Login
My Account
My Cart
The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
Enter your truck info so we can recommend the right products for you.
Can't find it? Call us at 859-737-4966 for free advice.
Menu
Air Filters
Air Intakes
Clutches
Cooling System
Drive Line
Electronics
Engine
Engine Parts
Exhaust
Exhaust Brakes
Fabrication Components
Fluids
Fuel Systems
Fuel Tanks
Gauges
Injection Pumps
Injectors & Related Items
Intake Manifolds
Intercoolers
Lift Pumps
Programmers
Silicone Hoses
Suspension
Tools
Transmissions
Turbochargers
Water Meth Inj Kits
Thoroughbred Diesel has been your online performance headquarters since 2002. We know how to get the most performance out of your pickup truck and offer all of today's most popular diesel performance products.
Brakes
ECM
Electrical Components
Engine Components
Exterior Replacement Parts
Filters
Fuel Pumps
Gaskets & Seals
Interior Replacement Parts
Oil Pumps
Starters & Alternators
Thoroughbred Diesel offers OEM and diesel stock parts for your diesel pickup truck. At Thoroughbred Diesel, you can buy stock diesel replacement parts such as injectors, fuel pumps, ball joints, track bars, turbos, and more for your diesel truck.
Injection Pump
Injector
Turbo Charger
Batteries
Bed Covers
Bumpers
Fender Flares
Floor Mats and Liners
Grilles
Horns
Lighting
Mud Flaps
Nerf Bars
Running Boards
Seats & Covers
Shift Knobs
Spare Tire Carriers
Storage
Tailgate Nets
Tool Box
Truck Steps
Ventvisors
Wheels
Winches
Make heads turn with custom truck accessories from Thoroughbred Diesel.
Ball Mounts
Gooseneck & Fifth Wheel
Hitch Balls
Hitch Pins & Hitch Locks
Hitch Steps
Hitches
Loading Ramps
Shackles & Tow Hooks
Tow Brakes
Tow Mirrors
Towing Accessories
Weight Distributing Hitchs
Banners
Decals
Hats
Hoodies
License Plates
Shirts
Tank Tops
Show your support with a Thoroughbred Diesel t-shirt, sweatshirt, or sticker decal.
Thoroughbred Sku #: SUNSC-46RHCAT2-8993-4WD-LC-CRE
Year/Make/Model: {{year}} {{make.Name}} {{model.Name}} Edit
$6,100.00
Terms & Conditions for Cores
Many stock replacement parts such as turbos, injectors, injection pumps, and high pressure oil pumps have a core charge that is associated with the new replacement part. You must return the old part to receive a refund on the core charge.
If you plan on returning your core you have two options.
Thoroughbred Diesel offers defer the upfront core charge when purchasing via credit card payment.
OPTION 1: You can accept the core charge, which means you will be charged for the part AND the core at time of purchase. You still have the option to send it back, and if you do, the core will be refunded back on the card used, presuming the core meets core criteria and the core is returned within 30 days from the time your order is received. If you return your core after 30 days you may refer to the Core Charge Timeline below as to how you will be refunded.
Core Charge Timeline
OPTION 2: You can defer the core charge. If you defer, you will not be charged for the core at the time of purchase. You will have 21 days from the time your order is received to send the core back. If the core is not received within the 21 days, your credit card will be charged for the core amount on your order. If you return your core after 21 days, you may refer to the Core Charge Timeline below as to how you will be refunded. When Core deferral (Pay Core Charge Later) is limited to payment by credit card only. ***When using PayPal or Affirm as your method of payment “Core Deferral (Pay Core Charge Later)” is not available. The core must be paid at time of purchase. ***
Core Return Procedure
1989 - 1993 Dodge D250
1989 - 1993 Dodge D350
1989 - 1993 Dodge W250
1989 - 1993 Dodge W350
Product Name: Suncoast 46RH CAT 2 500 HP TRANSMISSION 1989-1993 4WD (WITHOUT CONVERTER) Manufacturer: Suncoast Manufacturer Part #: SC-46RHCAT2-8993-4WD-LC Thoroughbred Diesel Part #: SUNSC-46RHCAT2-8993-4WD-LC Fitment Notes: 1989-1993 Dodge Diesel
For over two decades SunCoast has continually led the the industry in both innovation and performance. Dating back to the days of Redneck nationals and Team Green before outlaw racing was even thought of SunCoast transmissions were breaking records and winning world championships. The phrase "copied but never caught" could never be truer than now.
Each one of our Dodge Torqueflite transmissions receive what we call our base packages. This base package can be built and improved upon with a plethora of options and upgrades to suit your individual needs. These units are not "cookie cutter" units but rather something individually catered to your specific needs. Each one of our calibrations to the valve body, pump, seperator plate, and even the clutch stack-ups are meant with your intended usage in mind. These units include have many upgrades from the factory not just for performance but restoring hydraulic integrity to some very crucial circuts, Here are some listen below:
The Billet Band Package
The Torqueflight transmission utilizes a band to shift the transmission into 2nd gear, then this band is release when shifting into 3rd gear. This band is wraps around the direct drum (right behind the transmission pump)this drum house the direct clutches (3rd gear). When thinking about the amount of torque these trucks can make coupled with the torque multiplication of the converter and it soon becomes apparent why this area could be problematic. The band itself from the factory is a very flexible band, these band will stretch and require constant adjustment. When even modest attempts of increased apply pressure occur these band break due to the flimsy construction. You will some aftermarket attempt to use a very rigid material to keep these from flexing or breaking. SunCoast took a different approach and just redesigned the band all together. Each one of our units recieves a new SunCoast custom billet band machined in house. This new SunCoast billet band is also lined with a Carbon Fiber friction material offering the best friction coefficent available.
Our next focus is with the hydraulic integrity of this band acuation. The best band in the world is useless without proper clamping force when apply and a quick release off the drum when needed. This is where our SunCoast billet 2nd gear servo comes into play. The factory uses a cast servo, the servo offers two simple o'rings to help control cross-leaking within the bore. This bore over time will wear, as it wears cross leaking occurs causing lazy shifts, slips going into 2nd gear, and of course in some events bind-ups and dragging of the band going into 3rd. SunCoast corrects this by installing a custom cnc'd billet intermediate servo. This servo is made with 4 sealing rings both teflon and rubber, That is double what the factory uses. This servo is also larger in apply area, over 20% larger than the factory. This larger apply surface area allows for not only a dramatic increase in apply pressure giving you an enormous amount of clamping load, but this also allows for a faster shift time. As almost everyone in our industry lust over the additional clamping force and much quicker apply time, we often overlook the release of the band. The release of the band can be just as import if not more. When they drag on release it can cause bind-up issues, scoring of the band material, and of course premature wear. SunCoast also modifies the length of this servo to achieve much crisper shifting.
Now that we have increased the clamping force we must address the two other problematic issues with the band strut and the band anchor. Just as an engine builder would change to a stronger chrome moly push rod when changing the camshaft to ensure no deflection occurs the same can be said for the band strut and band anchor. With now having a more apply pressure on the band we must correct or issue with the factory band strut as well. SunCoast replace the factory band strut with a much stronger billet band strut to keep any deflection at bay. The band anchor is also replaced with a billet one as well.
Throwing out the garbage
The factory, through all of the engineering they have done somehow thought it would be a good idea to put a plastic accumalator piston in this unit. We are still left scratching our head everytime we see a broken one. These very inexpensive plastic pistons will in fact break over time. This is not a matter of if but when this will happen. When you couple this with the fact that this piston also has issues with cross leaking within the bore, It only make sense that it belongs in the trash. Here at SunCoast we manufacture our own new piston that has additional sealing rings to fix this issue. This accumalator piston is also designed with annular grooves to keep side loading from transpiring.
Deflecting the blame
Deflection can occur in many ways, in engineering deflection is the degree to which a structural element is displaced under a load. When we start talking about loads under hydraulic apply priciples and deflection is always around us.
In both the direct and forward drum we see deflection and side loading contribute to repeated failures daily. At SunCoast we have addressed the issue with the direct drum by making several improvements. The factory cast piston has several key issues we felt we needed to address. On every one of our Competition transmissions we simply replace the factory direct drum with a full billet one. While this is very costly we felt it neccassary despite the cost. This upgrade is not needed for mildly modded vehicles and we can resolve the key issues by simply replacing the factory piston. Here they key issues with this piston and how we address it:
Each one of our builds receives new custom billet direct and forward apply pistons. We are proud say that both the forward and direct pistons are designed, engineered, tested, and manufactured here in the U.S.A. by American workers.
The Valve Body
In many way the valve body is the brain of the transmission. This one simple piece can simply be the life or death of a transmission. Each one of our SunCoast custom built transmission's receive one of our custom calibrated valve bodies. SunCoast has specifically calibrates each valve body for that customers specific needs. We also offer a variety of additional upgrades to these as well. We offer full manual setup's in both forward and reverse shift patterns. These can also be built with custom transbrake's as well.
Suncoast Transmission Features: