Jeff Lange

iTrader: (1)

If it fits, it will operate just like the 2010+ IS F does, which is pretty well I reckon, haha.

Jeff

Jeff Lange

iTrader: (1)

Since my first post I've looked into this a bit more. The differences to the housing/cover seem to be somewhat minor but may pose some issues.

The main housing and rear cover are both definitely different. The IS F has cooling fins on the underside, top side and rear cover. The RC F only has cooling fins on the underside and rear cover, but not on the top side. The RC F differential housing seems to be lightened a bit (there is a void in the front mounting arm on one side). Beyond that the housing looks very similar and may actually bolt up without too much trouble. The rear LH mount on the RC F has the 2 mounting bolts arranged vertically, while on the IS F the bolts are arranged horizontally.

I would expect that if you swap the IS F rear cover on to the RC F differential it will likely bolt in without issue, but that's assuming that the front mounts are in the same position, which I can't tell for sure without measuring. They look right though.

EDIT:

IS F




RC F




Jeff

lobuxracer

iTrader: (2)

The bushing is round on the outside, so the orientation of the bolts isn't a big deal at all. Just reclock the bushing - put in a polyurethane set - and all is good.

Jeff Lange

iTrader: (1)

Also true, assuming the bolt spacing is the same. If not you could try an RC F bushing if the OD was the same or a custom bushing if all else fails.

There are options. I'd still probably just grab an IS F Torsen if I was going to do it though, no fuss for the same performance.

Jeff

Jowett

I have an RC-F diff, but my access to an F car has disapeared. If someone else want to take over this swap, drop me a message.

Jowett

Anyone interested??

lobuxracer

iTrader: (2)

If anyone in Atlanta wants to try it out, I'll help with the install at no cost to the owner. I am really curious if it will fit.

MileHIFcar

Shoot! This is a great opportunity for any 08/09 owner that's been thinking about getting an OEM diff (torsen 10+) or a Giken!

Lance is offering his help/expertise on this and probably would be a first for the community

viprez586

Any update to this with a minor bushing change perhaps making it a possible bolt-in affair?

GymRat86

Bring this back from the dead... Tomorrow I will be receiving my 2015 RC-F LSD with 36k miles on it that I bought for 850$. I will be installing this into my 2008 IS-F, and looks like I will be able to swap the rear covers to solve the rear mount problem...I will keep you guys posted and post pics...and just to let you know there are way more RC-F lsd diffs for sale that IS-F lsd diffs...bunch on ebay

viprez586

Awesome, make sure to take some pictures. I too have been browsing for RC-F parts but due to my recent engine failure I'm going to have to wait for other goodies.
I was tempted to get an RC-F shortblock as well but I'm concerned about higher compression pistons and the stock ECU being able to compensate for such.

GymRat86

I will definitely take pics...you should be able to do that swap and then have RR racing tune it!

here are pics of the diff..has 36k on it

GymRat86

viprez586

You would think so, but Rafi didn't seem to indulge much on that idea in my correspondence with him.

samjones

iTrader: (1)

I hope it works!