Best upgrade
"Installed the ppe transmission cooler on my lb7 and right away I noticed a difference in how cooler the transmission was running. bout 30° cooler then before pulling a loaded 28 ft enclosed trailer."
Cummins
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SKU #: PPE-124060000
MPN #: 124060000
PPE Performance Transmission Cooler for 01-10 Duramax LB7/LLY/LBZ/LMM
Description
You must select your truck's model year from the options below.
Keep your transmission cool with PPE's performance transmission cooler. Lower your transmission operating temperature with this bolt on replacement. 60% increase in heat rejection surface lowers temperatures 20-30 degrees. This easy installation only takes about 30 minutes.
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
IMPORTANT NOTES:
- 124060000 2001-03 Cooler - connectors with Orange Clips
- 124060300 2003-05 Cooler - connectors with Purple Clips
- 124062000 2006-2010 Cooler - connectors same all years
About PPE (Pacific Performance Eng.)
Browse PPE Diesel Parts Online by Make, Model, and Year.
Originally founded in 1985, Pacific Performance Engineering (PPE) is leading the way in the progression of diesel performance. Their roots started them in the diesel performance industry installing other manufacturers kits and components, which led to the release of their original product, the Duramaximizer, in 2001 to improve upon the power and efficiency of the LB7 Duramax, and is still in use today. Today, they are known for manufacturing dual CP3 kits, their line of Xcelerator programmers for numerous applications, upgraded oil pans, and nearly anything you can think of to improve the power and extend the life of your Duramax, Cummins or Powerstroke.
Video
DIESEL TALK | PPE PERFORMANCE TRANSMISSION COOLER!
Keep your transmission running cool and protected with PPE’s Performance Transmission Cooler. This direct bolt-on replacement is designed to dramatically reduce transmission operating temperatures, helping extend the life and performance of your drivetrain. With a 60% increase in heat rejection surface area, this cooler can lower temps by 20–30 degrees, even under heavy use. Best of all, installation is quick and painless, most installs take around 30 minutes with basic tools.
Features:
Bolt-on replacement for factory cooler
60% increase in heat rejection surface area
Reduces transmission temperatures by 20–30°F
Quick and easy install (about 30 minutes)
Fitment:
2001–2003 Duramax
2003–2005 Duramax
2006–2010 Duramax
A must-have upgrade for towing, hauling, or pushing your Duramax harder than stock.
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Overall rating: 4.3333335 / 5 from 24 reviews.
AI Generated Review Summary
This PPE performance transmission cooler is designed for 01-10 Duramax LB7/LLY/LBZ/LMM trucks, offering a 60% increase in heat rejection surface to lower transmission temperatures by 20-30 degrees. Customers report an easy installation process, taking about 30 minutes, and a noticeable difference in transmission temperatures compared to stock coolers.
Summary topics
- Installation Ease: 25%
- Temperature Difference: 17%
Review topics: ["quality","difference","install","shipping","cooler","truck","buy","bolt","upgrade"].
Review highlights
- "Easy install good quality part does the job" —
- "Easy install and setup with my existing -10n fittings." —
- "Easy install and I can totally see a drop in temps." —
Reviews
"BEST COOLER EVER. I put this on my LBZ. It made a world of difference from my stock unit."
"Fit perfect, great part highly recommend this upgrade."
Awesome Product
"Easy installation on my 2010 Duramax. Keeps trans temp cooler!"
Excellent quality
"Far exceeds stock cooler. Increased cooling, better design and nicer appearance."
Quality product
"Item was packaged very well, bolted right into place. No leaks and looks great! (Can’t comment on performance bc my truck already had a cooler and it was damaged trying to replace the lines)."
Performance wise it is keeping
"Performance wise it is keeping my motor cool, However, it leaks at the lower connection and can’t get it to stop leaking. Mechanic has been working on it however he won’t guarantee the work because he didn’t buy the parts. Not sure what I should do next?"
F**king amazing does everything it
"F**king amazing does everything it says it does trans is happy so am I"
Keepin it cool
"Think this is gonna do alot to keep things cool. Great piece"
Missing bolts
"Great trans cooler just missing bolts and no instructions and had to get the a/n fitting for my upgraded lines"
Q&A
- How do I know if I need orange or purple clips? Neither clip on my truck now is those colors
- If yours is a 2001-2003, you would use the orange, if 2003-2005 you would use the purple clips. The 2006-2010 are all the same.
- What size are the connector threads? I have aftermarket AN lines so I would have to buy new connector fittings to go from thread to AN.
- The adapters are 7/8" - 14.
- Are these fittings on this cooler threaded in or soldered in?
- The connectors are threaded in.
- Got an O6 Allison with the stage 5 PPE kit. Would this be enough, or should I go bigger?
- That should be plenty depending on how much hp you have. If your temps start to get hotter then you would like maybe look at adding an Aux cooler under the truck with a fan.
- My cooler lines is a 3/4 inch line. Will this cooler be able to fit those lines?
- This would fit the factory 5/8 lines. Sounds like you might have aftermarket lines. Some of those kits have fitment issues with the direct replacement coolers. -Sands