Welcome to the North American Subaru Impreza Owners Club Saturday April 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Subaru Models > Legacy Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 10-18-2003, 08:45 PM   #1
leondal
Scooby Newbie
 
Member#: 43114
Join Date: Sep 2003
Location: Pownal, VT
Vehicle:
1998 Legacy GT Turbo
Green

Default My Transmission Project

Well, my GT transmission decided to be stupid, so I'm beginning the long journey of a complete replacement, with a rebuilt, solid transmission.

Step 3 is complete, as I've found the replacement tranny and rear diff, and have begun dismantling it. This is a 97 Outback tranny and diff. The outside is a bit dirty and there's some rust, but the gears are looking pretty good, and none of them will need replacement. The full price was $500 from a salvage yard.

Step 2 will involve bringing the gears to a machinist to have them deburred.

Step 3 will involve me sending the gears and synchros to 300 Below for cryo treatment. This should really add some durability.

Step 4 Shotpeening. I'll bring these gears to a certified aircraft shotpeener for some shotpeening action.

Step X while all these things are going on, I'll be cleaning up the case and painting everything.

Step 5 Transmission installation!

Wish me luck on my journey, I have high hopes that this will create a truly formidable transmission setup, that'll hopefully never die.
* Registered users of the site do not see these ads.
leondal is offline   Reply With Quote
Old 10-19-2003, 12:59 AM   #2
pilfflip
Scooby Specialist
 
Member#: 40484
Join Date: Jul 2003
Chapter/Region: NWIC
Location: Salem, OR
Vehicle:
'02 Murdered WRX
'02 Silver Legacy

Post Good Luck!

Well Good Luck buddy! I'm supportive of anyone who is trying to over come the Subaru's Achillies tendon (their tranny).

~Mike
pilfflip is offline   Reply With Quote
Old 10-19-2003, 09:30 PM   #3
Charlie-III
Scooby Specialist
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

Default

Keep in mind that the OB 5th gear is worse for cruising than a GT 5th.

I can't remember about the others though. But, I could check if you want.
Charlie-III is offline   Reply With Quote
Old 10-19-2003, 10:48 PM   #4
KD7000
Scooby Specialist
 
Member#: 16653
Join Date: Mar 2002
Chapter/Region: NESIC
Location: Central MA
Vehicle:
2012 Mazda 3
2004 Honda Pilot

Default

Shouldn't you shotpeen prior to cryo-treating?

From a materials standpoint, it just seems like it would be a better progression for the metal. But I am not a metallurgist, nor a tranny expert, so I could be mistaken.

Interesting process, though. If, in fact, you are supposed to cryo-treat and then shotpeen, I'd like to here the reasoning.

-Brian
KD7000 is offline   Reply With Quote
Old 10-20-2003, 02:00 PM   #5
etam
Scooby Specialist
 
Member#: 439
Join Date: Oct 1999
Chapter/Region: E. Canada
Location: yyz
Vehicle:
www

Default

I am curious how much hp your engine is putting out to require a special built transmission. Or this is required even for slightly modified engine.
etam is offline   Reply With Quote
Old 10-20-2003, 02:31 PM   #6
MY99 2.5GT
Scooby Specialist
 
Member#: 5030
Join Date: Mar 2001
Chapter/Region: MAIC
Location: Martinsburg, WV, USA
Vehicle:
1999 Legacy 2.5GT
05 Legacy GT 06 Armada

Default

If your modifying for more then 300hp and similar torque your barking up the wrong tree

If you remember an article in SCC years ago about Shiv busting gears from a Dog Box in his turboed 2.5RS running almost 300 front wheel hp.

Its not gear strenght that is the issue with these transmissions. Unfortunitely the case itself is weak. If enough power/torque is transmitted to the input shaft of the trans it causes the case to flex and in turn seperates the gear teeth causing them to chip.

Best option would be to find a WRX trans and buy/fabricate a trans brace.

Brad
MY99 2.5GT is offline   Reply With Quote
Old 10-21-2003, 05:12 PM   #7
leondal
Scooby Newbie
 
Member#: 43114
Join Date: Sep 2003
Location: Pownal, VT
Vehicle:
1998 Legacy GT Turbo
Green

Default

You're right, the shotpeening will go before the cryo, my bust.

I don't see myself going above 300 HP, though who knows what the future holds? I'm turboed right now, but i'm only running mild boost. If I plan on something huge in the future, I'm going to have to make a huge investment anyways.

My main concern is making a small investment now to have a long lasting transmission that I won't need to worry about for, hopefully, a long time. I say take the time and do it right.

The cryo treating process is a lot cheaper than I had thought before I made the initial phone call. It runs around $2.50/lb. They will do an entire 4 cylinder engine for $450. This process will work on just about anything, including turbo housing and axles.
leondal is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Finnally got my new rims on the GC and a pic of my new project Car for next year bstoehr83 Member's Car Gallery 25 04-13-2010 07:57 PM
My DIY Projects on my 08 STi RedefinedTR Interior & Exterior Modification 32 07-31-2009 04:47 PM
Transmission project deuce189 Transmission (AT/MT) & Driveline 4 06-04-2004 01:02 PM
My next project since my car is finished. Gran Tourismo Arcade Game STEALTH-WRX Off-Topic 64 01-26-2004 01:47 PM
OT Help Me with my School Project (Photoshop my pic) The Enemy Off-Topic 5 01-09-2004 11:13 PM


All times are GMT -4. The time now is 03:58 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.