Superior STL-5R110W

How the Superior STL-5R110W Pump Upgrade Kit is Integrated in Warren Diesel’s 5R110W Builds

At Warren Diesel Shop, we specialize in building 5R110W TorqShift transmissions for Powerstroke applications (stock -1000+ HP). While our core rebuild kits (Stock+, Competition, Competition+, Full Billet) and fully built units come standard with a high-quality billet pump for maximum strength and durability under extreme torque, many builders and customers in the diesel community—including those following our upgrade paths—incorporate the Superior STL-5R110W Pump Upgrade Kit as a key enhancement for superior cooling and pressure stability.

Here’s how it’s typically used in a Warren Diesel-style 5R110W rebuild:

Why We Recommend It

• The OEM thermal bypass valve is notorious for sticking or melting in hard-worked trucks, restricting cooler flow and causing high temps/overheating.
• The STL-5R110W’s patented Sure-Cool® Flow Control System deletes this problematic valve and provides full-time flow to the external cooler, dramatically lowering average fluid temperatures—critical for heavy towing or high-power builds.
• It includes a high-pressure safety bypass to the lube circuit and allows cold-level ATF checks without the 45-minute warm-up wait.
• The patent-pending advanced PR valve stabilizes line pressure (no more 20-40 PSI gauge bounce), reduces bore wear, and is a true DROP-IN & GO™ / NO-REAM™ install in most cases.