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Old 06-25-2014, 03:24 PM   #1
jonser
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Default Rear diff/hub swap

Ok, so I'm. Not sure if this is posted to the correct place, so forgive me, but I am about to tackle a rear diff and hub swap for my 03 wrx -> v7 JDM rear diff/ hubs/ axles/ brembos. I'm wondering what surprises I'm going to run into while doing this swap, and how bad of a job it is to do by myself, more or less. If you wonder my proficiency level, well, I did the motor/trans swap myself in a rather small garage with no help. I realize the diff is heavy as 5#!7 and do have an extra set of hands to help this time, but if anyone has any pointers, advice, things to have on hand before you start, etc... I will gladly take any advice given. I assume it's fairly straight forward, but my mental hangup is the emergency brake. I can see that giving me problems. Can anyone comment otherwise to how that will transfer from an 03wrx to any sti rear hub/rotor setup? Should they connect the same, aside from the obvious larger hardware? I'm not afraid of drums, but have yet to work within internal drum like this. Any help would be awesome. Planning to do this Friday. Thanks in advance
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Old 06-26-2014, 08:19 AM   #2
Vlad
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I'm close to that part of my project.
My research so far shows that at one point there was an opinion that you need to get Sti cables , for the parking brake to work.

There are 3 variables:

which year body and existing cables (they change with the introduction of the '05 console with 2 cupholders possibly the parking brake lever got moved forward and requires longer cables.

Which year parking brake handle are you going to use, some Sti may have a different and more rear mounted cable hookup

Which year parking cables you are going to use.

Oh, and from what I'm seeing incompatibility puts you out of adjustor range.

My simple answer will be to keep my cables and parking brake handle and cables and hope that they extend enough to reach with the rear Sti hubs, I'm hoping to use '04's

As far as the drum itself, once you do Sti hubs, you're on Sti rear brakes, so there's no unknown there.

Last edited by Vlad; 06-26-2014 at 08:31 AM.
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Old 07-15-2014, 01:49 AM   #3
jonser
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Default

Thanks for the info. I took the leap of faith and did my swap this weekend/today. It's finished now, full STi rear setup. What I was able to keep from the existing setup was the parking brake cable/lever setup and the cradle/subframe. That's it. Everything else came from a JDM v7. So, bugeye to bugeye, but it's in, works, fits, and drives. I'm using old rotors and pads and have a squeaking coming at random times, and am hoping it's that. I will be going over everything again and re-torquing this weekend and inspecting. Hopefully stuff just needs to seat itself and break in. All said and done though, 1 1/2 days of work with very minimal help, only to bleed the brakes and tighten axle nuts, and help aligning the diff and raising with 2 jacks.
I did it a sort of different way, as I couldn't get the long bolt hub side for the lateral links off, so I had to keep everything together and install the diff, then axles into the diff, and then fandangle everything together working with the axles in the hub, then starting diff side and working my way out, with the non adjustable lateral link first... It's a real pain to get that bolt in with the axle in the diff, but it's possible. Otherwise, I'd say take out the long bolt and remove the hub with the lateral links and trailing arm installed, then you can just do the axle and reinstall jus the hub... Wasn't possible for me, but it worked non the less. I ended up using an STi driveshaft this time around, but you can reuse the wrx one if need be. I've done it both ways now.

To clarify: it's a v7 JDM full swap into an 03 USDM WRX sedan. Same bodies, so everything fits. Front hubs are interchangeable, as I have one from each on right now. Rear subframe can house the STi swap, and I DID reside existing parking cables. All said and done, drove home with no issues, no binding, no grinding, no clunking, and lots of stopping power. Hoo-rah to some determination and a few nuts and bolts.
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Old 07-15-2014, 07:06 AM   #4
Vlad
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Which gearbox are you using?
With the Sti gearbox you write that you used either the long WRX driveshaft or the Sti short driveshaft and either worked? What takes up the extra length of the WRX driveshaft then?
It's 3 inches or so, no?
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Old 07-15-2014, 03:35 PM   #5
jonser
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The wrx DS has some give to it. It uses a flex joint instead of a full yoke. The STi DS has a full yoke in it, so there is no play in length with that. I've been using a 6 speed the whole time, both before the swap and after... Now I'm just using a JDM 6 speed instead of a USDM 04 STi 6 speed. Same lengths. Just now I don't have dccd where the trans before did. You can keep the wrx DS and use the 6 speed. I cannot fully say how this will work with an R180 though, as I tried both shafts in with an R160 and it worked, but chose to go straight to STi DS for the R180. I'll try to post some pics later this week for you if I can get all the parts next to each other. Would rather not pull the DS again though. Can show both under the car.
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Old 07-15-2014, 03:38 PM   #6
jonser
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Join Date: Apr 2007
Chapter/Region: BAIC
Location: San Francisco CA
Vehicle:
2003 WRX->STi->s202
Multi

Default

Also, if the STi DS is shorter than the WRX, I had been using the WRX DS for the last 5 years before I bought the stuff for my swap and hadn't known there was a difference. 6 speed up front, WRX DS in the middle, and R160 at the rear. Hope that helps clarify. The WRX DS does have a good amount of play to it.
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