🔥⚙️ TWISTED STREET DIESEL™ 4L80E TRANSMISSION

350–450 HP HEAVY-DUTY STREET & TOWING BUILD

The Twisted Street Diesel™ 4L80E is built for daily-driven diesel trucks, mild hauling, recreational towing, and lighter RV applications.

This is an updated stock-style build that keeps factory drivability while correcting the common wear and pressure problems found inside the 4L80E.

🔥 POWER & USE

✔ 350–450 Horsepower

✔ Stock and mildly upgraded diesel engines

✔ Daily driving and work-truck use

✔ Mild hauling and recreational towing

✔ Lighter RV and motorhome applications

✔ Smooth, controlled street shifts

Final rating depends on vehicle weight, engine torque, tuning, gearing, and use.

⚙️ COMPLETE STREET DIESEL BUILD

🔧 COMPLETE MASTER OVERHAUL KIT

New gaskets, seals, sealing rings, bonded pistons, bushings, bearings, thrust washers, and wear items.

This restores proper sealing, oil control, and internal clearances.

🔥 PREMIUM HIGH-ENERGY CLUTCHES

Upgraded clutches provide better holding power and handle towing heat better than standard replacement frictions.

🔧 NEW CLUTCH STEELS

Worn, glazed, or heat-damaged steels are replaced to give the new clutches a clean surface to apply against.

🔥 HEAVY-DUTY INTERMEDIATE BAND

A new wide band improves holding power and durability during loaded operation.

🔥 UPDATED 34-ELEMENT INTERMEDIATE SPRAG

The updated sprag is stronger than early factory designs and helps prevent sprag and intermediate clutch failure.

⚙️ TRANSGO SHIFT-CORRECTION KIT

Corrects common shift and pressure problems while keeping the transmission smooth enough for everyday driving.

🔧 UPDATED VALVE BODY — TWISTED TORQUE™ SPEC

The valve body is taken apart, cleaned, inspected, and checked for worn valves and pressure loss.

Worn areas are repaired as needed to improve clutch apply, converter lockup, and shift quality.

🔥 SONNAX UPDATES AS NEEDED

Sonnax valves and sleeves are used where wear is found in the pressure, boost, oil-feed, and converter circuits.

These repairs help prevent low line pressure, clutch slip, and converter lockup problems.

🔧 UPDATED PUMP

The pump is inspected and set up for proper pressure, converter feed, cooler flow, and lubrication.

Hardened pump rings and recommended pump updates improve pressure control and reliability.

🔧 NEW INTERNAL ELECTRONICS

New EPC solenoid, shift solenoids, TCC solenoid, internal wiring harness, and applicable sensors are installed.

This removes old electrical parts that commonly cause pressure, shifting, and converter lockup problems.

🔧 CENTER-SUPPORT UPDATE

The center support and retaining hardware are inspected and updated as needed to prevent movement inside the case.

⚙️ OE-STYLE DIESEL TORQUE CONVERTER INCLUDED

✔ Remanufactured stock-style diesel converter

✔ Heavy-duty lockup clutch

✔ Factory-style diesel stall speed

✔ Smooth engagement and dependable lockup

✔ Matched to the vehicle and engine

This build does not include a billet performance converter. It uses an OE-style diesel converter for stock drivability, mild towing, and daily work-truck use.

🔥 WHY UPGRADE FROM A STOCK REBUILD?

✔ Better clutch holding under diesel torque

✔ Stronger intermediate sprag and band

✔ Improved line-pressure control

✔ More dependable converter lockup

✔ Better cooler and lubrication flow

✔ New internal electronics

✔ Common valve-body wear repaired

✔ Built for mild towing and everyday work

🚗 COMMON APPLICATIONS

✔ Chevrolet and GMC diesel trucks

✔ Chevrolet and GMC diesel vans

✔ 6.2L and 6.5L diesel applications

✔ Hummer H1 diesel applications

✔ Light RV and motorhome applications

✔ Diesel conversions using a GM 4L80E

✔ Two-wheel-drive and four-wheel-drive builds

Every transmission is built to order for the vehicle and intended use.

🚚 SHIPPING

Freight is calculated separately based on destination and delivery requirements.

Residential, liftgate, limited-access, and special-delivery fees may apply.

📞 NEED HELP? LET’S BUILD IT RIGHT

📞 833-858-9612

🌐 TwistedTorque.com

BUILT FOR TORQUE. BUILT FOR WORK. BUILT TWISTED.