performance Trans and Level 10 for performance rebuilds, but I can't vouch for either of them.

Still waiting for the Alto parts, the distributor is dragging their feet... I hope I remember how it all goes back together.
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  #6  
Old 04-16-2014, 08:10 AM
Jvan Jvan is offline
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Re: Performance 4EAT

Thanks for the info. I tried the Ecutune web address but couldn't connect and sent a PM to member who ran it but didn't receive a return email. I also heard of Level 10 but thought they were very expensive. I'll check out both of your suggestions (w/o any recommendations on your part). I don't have the know how or tools to attempt myself.
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  #7  
Old 04-16-2014, 08:50 AM
NiftySVX NiftySVX is offline
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Re: Performance 4EAT

I had a level 10 transmission in mine. It cost more than $6000 after I sent it back 5 times and in all that time it lasted 5000 miles before I started over.

Can you post a pic of the clutch pack with the six discs when you get it?
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  #8  
Old 06-26-2014, 07:16 AM
presslab presslab is offline
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Re: Performance 4EAT

I finally received the parts. The trans shop that ordered them for me were totally dragging their feet. I put all the clutches together last night, everything went together fine and the clearances were ok.

Here are the part numbers of what I ordered. My trans is a mismash of different parts so you'll probably need things different... But it gives you an idea. I did need the 3.4mm high clutch pressure plate, and even still clearance was tight.

(6) Raybestos R573765
(4) Raybestos R573790
(6) Raybestos R573780

(6) Alto 075703K152
(1) Alto 075760-340
(2) Alto 075707-225
(7) Alto 075700A
(2) Alto 075950
(3) Alto 075708


I have attached a pic of the 1.75" brake band (the new one is on the right) and of the Kolene steels and Raybestos green kevlar frictions. The Alto Red Eagle frictions were not available.
Attached Images
File Type: jpg IMG_20140626_055401.jpg (186.3 KB, 238 views)
File Type: jpg IMG_20140626_055658.jpg (112.9 KB, 214 views)
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  #9  
Old 06-28-2014, 10:40 AM
presslab presslab is offline
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Re: Performance 4EAT

I have a few miles on it, and so far so good. The 2/4 band took a bit to break in, but it's a definite improvement. The high clutch is much firmer as well. All the other gears work as expected.

I also installed a new transfer clutch from Subaru (seems it had Kolene steels too, by the looks) and it's a bit grabby. We'll see how it is when it gets more breaking in.

Anyone have opinions on fluid? I am using Valvoline Maxlife DEX/MERC ATF. It's pretty cheap for a synthetic, and the specs are pretty good.
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  #10  
Old 07-07-2014, 06:18 PM
NiftySVX NiftySVX is offline
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Re: Performance 4EAT

The transfer clutch will need to be broken in. You'll be surprised how long this takes. Did you use the thinner bearing and updated drum in the high clutch? The hub is also slightly different, it seems that they really wanted to increase clearance in the high clutch area and provide for lubrication.
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  #11  
Old 07-07-2014, 06:29 PM
presslab presslab is offline
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Re: Performance 4EAT

Quote:
Originally Posted by NiftySVX View Post
The transfer clutch will need to be broken in. You'll be surprised how long this takes. Did you use the thinner bearing and updated drum in the high clutch? The hub is also slightly different, it seems that they really wanted to increase clearance in the high clutch area and provide for lubrication.
I've been tuning the TCU to fix up the transfer clutch, it's going pretty good. I thought about break-in but it's my understanding that the factory breaks them in. When I bought the new ones from Subaru I could see they were worn already, and they were all in a matched set (already assembled) and covered in fluid. They may need to break in a bit more, we'll see.

I had to use the old style high clutch drum to use the special Kolene 1.52mm steels. With the newer drum I could not get 6 frictions, the tooth pattern is different. The old drum also required the weaker reverse frictions, unfortunately. I think there is some drum that's in-between that takes the Kolene 1.52mm steels and the newer reverse frictions, but I couldn't find one.

I was able to use the smaller bearing thrust plate and newer hub, so that's an improvement.
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