Mishimoto Transmission Cooler for Dodge (2010-12) 6.7L Cummins 2500, 3500, 4500 & 5500

Mishimoto’s transmission cooler is designed to be a direct fit for the 2010-2012 Dodge 2500/3500 6.7L Cummins and features a tube and fin design optimal for heavy load towing and rapid load changes. This transmission cooler boasts a 60% increase in core volume and an 86% increase in external fin area for superior cooling and heat dissipation. It also pairs with an optional line kit that helps bypass the factory transmission cooler, as a transmission failure can contaminate that.

Whether you're hauling a heavy trailer through the mountains or crawling over rocks in 4WD low, your truck’s transmission is under constant stress—and that stress generates heat. Lots of it. Left unchecked, heat is one of the fastest ways to wear down a transmission. That’s where a transmission cooler steps in. So, what does a transmission cooler actually do, and why might it be time to consider replacing or upgrading one?

An automatic transmission operates by using hydraulic fluid to transfer power, control gear changes, and lubricate internal components. Every time your truck shifts, tows, climbs, or even just idles in traffic, that fluid heats up. Ideally, it stays within a temperature window around 175°F, but under heavy load, temps can climb fast—often past 225°F or even 250°F. That’s bad news for longevity.

A transmission cooler functions as a dedicated heat exchanger, just like your radiator or intercooler. It works by routing hot ATF (automatic transmission fluid) away from the transmission case and through a set of narrow tubes. Air passing over these tubes pulls away heat, cooling the fluid before it's sent back into the transmission. This closed-loop system helps regulate fluid temperature, keeping it in the safe zone and preventing thermal breakdown.

Like all Mishimoto products, this transmission cooler is backed up by our Lifetime Warranty with Accident Protection for worry-free cooling as long as you own it.

Includes:
(1) Mishimoto Transmission Cooler
(2) Mounting Brackets
(2) Transmission Lines
(4) M6 x 10mm Hex Head Flanged Bolts
(2) M6 x 16mm Hex Head Flanged Bolts
(1) M6 x 20mm Hex Head Flanged Bolts
(2) Worm Gear Clamps
- Mishimoto Lifetime Warranty

Notes:
Core Height: 7.87"
Core Thickness: 1.54"
Core Length: 22.48"
Fluid Capacity: 0.7 qts
FITTING SIZE: 1/2"
INCREASE IN OIL CAPACITY: 0.88 qts

Required Tools:
• Socket Driver
• 10mm Socket
• Flathead Screw Driver
• Pick Tool
• Drill
• 3/4" Drill Bit or Hole Saw
• Trim Clip Removal Tool (Optional)
• Transmission Line Disconnect Tool (Optional)

Install Time:
1 HOUR