Which diffs fit an sc300
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10th Gear
Joined: Nov 2021
Posts: 13
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From: MN
Which diffs fit an sc300
I have a 95 sc300. I'm planning on doing a cd009 swap into the car. When I first went about searching up what diff would go well with the trans, I decided I wanted the tt auto diff. But now that I've done more research many people say a 3.76 diff ratio doesn't work well with the cd009 gearing (the first gears are short) and that a lower gearing at around 3.2xx would be better. Please correct me if I'm wrong on this.
Now onto my next question, assuming that a 3.2xx diff ratio is better, which cars can I get a pumpkin from that have the 3.2 ratio and will drop into my sc. I've read that the gs400 has and sc430 pumpkins will drop right it. Which other cars will fit? Does the gs430 fit at all? Am I missing any other ones that will fit? Let me know, thanks!
Now onto my next question, assuming that a 3.2xx diff ratio is better, which cars can I get a pumpkin from that have the 3.2 ratio and will drop into my sc. I've read that the gs400 has and sc430 pumpkins will drop right it. Which other cars will fit? Does the gs430 fit at all? Am I missing any other ones that will fit? Let me know, thanks!
Racer
Joined: Jun 2007
Posts: 1,719
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From: Washington
98-00 SC400, 98-00 GS400, 02-05 SC430.
Pretty certain pumpkins on SC430's will not bolt in, but the ring and pinion for all of those will fit into yours; which makes more sense when you are adding an LSD and need it shimmed anyways.
Pretty certain pumpkins on SC430's will not bolt in, but the ring and pinion for all of those will fit into yours; which makes more sense when you are adding an LSD and need it shimmed anyways.
Thread Starter
10th Gear
Joined: Nov 2021
Posts: 13
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From: MN
also, would the gs430 diffs fit or not?
Last edited by denSC300; Aug 2, 2022 at 09:01 AM.
SC430 diffs will fit. They came in 3.26:1 and 3.76:1 over the production run.
Some of these diffs require swapping over the companion flange from an SC300/400/Soarer. It's a very small difference but the SC/Soarer has a flange with 101mm spacing and many of these other diffs have 111mm spacing. At a glance they look the same but it's significant when attempting to bolt them up.
Requires a 35mm (I think) deep socket and a dial-torque wrench. The TSRM has a procedure to follow to torque it down correctly. You don't want to do too much as it might change the already balanced pinion gear depth as it meshes with the larger ring gear around the diff center.
Here's a master list of what diffs (and even just compatible ring and pinion sets) are compatible with the Supra MKIV, SC300/400, Z30 Soarer, GS300/400, Aristo and SC430/Z40 Soarer chassis.
https://www.supraforums.com/threads/...l-info.608545/
Some of these diffs require swapping over the companion flange from an SC300/400/Soarer. It's a very small difference but the SC/Soarer has a flange with 101mm spacing and many of these other diffs have 111mm spacing. At a glance they look the same but it's significant when attempting to bolt them up.
Requires a 35mm (I think) deep socket and a dial-torque wrench. The TSRM has a procedure to follow to torque it down correctly. You don't want to do too much as it might change the already balanced pinion gear depth as it meshes with the larger ring gear around the diff center.
Here's a master list of what diffs (and even just compatible ring and pinion sets) are compatible with the Supra MKIV, SC300/400, Z30 Soarer, GS300/400, Aristo and SC430/Z40 Soarer chassis.
https://www.supraforums.com/threads/...l-info.608545/
Thread Starter
10th Gear
Joined: Nov 2021
Posts: 13
Likes: 0
From: MN
SC430 diffs will fit. They came in 3.26:1 and 3.76:1 over the production run.
Some of these diffs require swapping over the companion flange from an SC300/400/Soarer. It's a very small difference but the SC/Soarer has a flange with 101mm spacing and many of these other diffs have 111mm spacing. At a glance they look the same but it's significant when attempting to bolt them up.
Requires a 35mm (I think) deep socket and a dial-torque wrench. The TSRM has a procedure to follow to torque it down correctly. You don't want to do too much as it might change the already balanced pinion gear depth as it meshes with the larger ring gear around the diff center.
Here's a master list of what diffs (and even just compatible ring and pinion sets) are compatible with the Supra MKIV, SC300/400, Z30 Soarer, GS300/400, Aristo and SC430/Z40 Soarer chassis.
https://www.supraforums.com/threads/...l-info.608545/
Some of these diffs require swapping over the companion flange from an SC300/400/Soarer. It's a very small difference but the SC/Soarer has a flange with 101mm spacing and many of these other diffs have 111mm spacing. At a glance they look the same but it's significant when attempting to bolt them up.
Requires a 35mm (I think) deep socket and a dial-torque wrench. The TSRM has a procedure to follow to torque it down correctly. You don't want to do too much as it might change the already balanced pinion gear depth as it meshes with the larger ring gear around the diff center.
Here's a master list of what diffs (and even just compatible ring and pinion sets) are compatible with the Supra MKIV, SC300/400, Z30 Soarer, GS300/400, Aristo and SC430/Z40 Soarer chassis.
https://www.supraforums.com/threads/...l-info.608545/
2002-2006 Lexus SC430's have a 3.266:1 rear differential.
2007-2010 Lexus SC430's have a 3.976:1 rear differential
(Note: While the 2000 model year is the last for the SC300/400 there was no 2001 model year of the Lexus SC430 for the U.S.)
2007-2010 Lexus SC430's have a 3.976:1 rear differential
(Note: While the 2000 model year is the last for the SC300/400 there was no 2001 model year of the Lexus SC430 for the U.S.)
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