For more information on Diesel Site call us at 1-86.New banjo bolts with no spring and check ball to allow 100% fluid flow.Comes with the bushings to eliminate the bypass tube.A common misconception is that this tube is used to control transmission fluid temperature, i.e. Will not work on E-Series 4R100 Cooler Bypass.ĭieselSite 4100 Transmission Cooler Bypass Kit Features: If you look on the Ford truck enthusiast forums, there’s a great deal of discussion regarding the cooler bypass tube and the integral pressure relief valve. Where you live makes a crucial impact on transmission cooling When you first start your truck in the morning, the transmission uses the heat provided by the engine to warm the transmission. Once the bypass tube is deleted, this check ball and spring are no longer needed. If installing a cooler, ask yourself what plans you have for the cooler during the winter months. The spring and check ball was designed to allow the proper function of the cooler bypass tube. If you look at the cut away photo of the banjo bolt, you can see the spring and check ball which restricts about 75% of the fluid flow to the cooler. Has been used mostly for city/suburban driving. However, these kits do not address the restriction in the banjo bolt. I have a 1999 AvalonXLS, with 60,000 miles. Many delete kits are available on the market that eliminates the bypass tube and the common failure. Another design flaw is even when operating perfectly, the bypass never fully closes, meaning not all fluid is ever sent to the cooler, ever. Unfortunately, these bypass tubes commonly fail preventing transmission fluid flow to the cooler. The bypassing of the cooler was supposed to happen until the fluid reached operating temps. The only way to get fluid into the transmission is filling at the dipstick tube. With the engine idling and in PARK, check the level on the dip stick.
Run the engine, shift into D, N, and R for a few seconds. Add 1 1/2 gallon of fluid back into the transmission. Product Name: DieselSite 4100 Transmission Cooler Bypass Kitįitment Notes: 1999-2003 Ford 7.3L 4R100 Transmissionsįrom 1999-2003 the Ford 7.3L Automatic Transmission (4R100) had an external cooler bypass tube that redirected transmission fluid from the pump output back to the return line of the transmission. Reconnect the cooler line to the transmission.
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