Warren Diesel 5R110w Pump Rebuild Upgrade Kit

Warren Diesel Billet 5R110W Pump Rebuild & Upgrade Kit

Stop babying your transmission and start driving it like you mean it. The stock 5R110W pump is one of the first things to give up when you start pushing power, towing heavy, or running aggressive tuning — and once it goes, it takes the rest of your transmission down with it. Our billet pump rebuild/upgrade kit is built to fix that for good.

What’s In It

Billet gear machined from 4140 steel and heat treated to 70 Rockwell, Sonnax TCC control valve sleeve, steel regulator valve from superior valve kits, non-blowout seal, and Durabond front bushing. This kit is designed as a full rebuild-and-upgrade solution — not just a patch job. It addresses the known wear points and design shortcomings of the OEM pump so you’re not reinstalling the same weak link.

Full-Time Converter Cooling — Why It Matters

One of the biggest upgrades built into this kit is full-time cooling flow to the torque converter, and it’s a game changer for a few reasons:

• No more heat spikes under load. The stock pump routes cooling flow in a way that can starve the converter during certain conditions (towing, hard acceleration, stacked tuning). Full-time cooling keeps fluid moving through the cooler circuit constantly, so heat doesn’t build up and cook your fluid.
• Longer fluid and clutch life. Transmission fluid breaks down fast once it gets too hot, and heat is the #1 killer of clutches and bands. Consistent cooling flow means your fluid stays in spec longer and your internals age a lot slower.
• More consistent converter lockup and shift feel. When the converter isn’t fighting temperature swings, lockup behavior and shift quality stay more predictable, especially under load or in stop-and-go towing situations.
• Better protection for modified trucks. If you’re running higher line pressure, aftermarket tuning, or towing near max capacity, heat is the enemy. Full-time cooling gives your transmission the thermal margin it needs to survive the extra stress.

Built for Real-World Abuse

Whether you’re towing, sled pulling, or just tired of babying an automatic that can’t handle your power level, this pump kit is built to give your 5R110W the durability the factory unit was never designed to have.