STILLEN 2003-2009 Nissan 350Z [Z33] / 2003-2008 Infiniti G35 Transmission Cooler Kit - 400639

Protect your automatic transmission and extend its life with the STILLEN Transmission Cooler Kit for the Nissan 350Z (Z33) and Infiniti G35 (2003–2008). Heat is one of the biggest enemies of an automatic transmission—high temperatures can cause fluid breakdown, reduced lubrication, and increased wear on transmission components. By adding this high-performance cooler, you can maintain optimal transmission fluid temperatures under street, spirited driving, or track conditions.

This complete kit increases transmission fluid capacity, reduces heat buildup, and prevents overheating for smoother, more reliable shifting. Designed for bolt-on installation, it comes with everything you need—cooler, bracket assembly, hoses, fittings, and hardware—making installation straightforward.

Whether you drive aggressively, tow, or frequently hit the track, this STILLEN transmission cooler is engineered to improve the longevity and performance of your Nissan 350Z or Infiniti G35 automatic transmission.

Features & Benefits

• Increases Transmission Fluid Capacity – More fluid volume means better cooling and durability
• Reduces Transmission Fluid Temperature – Prevents overheating and fluid viscosity breakdown
• Extends Transmission Life – Protects internal components during street and high-performance use
• Complete Kit – Includes cooler, bracket assembly, hoses, fittings, and hardware
• Bolt-On Installation – Simple installation with instructions provided
• Street & Track Ready – Suitable for daily driving, spirited street driving, and track use

Specifications

• Fitment: 2003–2009 Nissan 350Z (Z33) / 2003–2008 Infiniti G35
• Components Included: Transmission cooler, bracket assembly, hose kit, fittings, and hardware
• Installation: Bolt-on, instructions supplied
• Application: Automatic transmission only

Vehicle Fitment

• 2003–2009 Nissan 350Z [Z33] (Automatic Transmission)
• 2003–2008 Infiniti G35 (Automatic Transmission)