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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 08-26-2013, 12:33 PM   #15
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Originally Posted by PantsDants View Post
Just curious, why didn't you buy the shims and pinion bearing from him as well? Markup? He also told me to replace the pinion nut, FWIW.
Maybe his kit comes with it. I say I spoke with him, but really it was my brother. The rear end in his corolla has Weir axles, ring and pinion and pinion spacer. So he just got in contact with him for me since he already has a repor with him.

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Old 08-26-2013, 12:33 PM   #16
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Originally Posted by Hawaiian View Post
So, for the FI guys, would the IS300 carrier be a direct swap FD and all, so we can run the auto LSD and get down to a 3.9 FD without any other changes?
Theoretically, yes. You could also get down to a 3.7 if you wanted from a manual IS. I keep saying theoretically because the fact of the matter is I haven't completed this yet, but the IS300 carrier is supposed to just bolt right on.
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Old 08-26-2013, 12:40 PM   #17
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So...

- Ring
- Pinion
- Shim
- Carrier if you don't want down time

That's it? I don't care about down time, so could I just buy the 4.88 ring and pinion, find a matching shim, and go to town?
The bare minimum that I was told I would need, in addition to the ring and pinion, was shims, pinion nut, pinion seal, and solid spacer. However depending on how many miles are on your carrier, you may also need bearings.
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Old 08-26-2013, 12:42 PM   #18
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Old 08-26-2013, 12:50 PM   #19
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The bare minimum that I was told I would need, in addition to the ring and pinion, was shims, pinion nut, pinion seal, and solid spacer.
You won't need a solid spacer unless you're putting down MASSIVE amounts of torque. You'll break your factory trans long before your ring gear successfully shoves the pinion forward. My rear end had under 2000 miles and the factory spacer was reusable. Same for the pinion nut.

A solid spacer won't hurt but definitely isn't mandatory.

I would highly recommend adding side seals to your list as they'll likely need to be popped out to check diff clearances. They're cheap.
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Old 08-26-2013, 12:53 PM   #20
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by carrier you mean the actual differential?
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Old 08-26-2013, 12:53 PM   #21
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Yeah, I'm not looking to go bare minimum anyway. I'm looking to go long lasting, reliable, and done correctly. Saving money compared to the Mfactory 4.67 would just be a nice byproduct.
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Old 08-26-2013, 01:07 PM   #22
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For the record, according to: http://www.teammfactory.com/gearcalc...ission+1+%26+2

215/45/17 @ 4.88 final drive would mean...

1st - 29
2nd - 48
3rd - 69
4th - 87
5th - 106
6th - 138

I wonder what 6th gear would top out at with factory power and this ratio.
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Old 08-26-2013, 01:42 PM   #23
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by carrier you mean the actual differential?
By carrier I mean the "pumpkin" or housing that contains the differential. The two terms are often conflated so I figured I'd try to be as specific as possible. What I bought was a factory IS300 rear differential carrier, it comes with the differential inside obviously.
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Old 08-26-2013, 02:02 PM   #24
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You won't need a solid spacer unless you're putting down MASSIVE amounts of torque. You'll break your factory trans long before your ring gear successfully shoves the pinion forward. My rear end had under 2000 miles and the factory spacer was reusable. Same for the pinion nut.

A solid spacer won't hurt but definitely isn't mandatory.

I would highly recommend adding side seals to your list as they'll likely need to be popped out to check diff clearances. They're cheap.
Thanks. Is this the right part for the side seals? http://www.partsbase.org/parts/toyota-9031143009/
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Old 08-26-2013, 02:27 PM   #25
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Thanks. Is this the right part for the side seals? http://www.partsbase.org/parts/toyota-9031143009/
Yes, that's it.

My post here has part numbers for what's needed: http://www.ft86club.com/forums/showp...5&postcount=45

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Old 08-26-2013, 02:39 PM   #26
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Originally Posted by PantsDants View Post
By carrier I mean the "pumpkin" or housing that contains the differential. The two terms are often conflated so I figured I'd try to be as specific as possible. What I bought was a factory IS300 rear differential carrier, it comes with the differential inside obviously.
I'm not 100%, but I believe doing this will be the only way to do all the OEM final drive part numbers I posted before. From what Spence @ Weir Performance was saying, the internals in the stock FRS rear end are not compatible. Maybe @8686 can clarify with the OEM 4.56 he just purchased.
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Old 08-26-2013, 03:34 PM   #27
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Yes, that's it.

My post here has part numbers for what's needed: http://www.ft86club.com/forums/showp...5&postcount=45
Thanks again man, that's really helpful. I may just order all of those online rather than going with a kit that may or may not be incomplete.

Regarding the washers, would that be something a differential shop would just have on-hand? Or is there an actual set from Toyota? Same thing goes for the shims, are those specific to this application or is that something they could just have laying around already?
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Old 08-26-2013, 03:42 PM   #28
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Thanks again man, that's really helpful. I may just order all of those online rather than going with a kit that may or may not be incomplete.

Regarding the washers, would that be something a differential shop would just have on-hand? Or is there an actual set from Toyota? Same thing goes for the shims, are those specific to this application or is that something they could just have laying around already?
No prob. I updated my post to include diff washers as well.

I can't speak to what a dealer might have on hand for diff washers. A good performance shop will either fab their own or already have them on-hand. That's difficult to answer since every dealer and shop will be different.
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