Connection issues
"The quick disconnect lines do not go all the way in to allow the clips to fully seat. They work but it’s not ideal. I hope the lines never pop off."
Cummins
Shop All
Quick Ship
SKU #: PPE-225065000
MPN #: 225065000
PPE Transmission Fluid Bypass Valve 13-18 Ram 6.7L Cummins
Description
Increase the fluid flow to your transmission cooler and add a layer of protection with the PPE Trans Fluid Bypass Valve. The OEM part has restrictive internal passages. When the OEM valve fails in the open position, transmission fluid doesn’t reach your cooler. This can be caused by mechanical failure or debris. The result of stock valve failure can cause the transmission to dangerously overheat. Without properly cooled transmission fluid, the demands of towing and rigorous stop-and-go driving conditions shorten the life of transmission components.
The PPE Bypass eliminates the extremely restrictive mechanical factory valve which maximizes fluid flow from the transmission cooler. For further protection, a Neodymium magnet equipped service plug has been added. The removable plug traps ferrous debris and can be accessed to remove particles from the system. The factory bypass valve does not have this feature.
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.
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.
Blog
June 12, 2026
The diesel particulate filter (DPF) on your Cummins engine traps soot before it leaves the tailpipe. Over...
Read MoreCummins DPF Cleaning: Signs, Methods & Tips
June 12, 2026
P2509 flags when your Cummins ECM isn't seeing stable voltage coming from the battery and charging system....
Read MoreP2509 Cummins Code: Causes, Symptoms & Fixes
June 10, 2026
It starts small. Maybe the truck is a little slower to spool than usual. Maybe it sounds...
Read MoreHow to Find a Boost Leak Without Special Tools
June 05, 2026
Your exhaust system moves spent gases out of the engine and away from the cab. The muffler...
Read MoreResonator vs Muffler: Key Differences Explained
Overall rating: 4.3333335 / 5 from 15 reviews.
AI Generated Review Summary
Summary topics
Review topics: ["looks","issues","idea","temps","plug","o-rings"].
Review highlights
Reviews
Works As Expected
"The bypass works great. Transmission still reaches full operating temp but it take much longer. Also, seems to cool off much faster. Will definitely keep the heat out of your transmission. The inspection plug with magnet is an easy way to check for metal contamination without making a mess. Product is pictured as "Raw Billet" but showed up black. Not really an issue."
Works great and had no
"Works great and had no problems"
Ever since I installed this
"Ever since I installed this part my transmission temperature won't go over 144° with constant towing."
Awesome product!
"Awesome product!"
Looks good
"Front lines were extremely hard to snap in. After I finally got them in now they are leaking. Have to figure out what the problem is."
Love the polished look
"Love the polished look"
Eh, it's not too bad
"I just installed the PPE thermal bypass on my truck and just like Mroan8009's review, I had the same issues. Installation is pretty self explanatory, but the o-rings in the PPE thermal bypass were too thick for the transmission lines to go inside. I ended up having to get new o-rings that were the same size as the factory o-rings because one of the o-rings ripped when I was removing them from the factory part. Yes, I got covered in transmission fluid because I was trying to get the lines back in with the thicker o-rings. I will say it seems like it'll work out well, but installation is a pain when you're expecting a little mess and end up a huge mess and having to replace the o-rings just to get everything put back together."
Awesome bypass valve
"Great product, easy install, dropped trans temperatures 20 degrees. I’ve told everyone to get one"
PPE transmission fluid bypass.
"Saw all the reviews. Was excited to try it out. Sadly. I’ll be removing it and reinstalling the OEM part. Probably not the best idea for warm climates. Guessing the fluid doesn’t have enough time in the cooler to properly cool. Before installing, my trans ran right at 170 to 172f, pulling the heaviest grades with a 12 to 15k pound load in summer, it would get up to maybe 180 to 185f. With the PPE bypass installed. It climbed to 190f just driving on the freeway unloaded. Never have I seen that high of temp ever. So, now I’ll remove it and install the OEM thermostat back in it. Maybe a good idea for cooler climates but not a good idea for the hot so cal deserts. It was 115f ambient when testing. But that said the OEM tstat kept it at 170 to 172 when it was 122f ambient. Sorta bummed. Really liked the part. But guess it’s probably only because we have super hot summers. Part was nice. Well made. Really liked that it had a magnet anne plug. Install was easy. Just not good for my application due to environment."