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Fourth Member to Install an IS300 Torsen LSD on an IS250

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Old 11-05-13, 04:04 PM   #1
es808
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Default Fourth Member to Install an IS300 Torsen LSD on an IS250

Like the others before me, I've successfully installed an IS300 LSD on my IS250. I purchased the MT version so the gearing is not ideal like the AT version. But still a big upgrade from the open diff.

I wanted to start by saying that this installation was a little challenging and I learned a couple of things along the way. I wanted to share some tips with anyone who will attempt this in the future to hopefully save time and energy.

Thanks to Jeff Lange and B16da9 for their posts and especially to B16da9 for his advice and help through PMs.

I used a jack and stands to raise the rear of the car up about 24 inches or so. With the method that Jeff did, by simply dropping the diff and then raising it up, will only work if you have the *** end of the car high enough or the car is on a lift. You need clearance to be able to reinstall the side shafts.

I didn't have the car raised up high enough so with the differential on the jack, there wasn't enough room to install the shafts. The reason I could remove it easily was because after the shafts were loosened and the jack was all the way down, you can move the jack from underneath the differential and the shafts separate completely. Trying to reinstall it on the ground then muscling the differential up to the jack was difficult. It would have been easier with a friend for the installation. In the process, I tore a brand new side shaft seal trying to get the shafts aligned and the diff onto the jack.

At this point, I had to jack up the diff and secure it. Then, I removed the brake hub/shaft assembly to get the shafts into the diff. I wanted to avoid taking apart the suspension but I didn't have much of a choice.

Total it took me about 6 hours to remove and install but should have been done in about 2-3 hours. Not hard at all...just a learning process on my end.

Here's a pic of both differentials side by side. The one on the left is the new torsen LSD:
Click the image to open in full size.

Differential cover with red high temp RTV silicone to seal it:
Click the image to open in full size.

Internal pic of the IS300 LSD:
Click the image to open in full size.

I love the traction you get with the LSD and 2 wheel burn outs are awesome! I highly recommend this performance upgrade.
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Old 11-05-13, 05:06 PM   #2
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Congrats on your upgrade! Taking corners is definitely a lot more fun with a LSD.
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Old 11-05-13, 05:32 PM   #3
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wish i can use those on the AWD's lol
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Old 11-05-13, 06:54 PM   #4
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Nice work!
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Old 11-05-13, 11:48 PM   #5
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Thanks guys! I'm always willing to help members if they have questions. Don't hesitate to post or PM me.
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Old 11-06-13, 12:16 AM   #6
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Quote:
Originally Posted by NYKnick101 View Post
wish i can use those on the AWD's lol
If you have a 2009-2013 IS250 AWD, grab the rear diff out of an FR-S or BRZ. Bolt-in.

Jeff
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Old 11-06-13, 08:08 AM   #7
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Quote:
Originally Posted by Jeff Lange View Post
If you have a 2009-2013 IS250 AWD, grab the rear diff out of an FR-S or BRZ. Bolt-in.

Jeff
Been looking but so hard to find
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Old 11-07-13, 01:00 PM   #8
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Here's a list of seals and parts that I purchased and replaced on the LSD. I listed the optional oil seal for the front shaft and dust deflector which I didn't purchase.

Lexus Part Number ......................Description................ Quantity Req'd
9031143009................................Oil Seal, Side Shaft..............2
9034118035................................Drain Plug...........................1
1215710010................................Drain/Fill Plug Gasket............2
9034118032................................Fill Plug..............................1
9093003031................................Breather ...........................1

Optional:
9031138070................................Oil Seal, Front Shaft............1
4125235020................................Dust Deflector....................1

The seals and plugs cost me about $50 with shipping from Sewell with the CL discount.

As a tip, you'll also need a 12mm hex wrench to loosen the 3 socket head bolts that attach the rear of the diff to the frame. I had to grind down a larger wrench since I didn't have this size handy.
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Old 11-19-13, 12:00 PM   #9
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Congrats on the upgrade, this is the upgrade I miss the most from my old IS250 6MT (R.I.P)
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Old 11-19-13, 08:10 PM   #10
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whoaa....thats insane
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Old 11-20-13, 09:27 AM   #11
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Es808 I plan on getting a LSD for my IS 250 as well (2012 model) and I might just end up getting one that's originally for the IS 300 because I was told that the LSDs for the IS 300 would fit in my model of IS 250? 1) is this true? 2) other than the LSD, do I need anything else like the carrier? (And if i need anything else) I don't know anything about LSD swaps (bought a LSD for my mustang and only needed the LSD, didn't need any kind of carrier). Thanks a lot for your help
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Old 11-20-13, 09:55 PM   #12
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Quote:
Originally Posted by es808 View Post
Internal pic of the IS300 LSD:

I love the traction you get with the LSD and 2 wheel burn outs are awesome! I highly recommend this performance upgrade.
That's a clean *** looking diff internal. You might be the 5th member actually cause I already have one installed lol jk.

How much did you pay for your diff?
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Old 11-20-13, 10:29 PM   #13
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very nice man!!
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Old 11-30-13, 07:02 PM   #14
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Quote:
Originally Posted by 2012IS250 View Post
Es808 I plan on getting a LSD for my IS 250 as well (2012 model) and I might just end up getting one that's originally for the IS 300 because I was told that the LSDs for the IS 300 would fit in my model of IS 250? 1) is this true? 2) other than the LSD, do I need anything else like the carrier? (And if i need anything else) I don't know anything about LSD swaps (bought a LSD for my mustang and only needed the LSD, didn't need any kind of carrier). Thanks a lot for your help
All you'll need is the diff. It will bolt on exactly the same as the OEM diff. These don't have a carrier? I'm not sure about the AWD IS250 but it's 100% bolt on for the RWD. The only thing needed are the plugs and seals listed above.
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Old 11-30-13, 07:05 PM   #15
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Quote:
Originally Posted by topspeed55 View Post
That's a clean *** looking diff internal. You might be the 5th member actually cause I already have one installed lol jk.

How much did you pay for your diff?
The diff I got relatively inexpensive from a craigslist seller in Idaho. All in all I spent around $500 for the parts.
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Old 11-30-13, 07:05 PM
 
 
 
 
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2009, carrier, diff, differential, is250, is300, lsd, rear, removal, remove, rtv, shaft

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