KAAZ 3.90 for WRX -> JDM 6spd conversion?

Reply Subscribe

Thread Tools

Search this Thread

Oct 6, 2003 | 10:53 PM

East Coast WRX

Guest

Posts: n/a

KAAZ 3.90 for WRX -> JDM 6spd conversion?

I had an idea, I'm sure it has been discussed on here but archieves show nothing.

Instead of me doing a 3.90 legacy swap out rear LSD or a complete r180 sti swap why not do a KAAZ 3.90 LSD.

Can I order a ratio for them? If so in the mean time I can limp around with an open legacy diff. What do you think?

Oct 8, 2003 | 06:17 PM

Kevin M

Registered User

iTrader: (12)

Joined: Nov 2002

Posts: 18,369

From: Reno, NV

Car Info: 1993/2000/2001 GF4 mostly red

As long as they match the ratio of the front diff exactly, you can use whatever differential you wish.

Oct 8, 2003 | 06:30 PM

East Coast WRX

Guest

Posts: n/a

well, I need a 3.90. No one seems to know anything about the kaaz pieces.

I'll end up doing a legacy rear I guess.

Oct 13, 2003 | 12:58 PM

DeliciouSpeed

Registered User

iTrader: (2)

Joined: Nov 2002

Posts: 692

From: Somewhere in the Eastbay

You can just get the 390 ring gear, but i'd get the diff to it's cheap. yes it will work. You can also run a uk STI box it has the same fd as the wrx. Plus it has better 5/6 ratios. No DCCD though.

Nov 18, 2003 | 05:22 PM

gpatmac

VIP Member

iTrader: (3)

Joined: Nov 2002

Posts: 10,133

From: Lastweek Lane - Watertown, NY

Car Info: 02WRXpseudoSTiWannabeWagon

I got the 3.90 ring & pinion off of a '93 Legacy T, but now am too worried about the spiders to drag race; so I've got the same question as EC WRX.

Utilizing the JDM v7 6spd, the 3.90 ring & pinion, and a 3.90 rear diff, what does that do for me as far as durability?

As a side question, how difficult is it to replace spider gears?

Nov 18, 2003 | 06:36 PM

East Coast WRX

Guest

Posts: n/a

I've heard there is a suretrac r160 rear diff. The output cups are the wrong size though. You can either get teh right size ones or try and swap out your wrx cups into it.

In the end I picked up an r180 rear diff with rear axles/brakes. It was more than I'd like to have spent, but now I have bling bling gold brakes all the way around :P

Nov 18, 2003 | 06:52 PM

Imprezer

Admin v2.0

iTrader: (9)

Joined: Nov 2002

Posts: 6,965

From: Alameda, CA, USA

Car Info: 02 Black Legacy GT

The diff's do not come with "ratios". The ratio is determined by the gear that is bolted to the diff and the pinion that the gear is driven by. Hense, you can use that KAAZ diff.

However, I recommend going with CUSCO diffs. Not because I like them or because I am a CUSCO advocate, but because those diff are really the bomb. Very street friendly. Easy configurable (1, 1.5 or 2 way; locking characteristics; etc).

You can even stick a R180 CUSCO diff into a R160 melon, IF you use a higher capacity diff cover (SYMS, BOZZ Speed, J Speed, Flatt Racing).

Also, CUSCO have about 8 different diffs for the rear for WRX's. Type RS and Type MZ with variety of configurations. If you have any more questions, feel free to ask me here.

Dec 29, 2004 | 09:22 AM

latinskllz

Registered User

iTrader: (1)

Joined: Nov 2002

Posts: 137

From: Orlando, FL

Quote:

Originally Posted by Imprezer

You can even stick a R180 CUSCO diff into a R160 melon, IF you use a higher capacity diff cover (SYMS, BOZZ Speed, J Speed, Flatt Racing).

Also, CUSCO have about 8 different diffs for the rear for WRX's. Type RS and Type MZ with variety of configurations. If you have any more questions, feel free to ask me here.

If you stick a R180 Cusco Diff, would you have to get R180 STI rear axles? Where can you get a higher capacity diff cover btw?