⚙️ Twisted Pro™ Big Block E4OD Performance Transmission

500 HP Rated | Ford Big-Block / 385-Series Pattern

Ford E4OD • 1989–1998

351M • 400 • 370 • 429 • 460 • 385-Series Based Builds

Heavy Towing • Hauling • Work Trucks • RV / Motorhome • Modified Big-Block Applications

The Twisted Pro™ Big Block E4OD is our heavy-duty 500 HP build for Ford big-block-pattern gas applications.

The Pro steps up from our Street build with increased forward and direct clutch capacity, a 45-element intermediate sprag, new overdrive sprag, later-design pump, and the TransGo 4R100-HD2 Tugger valve-body setup.

This build is for heavier trucks, regular towing and hauling, RV and motorhome applications, and modified big-block combinations that need more holding capacity than the Street build.

Rated up to 500 HP.

🔧 TWISTED PRO™ INTERNAL BUILD

✔️ Performance High-Energy Frictions

New high-energy performance friction plates throughout.

✔️ New Steels

New steel plates throughout.

✔️ Increased Forward Clutch Capacity

Forward clutch is set up for increased capacity over the stock configuration.

✔️ Increased Direct Clutch Capacity

Direct clutch is set up for additional holding capacity under load.

✔️ Heavy-Duty Intermediate Band

New heavy-duty intermediate band.

✔️ Heavy-Duty 45-Element Intermediate Sprag

The intermediate one-way clutch is upgraded to a 45-element sprag for increased holding capacity under load.

✔️ NEW Overdrive Sprag

New overdrive one-way clutch / sprag assembly.

✔️ New Bushing Set

New bushings installed during the rebuild.

✔️ Bearings & Thrust Washers

Bearings and thrust washers are inspected and replaced as required.

✔️ New Transmission Filter

⚙️ TRANSGO TUGGER TOW / HAUL VALVE BODY

✔️ TransGo 4R100-HD2 Tugger Reprogramming Kit

The Big Block Pro uses the TransGo 4R100-HD2 Tugger, built for E4OD / 4R100 applications that regularly tow, haul and work under load.

The Tugger includes:

✔️ Pressure regulator boost valve

✔️ Line regulator valve

✔️ Quick-fill valve

✔️ Low / reverse modulator boost valve

✔️ Line-to-lube update

✔️ Increased converter feed

✔️ High-temperature direct clutch seal

✔️ Updated direct clutch sealing

✔️ Heavy-duty coast-clutch snap ring

✔️ OD housing spiral-lock snap ring

✔️ Adjustable shift firmness

The valve body is cleaned, checked and set up for positive shifts under load without making a tow truck or motorhome unnecessarily harsh to drive.

✔️ Increased Manual-Low Holding Pressure

The Tugger increases low-clutch holding pressure in manual first for better holding power and engine braking when pulling a load downhill.

⚡ E4OD SOLENOID PACK

✔️ Solenoid Pack Inspected & Tested

The correct E4OD solenoid pack is matched to the year and transmission configuration.

Solenoid operation is checked during the build. Failed or out-of-spec units are replaced.

Early and late E4OD solenoid packs are different, so the correct pack is used for the transmission being built.

🔩 PRO CENTER SUPPORT & CLUTCH FEED UPDATES

The Pro gets the center-support and clutch-feed areas addressed during the build.

✔️ Center Support Checked for Wear

✔️ Case Lugs Checked at Center Support

✔️ Center Support Sealing Updates

✔️ Intermediate Clutch Feed Sealing Updates

✔️ Direct Clutch Feed Sealing Updates

✔️ One-Piece Rear Case Bushing Where Applicable

✔️ Rear Planet Endplay Checked & Corrected

✔️ Applicable E4OD Updates Installed

These areas are corrected before the increased-capacity clutch packs are installed and set up.

⚙️ PRO REMANUFACTURED E4OD PUMP

The Pro does not use the early low-output E9/F1 pump configuration.

✔️ Later-Design E4OD Pump

Later F5/F8-style pump assembly used for the Pro build.

✔️ Pump Body Inspected

✔️ Stator Support Inspected

✔️ New Pump Bushing

✔️ Pump Gears Inspected

✔️ Worn Pump Gears Replaced

✔️ Pump Clearances Reset to Specification

✔️ Pressure Regulator Updated

✔️ Converter Feed Updates

✔️ Line-to-Lube Updates

✔️ Front Lube / Drainback Updates

The pump is torn down, checked and set up before installation.

🔩 HARD PART INSPECTION

Every reusable hard part is cleaned and checked before assembly.

We inspect:

✔️ Forward Drum

✔️ Direct Drum

✔️ Coast Clutch Drum

✔️ Center Support

✔️ Input Shaft

✔️ Intermediate Shaft

✔️ Output Shaft

✔️ Forward Planetary

✔️ Overdrive Planetary

✔️ Reverse Planetary

✔️ Sun Gear & Shell

Anything worn, cracked, damaged or out of specification is replaced.

🚙 HEAVY-DUTY BIG-BLOCK CONVERTER INCLUDED

✔️ Heavy-Duty Tow / Performance Lockup Converter

The Pro includes a heavy-duty lockup converter matched to the actual engine and vehicle combination.

Converter setup is based on:

• Engine
• Horsepower
• Vehicle weight
• Rear gear
• Tire size
• Towing load
• Intended use

A factory 7.5L / 460 tow truck and a modified 429 or stroker 460 do not automatically use the same converter.

We match the converter to the application.

❄️ HIGHLY RECOMMENDED DEEP ALUMINUM PAN UPGRADE

For big-block towing, hauling, RV, motorhome and modified applications, we HIGHLY RECOMMEND upgrading to our:

🔥 High-Capacity Deep Aluminum Cooling Pan

✔️ Adds approximately 5–7.5 quarts of fluid capacity

✔️ Finned cast-aluminum construction

✔️ Magnetic drain plug

✔️ Temperature-sender port where applicable

✔️ Additional fluid capacity for better heat control

Exact pan and added capacity vary by application.

OPTIONAL UPGRADE. NOT INCLUDED.

🧊 COOLER REQUIREMENT

For towing, hauling, RV, motorhome and regular heavy-load use:

A PROPERLY SIZED AUXILIARY TRANSMISSION COOLER IS REQUIRED.

The cooler and cooler lines must be flushed and checked for unrestricted flow before installation.

If the previous transmission put metal or clutch material into the cooling system, replace the contaminated cooler.

A transmission-temperature gauge is strongly recommended for RVs, motorhomes and trucks that regularly tow.

🛠️ BIG-BLOCK / 385-SERIES APPLICATIONS

This transmission uses the Ford big-block / 385-series E4OD bellhousing pattern.

Factory Replacement Applications

Primarily Ford vehicles originally equipped with the:

7.5L / 460 EFI

Including applicable:

• F-250
• F-350
• F-Super Duty / Chassis Cab
• E-Series
• RV & Motorhome Chassis
• Work / Utility Trucks

🔧 CONVERSION & PERFORMANCE APPLICATIONS

The big-block-pattern E4OD can also be built for compatible:

• 351M
• 400 / 400M
• 370
• 429
• 460
• 385-Series-Based Stroker Engines