Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Drivetrain› Differentials and Rear-End Components
OS Giken
OS Giken Lexus IS350 GSE21 (TCD) Super Lock LSD
SKU: O002 TY391-HC
Advanced — 4+ hours
Overview
Show original supplier description
Part #: TY391-HC
Vehicle Symptoms
- One wheel spinning on hard acceleration
- Poor traction when launching or cornering
- Uneven tire wear from open differential
- Difficulty putting power down in wet or loose conditions
- Rear end feels loose or unpredictable under throttle
Relevant Conversations
- IS350 GSE21 limited slip differential upgrade
- OS Giken Super Lock LSD review Lexus
- Best LSD for Lexus IS350 track car
- One wheel spin on launch how to fix
- OS Giken vs Quaife vs OEM LSD
- TY391-HC differential install Lexus
- Limited slip diff for drift build IS350
- Improve traction on IS350 RWD
- Open diff vs LSD handling difference
- OS Giken TCD LSD pressure ring design
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | OS Giken |
| Part Number | O002 TY391-HC |
Videos
About MOTORMIA
Buy with Confidence
Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return PolicyShipping
Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
View Full Shipping Policy