Lexus/FRS differential pumpkin swap: Y31 casing - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

sfruski · 08-10-2018, 07:09 PM

I have and extra differential pumpkin from what I believe is an IS250. The pumpkin is labeled Y31, which I can't find any information on. It is an open differential.

I am going to be swapping in a Kaaz lsd and a 4.67 ring and pinion. I don't want to spend a bunch of money just to find out they carrier won't fit or the axles won't go in. The Greddy differential cover bolts up to the back of it.

Everything looks the same as the FRS pumpkin, but does anyone know for sure? Will it bolt up and will the axles go in?

Thanks.

fika84 · 08-10-2018, 07:29 PM

if it's out of an is250 then you should be good to go from what I've seen. I used one from an is300, but everything that I researched said it could've been from an is250 or is300.

It also looks identical to the one from the is300 i put in and our stock one that I took out.

Here is one link that I found quickly..
https://www.clublexus.com/forums/per...automatic.html

sfruski · 09-10-2018, 01:19 AM

Just FYI for someone in the future. The axels do fit into the housing. Now it's time to test a 4.67 rear end with FI an kazz lsd.

Weasel Soup · 09-10-2018, 11:49 PM

Interesting. I’ve got a Kaaz lsd in my RallyCross Escort. Super modification, one of the best I’ve done to that car. But, that car went from open differential to the “1.5” way unit.

I’m interested to see what you think after the mods.

FRSBRZGT86FAN · 09-11-2018, 03:16 AM

Quote:

Originally Posted by fika84

if it's out of an is250 then you should be good to go from what I've seen. I used one from an is300, but everything that I researched said it could've been from an is250 or is300.

It also looks identical to the one from the is300 i put in and our stock one that I took out.

Here is one link that I found quickly..
https://www.clublexus.com/forums/per...automatic.html

Quote:

Originally Posted by sfruski

Just FYI for someone in the future. The axels do fit into the housing. Now it's time to test a 4.67 rear end with FI an kazz lsd.

So is the general synopsis that Y30 or Y31 both work?

sfruski · 09-11-2018, 12:33 PM

I'm not sure what the Y30 is out of, but the Y31 works for sure. If the 30/31 are swappable, I would assume the 30 would be good as well.

08-10-2018, 07:09 PM	#1
sfruski Member Join Date: Feb 2017 Drives: Many Location: San Francisco Posts: 85 Thanks: 2 Thanked 33 Times in 18 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Lexus/FRS differential pumpkin swap: Y31 casing I have and extra differential pumpkin from what I believe is an IS250. The pumpkin is labeled Y31, which I can't find any information on. It is an open differential. I am going to be swapping in a Kaaz lsd and a 4.67 ring and pinion. I don't want to spend a bunch of money just to find out they carrier won't fit or the axles won't go in. The Greddy differential cover bolts up to the back of it. Everything looks the same as the FRS pumpkin, but does anyone know for sure? Will it bolt up and will the axles go in? Thanks. Attached Images

09-10-2018, 11:49 PM	#4
Weasel Soup Veteran RallyCrosser Join Date: Apr 2014 Drives: 10 Series FR-S, 95 Escort Rally Car Location: Colorado Posts: 202 Thanks: 82 Thanked 92 Times in 46 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Interesting. I’ve got a Kaaz lsd in my RallyCross Escort. Super modification, one of the best I’ve done to that car. But, that car went from open differential to the “1.5” way unit. I’m interested to see what you think after the mods. __________________ Everything should be attempted twice. Once to satisfy curiosity, and the second time to see if you like it. My Journal 2016 SCCA RallyCross National Champion - Prepared Rear Wheel Drive

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sfruski Member Join Date: Feb 2017 Drives: Many Location: San Francisco Posts: 85 Thanks: 2 Thanked 33 Times in 18 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Just FYI for someone in the future. The axels do fit into the housing. Now it's time to test a 4.67 rear end with FI an kazz lsd.

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sfruski Member Join Date: Feb 2017 Drives: Many Location: San Francisco Posts: 85 Thanks: 2 Thanked 33 Times in 18 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I'm not sure what the Y30 is out of, but the Y31 works for sure. If the 30/31 are swappable, I would assume the 30 would be good as well.

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