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SunCoast Category 5 4R100 Transmission (NO Converter)

Pricing: $9,900.00

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Refundable Core Charge: $1,200.00



  • Alto High Performance Clutch Kit
  • Alto High Performance Steel Module
  • Overhaul Kit
  • New Filter
  • New Bushing Kit
  • Transgo Tugger Kit
  • New Solenoid Pack
  • New Heavy Duty 45 Element Sprag
  • New High Performance Carbon Fiber Intermediate Band
  • Billet Aeromet Input Shaft
  • Billet Forward Clutch Drum
  • Larger Billet Intermediate Shaft Kit
  • Billet Overdrive Planet
  • Billet Output Shaft

The Category 5

The SunCoast Full Billet Competition Category 5 4R100 transmission has everything listed in our Category 4 4R100 transmission with the addition of our Larger Billet intermediate shaft, Billet output shaft, Aeromet billet input shaft, and a billet over drive planet.

The 4R Platform

The 4R100 transmission replaced the E40D transmission for the 1999 year model and was mated to the 7.3L Power Stroke diesel through the 2003 model year Ford trucks. The 4R100 proved to be a fairly reliable transmission in stock performance levels, however once power adders are introduced the transmission, becomes the weak link in the drivetrain.

This electronically controlled overdriven unit boast a first gear ratio of 2.71:1 and a second of 1.54:1, which makes it great for towing and hauling with an .71, overdrive fuel economy is also improved.

The Clutch Kit

This new 4R100 transmission includes Alto Red Eagle clutches along with Kolene steels.

Red Eagle Friction is the go-to material for most performance applications. The lining has a unique dual-saturation, which imparts high friction coefficients and high heat resistance. Red Eagle clutches are designed to limit the amount of "slip" by providing a shorter lock-up time, generating less heat.

The proprietary process starts with the friction paper saturated in a phenolic resin, cured, and then saturated a second time in a silicate. The silicate imparts high heat resistance.

Red Eagle clutches:

  • Are designed with a softer, more resilient base paper.
  • Assure less wear against opposing steel plates.
  • Reduce the incidence of steel plates burning and warping.

The Intermediate Sprag

The factory sprag in the 4R100 transmission unit is notorious for failing when exposed to high levels of fatigue. This could include vehicles exposed to heavy towing or hauling or just higher-than-normal torsional fatigue. These factory sprags are typically 24- or 34-element sprags. In all SunCoast builds, these are replaced with heavy duty 45 element sprags. This is an increase of up to 53% over the factory, offering unmatched performance and ensuring that premature failure does not occur.

Transgo Valve Body Calibration Kit

The valve body is the central nervous system of your transmission. Everything that transpires within the unit begins here. In our SunCoast builds, we exclusively use the TransGo HD2 Tugger Kit. This valve body calibration kit is perfect for exhaust braking and doubles the low clutch holding pressure in manual first gear for reliable downhill braking. You also have the ability to adjust shift firmness to your desired preferences. With the improved converter feed capacity, you benefit with better cooling and lubrication.


  • Codes 628, P1740, P1744
  • Soft shifts
  • 2nd and 3rd burn-up
  • Converter burn-up
  • Reverse delay
  • No reverse hot
  • Converter slide/shudder
  • Pump buzz

Also Includes:

  • Pressure regulator boost valve
  • 1-2 shift valve spring
  • Line regulator valve
  • Innovative line-to-lube components
  • High temp direct clutch seal
  • Coast clutch HD snap ring
  • OD housing spiral lock snap ring
  • Updated direct clutch outer seal
  • Calibration plate for firmness adjustments
  • Quick-fill valve
  • L/R mod boost valve

New Solenoid Pack

The 4R100 is equipped with a solenoid pack that controls shifting from gear to gear. This solenoid pack is comprised of electromagnetic solenoids. The integrity of these solenoids is imperative, as the flow rate and spray pattern could affect shift quality and clutch life. When failure occurs within the unit, it is not uncommon that the same particles and sediments you find in the bottom of the pan are also in the solenoids. This contamination of the solenoids can and will affect the fluid delivery to critical circuits within the unit.

In this SunCoast 4R100 transmission we replace the solenoid pack with a new one to ensure consistent shifts and long clutch life.

New Bushing Kit

As with any standard rebuild, this 4R100 transmission also includes a new bushing kit, which also includes a new front pump bushing.

Intermediate Band

This SunCoast Category 4R100 transmission also includes a new carbon fiber band. This band is used in manual second gear and during downshift engine braking. The carbon fiber material in this band is made to withstand a much higher heat range versus the factory material.

Upgraded Aeromet Input Shaft

The input shaft on the 4R platform has always been the first weak link to bear its head once additional horsepower is applied. In this transmission we upgrade the input shaft to Aeromet 100 alloy. The Aeromet material resist torsional fatigue much better than other materials commonly used.

The Forward Drum Upgrade

The Ford 4R100 forward drum has been a sore spot for many 4R100 owners for quite a few years. These issues date back to the earlier C-6 and E40D platforms with repeated spline failures and snap ring blow outs. In this SunCoast Category 4R100 Transmission the factory forward drum is replaced with a new billet one. The 4R100 billet forward drum is manufactured from 4140 heat treated stress relieved billet steel. This new drum corrects and eliminates the common issues with spline failure and snap ring blow outs.

Upgraded Larger Billet Intermediate Shaft

The Intermediate shaft, also called the center shaft, is the second weakest hard part within the 4R100 Transmission next to the input shaft. In this Category 5 4R100 transmission, we upgrade this shaft to much larger billet one.

This new much larger billet intermediate shaft is manufactured from 4140 HTSR billet steel and incorporates a dual bushing support system for increased stability over the OE design. This is the largest intermediate shaft available on the market today. This shaft bolt over a 20% increase in overall diameter. The forward drum comes with both cast and teflon sealing rings.

Billet Overdrive Planetary Housing

In high horsepower applications it is not uncommon to see the overdrive planet housing break, this is especially true during instances of rapid loading and unloading of the suspension. In this Suncoast 4R100 Category 5 transmission we replace the factory planetary assembly with a billet overdrive planetary housing to prevent failure. Pinion staking pins are supplied, no welding required.

Billet Output Shaft

The factory output shaft is the last weak link in the 4R100 transmission when building a high performance unit. These shafts are mostly prone to torsional fatigue breaks but it is not uncommon to see higher horsepower units cause sheer breakage. To alleviate this issue Suncoast replaces it with a billet output shaft manufactured from 300M material for unmatched strength and performance.



Shipping Information

  • Item Requires Shipping
  • 270.0 lbs.
  • W48.0000” x H40.0000” x L31.0000”

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