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From 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. The bypassing of the cooler was supposed to happen until the fluid reached operating temps. Unfortunately, these bypass tubes commonly fail preventing transmission fluid flow to the cooler. Another design flaw is even when operating perfectly, the bypass never fully closes, meaning not all fluid is ever sent to the cooler, ever.
The result: transmission overheat. Many delete kits are available on the market that eliminates the bypass tube and the common failure. However, these kits do not address the restriction in the banjo bolt. 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. The spring and check ball was designed to allow the proper function of the cooler bypass tube. Once the bypass tube is deleted, this check ball and spring are no longer needed.
- Will NOT work on E-Series 4R100's.
- WILL work on gasoline truck application 4R100's.
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using this product does the bypass tube remain on the transmission the BD 1600036 says it eliminates the bypass tube?
The Dieselsite cooler bypass delete for the 4R100 comes with the bushings to eliminate the bypass tube, but also with new banjo bolts with no spring and check ball to allow 100% fluid flow to the cooler.
installing this by-pass kit does the bypass tube stay in place or is it removed ??
The Dieselsite cooler bypass delete for the 4R100 comes with the bushings to eliminate the bypass tube.
he expected drop in TFT's. My TFT's consistently run about 195 to 200 degrees while pulling my camper. I do pull in overdrive when I can keep my rpm's above 1750 and speed at or above 63. Transmission seems to stay the coolest there and temps greatly increase once I go to drive from overdrive. I only use cruise when on flat ground. Otherwise use foot feed throttle.?
If everything is functioning like it should, you are not going to have a massive drop in TFT's. Maybe 5-10 degrees from the slight increase in fluid flow, i would also look at upgrading your transmission cooler to a larger capacity one. DppSands
Will this bypass delete work on a 2000 Ford F-250 with the 4R100 and 5.4L 2V engine??
Yes, just won't work on the Van applications. -Sands