Built for F-250, F-350, F-450, and F-550. Our Monster E4OD, 4R100, 5R110 TorqShift, and 6R140 builds tackle heat, slip, and work-day abuse—so your truck stays earning.
Ford HD trucks live in the red—plows, trailers, service bodies, campers, and job-site heat. We add clutch capacity, recalibrate hydraulics, and match torque converters to your use case. Expect cooler temps, predictable lock-up, and shifts that hold under load.
For OBS and early Super Duty trucks. We address OD clutch burn, EPC wear, and lube control so tow/haul performance stays consistent.
The 7.3L staple. Added clutch area and optimized line-rise keep temps down when the trailer and grades get serious.
For 6.0/6.4 Power Stroke torque. We fight converter distress and thermal fade with better hydraulics and targeted clutch upgrades.
For 6.7L diesel and 6.2L gas Super Duty. Our updates center on clutch durability, lock-up stability, and heat management under real load.
Use the quick guide below, then confirm by tag or VIN. If you’ve changed tires/gears, recalibrate with our Speedometer Calculator.
| Transmission | Common Engines | Typical Trucks | Approx. Years |
|---|---|---|---|
| E4OD | 7.3L IDI, 7.5L V8, 5.8/5.0 Gas | F-250, F-350 (pre-Super Duty) | ~1989–1997 |
| 4R100 | 7.3L Power Stroke; 5.4/6.8 Gas | F-250, F-350; some F-450/F-550 early chassis-cab | ~1998–2003 |
| 5R110 TorqShift | 6.0L & 6.4L Power Stroke | F-250, F-350, F-450, F-550 | ~2003.5–2010 |
| 6R140 | 6.7L Power Stroke; 6.2L Gas | F-250, F-350, F-450, F-550 | ~2011–2019 |
Fleet-ready parts, dyno-verified performance, and support from builders who live Ford HD.
Capacity increases, improved lubrication, and calibrated line-rise so shifts stay crisp on grades and job sites.
Single-disc tow units to multi-disc performance options. We spec stall and lock-up for your combo.
Every unit completes a multi-point test cycle before shipping. Install with confidence.
Talk to specialists who build these transmissions daily—get the right solution the first time.
Industry-leading options protect your investment—work, tow, or play.
Streamlined logistics and a straightforward core return process to minimize downtime.
Answers for F-250 through F-550 owners and fleet managers.
Yes. Larger rolling diameter and gear changes alter load and shift scheduling. Recalibrate your speedometer/strategy; our Speedometer Calculator is a great starting point.
Follow our install sheet. Typical guidance: gentle cycling through all gears, avoid full-load launches initially, and perform an early fluid/filter check to verify level and cleanliness.
No—tow ratings are set by the manufacturer. Our builds improve durability and shift quality so the truck performs more consistently at its rated capacity.
StreetMonster suits stock/near-stock work trucks and daily use. SportMonster is best for frequent towing or mild tuning. TrackMonster targets heavy power, commercial duty, or competition scenarios.