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.
Exterior Components› Body Panels and Components
Whiteline
Whiteline 08+ Subaru WRX Hatch / 08-09 Subaru STi Rear Diff Mount Inserts positive power kit
SKU: W00A KDT903
Easy — 1–2 hours
Overview
Show original supplier description
Part #: KDT903
Whiteline's differential insert bushings work within the voids of the original factory bushing to ensure pinion angles are maintained while delivering an improved gear shift resulting in reduced initial torque loss and greater power transfer to the wheels.
Features:
- Featuring premium anodized alloy materials, Whiteline alloy products are anodized providing a long-lasting protective barrier to corrosion and wear but they look great too.
- Inserts are designed to work with the original factory bushing rather than replacing it.
- Install guide included providing detailed instructions on how to install your new Whiteline purchase.
- Internal grease reservoirs provide continual self lubrication for optimum friction management.
- Protective plating on all metal components acts as a hard skin that is much tougher than conventional paint allowing this product to withstand the toughest conditions and resist corrosion for years to come.
- Protective powder coating acts as a hard skin that is much tougher than conventional paint allowing this product to withstand the toughest conditions and resist corrosion for years to come.
- Specially bonded design for optimised strength typically required in high load bearing applications.
- Supplied with extreme pressure molybdenum disulphide (LM) based grease for extended life.
- Whiteline's latest technology synthetic elastomer formulation boasts resistance to oil, grease, ozone and weathering.
Whiteline Differential - mount in cradle bushing.
Vehicle Symptoms
- Rear end clunk or thud during acceleration or deceleration
- Vague or delayed shift feel in manual transmission
- Drivetrain slop when applying or releasing throttle
- Excessive differential movement under hard cornering
Relevant Conversations
- Subaru rear differential clunk fix
- Whiteline KDT903 differential mount bushings install
- best upgrade for Subaru drivetrain slop
- KDT903 vs factory differential bushing
- reduced torque loss differential mount bushing
- Subaru WRX diff thud acceleration
- Whiteline differential cradle bushing review
- how to install rear diff mount bushings Subaru
- improve shifting feel Subaru differential bushings
- what causes drivetrain clunk when letting off gas Subaru
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 | Whiteline |
| Part Number | W00A KDT903 |
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