DieselSite External Transmission Filter Kit for 2003-2007 Dodge 47RE/48RE Transmissions

DieselSite kits are made with stainless braided high pressure hose and fittings that match the OEM connections. This allows for easier installation and quick removal should the need arise. There is no cutting or modifying needed of the OEM lines or connections when installing the unit.

Automatic transmissions have internal filters designed to capture only large particles. These filters are designed as a pickup to keep large particles from flowing through the transmission. These filters are on the suction side of the pump. Fine filtration in the pan is not an option for the transmission manufacturers due to the fact that transmission pumps should not be restricted. The only way to get fine filtration for a transmission is with an external transmission filter kit on the push side of the pump. The 4R100/E4OD and many other transmissions were never equipped with this type of external filter.  The Allison in the Chevy and many medium Duty and heavy Duty trucks come equipped from the factory with an external transmission filter. This is not a new idea in transmission maintenance and protection. 

The OEM filter location requires that you pull the pan to change or check the filter. With this kit you can simply spin on a new filter element. With the optional pressure gauge to monitor when you should change your filter, you can avoid unnecessary filter changes.

How it works:

The filter is on the "push" side of the pump. This location allows for a filter with increased efficiency -- or smaller micron rating. Normally, dirty fluid is in the pan, and we assume the OEM filter catches the really big particles before it enters the valves and pump. After running through the transmission, it leaves as "dirty" fluid. This fluid will have clutch dust and other impurities which are all normal in any automatic transmission. This dirty fluid would be recirculated back to the pan. With this kit you can catch dirty fluid BEFORE it makes it back to the pan. Keeping the fluid clean, keeps your valve body clean which keeps your transmission shift quality at its highest. After installation of the external kit the filter in the pan now acts simply as a pickup for the pump and virtually never needs changed.

The unit has a bypass valve in the housing as an added safety feature. This internal bypass valve in the housing is set at 25 psi to allow some fluid to bypass the filter should the filter become restricted. In addition, if the filter becomes plugged, this unit will go into complete bypass mode and allow the full volume of fluid flow to bypass the filter and insure that your transmission always has returning fluid for lubrication. With normal routine oil and filter changes and a properly operating transmission the full bypass mode should never occur. The filters have a micron rating of 22 microns. That is extremely fine filtration for a transmission. Pan filters have no real micron rating. Many are nothing but screens.

The kit also acts as a "mini" cooler since it is detached from the transmission and the air flow over the filter element would help to dissipate a small amount of heat.

Benefits:

• Protects your transmission in the case of a torque converter failure by catching the debris before it can make it back to the transmission. Before the installation of the Factory Tech Monsterbox, we personally lost 3 torque converters in one transmission and the transmission was still in perfect condition.
• No need to drop the pan again for messy filter changes. Your OEM filter will only require changing every 100,000 miles or so.
• The fluid in pan stays clean, protecting the transmission from debris.
• The filter canister acts as a small transmission cooler.
• The bypass valve design allows fluid flow even if the filter plugs with debris.
• Allows the addition of a transmission filter pressure gauge to monitor the condition of the filter.
• The spin on filter replacements are less expensive than the OEM style.

Frequently Asked Questions:

Question:  Will the installation of the DIESELSITE External Transmission Filter Kit cause any increase in flow restriction or loss of flow volume to the return into the transmission?

Answer: No. We built this unit with flow ratings specifically in mind. We tested them with clean and dirty filters and there was still more than the required flow specified by Ford. The required amount is 32 oz. in 15 seconds. The filter unit flowed over 32 oz. in less than 10 seconds - even with TWO Tru-Cool aftermarket transmission coolers installed inline. Even fully plugged, the kit will allow full fluid flow.  You will never be without returning fluid to the transmission.

Question:  What makes this unit better than other transmission filters?

Answer: We have the only full flow system on the market with a built in bypass valve. This insures that should the filter plug with debris, fluid will still return to the transmission. A filter housing with a bypass valve is NOT the same as a bypass filter.   A bypass filter typically "samples" the fluid and filters only a small amount on each pass. As the filter gets dirtier, less will get sampled and more unfiltered oil returns to the pan. The unit -- a housing with a bypass valve-- filters ALL the fluid on every pass when the filter is clean. Only when the filter becomes very dirty does it enter "bypass mode".  At that point it will act as a "sampling" type filter similar to the bypass filter.  

In short, if the filter is clean, all oil is returned to the pan clean. This benefit will most likely save a transmission should you lose a torque converter causing a large amount of debris to be sent downline. In this case, a "sampling" type unit will only catch a very small amount of the debris. The unit will catch it all! The unit also has the ability to add a transmission filter pressure gauge to monitor the condition of the filter.

Another point to mention about the differences between a bypass filter and the bypass valve is that a bypass filter cannot be monitored by any gauge.  So, a dirty filter with no filtration capability remaining can actually never be detected.  Your only option is to change the filter at regular intervals and hope that it does not plug and go unnoticed.  

Another type of unit that we have seen being sold is a full flow unit WITHOUT a bypass valve.  These are the most common aftermarket kits because of cost factors.  These are also the most dangerous to be running.  When the filters are plugged, there is NO return fluid flow to the transmission and no way to allow for it.  Because is has no bypass valve you cannot monitor the filter's condition. You run a high risk of burning up the transmission from a dirty filter.

Lastly, the simple installation with OEM style connectors requires no cutting of your lines.

Question:  What is the micron rating of the OEM unit and why is yours a 22 micron element?

Answer: There isn't a rating on the OEM filter. If you had to rate it, according to Baldwin, it would be about 100 microns. It's basically a screen. 22 microns is smaller than the smallest clearance in the transmission. We could definitely put a smaller micron filter on the housing, but the result would be less oil actually filtered in each pass as more fluid would pass through the bypass port because of increased resistance to flow through the filter. Because the 22 micron element was small enough to keep the system clean and allow all the fluid to be filtered in a single pass, it was the perfect choice.

Note: Dodge kits will not use the pressure gauge addon as you will not be able to read pressure if not in gear.