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Legendary 5R110 Heavy Duty Transmission

5R110 Ford 6.0L and 6.4L Heavy Duty Transmission
Your Cost:
From $3,399.00 to $4,599.00
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REQUIRED INFO: There is a Core Charge on this item. If you send a core in first, your fee will be waived. If you send your core later, you will be charged a refundable $1200 core charge. Choose One:*

Product Description

Valued Customer:

At this time, due to material shortages, DIESELSITE is not adding to our current build queue.  As such, we will not be issuing out quotes or estimates or shipping new units until we deem a time when transmission building can resume. 
We apologize for the inconvenience.


Engineered to Last

  • Heavy Duty 5R110 for the Ford 6.0L and 6.4L Powerstroke
  • Designed for demanding conditions
  • Improved Performance at Affordable Pricing
  • Eliminates sloppy shifting
  • Transmissions usually in stock and ready to ship - short lead times if not
  • Short Lead Times on custom builds
  • Each Unit 100% Dyno Tested – NO DOAs
  • Built in the USA

2003 -2007 Ford 5R110 F250 - F550 and Excursion 6.0L Heavy Duty Diesel Transmissions:
2008-2010 Ford 5R110 F250-F550 6.4L Heavy Duty Diesel Transmissions:

 PTO OPTIONS: Please note: If you have a PTO transmission, you must call to order. You cannot interchange them with non-PTO units.

  Several years in the making.
After purchasing Factory Tech Transmissions in April of 2012, we spent the last couple years setting up the lathes and mills to cut special parts, installing blast cabinets, paint booths, and our state of the art $250,000 dynamometer powered by BlueReach Automation. We can duplicate actual driving and load conditions in a truck, including all upshifts and downshifts.


  • Designed for towing performance.
  • Increased power transfer to the rear wheels
  • Improved shift feel
  • More durable than OEM.
  • Clutch material designed to handle extended and elevated temperatures without burning.

Standard Specifications in every transmission:

  • Direct and Forward clutches built with 130% of OEM clutch surface area.
  • Coast Clutch upgraded with increased clutch surface area, and custom spiral snap ring.

Coast Clutch Assembly Shown with Optional Billet Forward Planetary Assembly

  • Overdrive built with 133% of OEM clutch surface area to hold up to towing in OD.
  • Intermediate clutches (3rd gear) built with 170% of OEM clutch surface area.
  • Pump modified for increased fluid pressure
The 5R110 was introduced into production on mid 2003 model year trucks. The transmission went through many changes until it went out of production in 2011. Many of these changes were for increased durability. Using the wrong parts can cause damage or at the very least suffer durability. Do you know what you are buying when you purchase a 5R110? Or a better question would be, does your builder know what he's building with when he assembles a 5R110 for your truck? If you have a 2007, and you buy a transmission from your builder, is he sending you hard parts from a 2003 model? Most all builders sites make no mention of differences between 2003-2010 models. What are you getting??

All Dieselsite Legendary Transmissions get all the latest heavy duty parts regardless of what year you had or what year transmission you sent in.

In 2003-2004 models, Ford used what was left of a large amount of 4R110 ring gears and planetary assemblies. As you can see in the photos, there is a large difference in the heavier duty parts used in the 2005 models.

In 2003-2004 5R110 models, the Low Reverse ring gear hub had holes machined into it to cut weight in the finished unit. This proved to be a fatal flaw as these ring gears hubs broke under stock hp levels. Ford upgraded the hub to solid steel in 2005 which remedied this issue. While we sell an upgraded billet Low Reverse hub, ALL Dieselsite Legendary Transmissions are built with the solid steel hub. Is your builder re-using these parts?

Below is another example of the left over 4R100 parts used in the 2003-2004 5R110 models. The sun gear shown was made for the 4R100 which had a bushing. It had an oil slot machined in it to allow oil to pass behind the bushing. This was found to cause oil starvation to other circuits which reduced the durability of the transmission. In 2005, a new sun gear was machined to eliminate this oil slot as no bushing is used in this location on a 5R110. All Dieselsite Legendary Transmissions receive this upgraded sun gear.

The Next photo illustrates the changes made in the pan/filter in the 2008 model years. We use the newer 08.5-2010 upgraded pan and filter on all of our 5R110 Legendary transmissions. This also allows you to remove the factory external filter if yours was equipped with one. We offer this "delete" kit if you wish to just purchase it as a solution.

  • All plastic sensor port dummy plugs replaced with machined aluminum o-ring style plugs to prevent failure.
  • Every single clutch pack is measured and set to exact clearances- every unit within .003"
  • Torrington bearings throughout.
  • High Energy 850° frictions in all forward gears (including overdrive) - no 5R110 has ever had this. A DieselSite exclusive!
  • Every remanufactured part is run through our de-burring machine.

  • New Output Speed Sensor
  • New Transmission Speed Sensor

  • We have a transmission hydraulic circuit pressure test machine to insure no internal leakage occurs.

  • Every Unit fully tested in our own Transmission Dynamometer - No DOA units leave here!
  • ......Many more modifications we do to improve performance and reliability

  Shipping based on your location. If you need liftgate service, you will need to specify this and be aware that there is a 100.00 additional charge for this service - each time the lift gate is needed. If you need a lift gate for delivery and pick-up, the additional shipping cost will be 200.00. We will handle all the shipping arrangements getting the transmission to you in a shipping container and arrange the pick-up of your core when you are ready. So, this shipping cost is all inclusive (other than liftgate if needed) to cover shipping to you and the shipping to get the core back to us.

Core Charge. The transmission is shipped to you in a molded shipping container. We must get this case back with your transmission core. If you send back your core without the case, you will only get $1000.00 of your core fee returned. The case has a $200.00 core fee on it. If you ordered a TC and do not send your tc core back with your transmission, there will be another $150.00 deducted.

Options for custom builds include:

  • MagHytec Deep Transmission Pan
  • 300M Advanced Alloy Billet Input Shaft
  • 300M Advanced Alloy Billet Intermediate Shaft
  • 300M Advanced Alloy Billet Forward Planetary Assembly