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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-20-2009, 12:07 PM   #1 (permalink)
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trans bypass tube

What are the cons of deleting the warm up or bypass tube on the transmission? And is there a kit to do it I saw where someone just smashed the tube closed but I want it done right. And also what is the advantage?
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Old 11-20-2009, 12:26 PM   #2 (permalink)
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The purpose of the tube is to provide lubrication to some parts in the back of the trans should the flow thru the cooler become restricted. So the con would be burning up your trans if the flow thru the cooler gets restricted. The only advantage I can think of is the elimination of a part that could fail. There isn't much in there to fail, just a ball and spring.
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Old 11-20-2009, 12:36 PM   #3 (permalink)
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It's not there to help warm the trans. In fact it doesn't work for that at all. It only bypasses when the coolers are restricted.

Pro of blocking it: None
Con: Failed trans
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Old 11-20-2009, 01:25 PM   #4 (permalink)
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Thanks for clearing that up, but if there is a ball and spring in there if that gets froze up will the return line from the cooler that connects to the back end of that tube not let ATF flow back into the tranny or is the ball and spring on the upper end? should I be taking that tube off and making sure those arent messed up I don't want to end up goin through another tranny.
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Old 11-20-2009, 10:30 PM   #5 (permalink)
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Its rare but the check valve does fail. If your worried about it ride down to ford and pick up a new one. Cheap insurance.
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Old 11-21-2009, 05:00 AM   #6 (permalink)
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If the ball and spring fail fluid will bypass the cooler and keep the trans lubricated.
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Old 11-21-2009, 08:19 AM   #7 (permalink)
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If the ball and spring fail fluid will bypass the cooler and keep the trans lubricated.
Yes, but the fluid will not cool.
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Old 11-21-2009, 12:32 PM   #8 (permalink)
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Trans Bypass Tube

What advantage are you looking for by removing the bypass tube?
This is designed to protect your tranny in the event of a clogged / failed due to blockage ATF Cooler.
A replacement online will cost about 50 bucks but will be higher at the Dealer.
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Old 11-21-2009, 05:14 PM   #9 (permalink)
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Yes, but the fluid will not cool.
That's true, but it is better than the alternative. Without the bypass the trans doesn't get lube and it dies.
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Old 11-21-2009, 06:03 PM   #10 (permalink)
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That's true, but it is better than the alternative. Without the bypass the trans doesn't get lube and it dies.
Which would result in ur temping reading hot? and then you replacing the bypass tube and maybe the fluid instead of the trans toasting before you have any clue? right?
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Old 11-22-2009, 07:14 AM   #11 (permalink)
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Right! That's MUCH better than replacing the trans.
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Old 11-22-2009, 09:18 AM   #12 (permalink)
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That's true, but it is better than the alternative. Without the bypass the trans doesn't get lube and it dies.
I never told him to get rid of it. I suggested buying a new one if he was worried about the old one.
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Old 11-22-2009, 01:04 PM   #13 (permalink)
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Thanks for clearing that up, but if there is a ball and spring in there if that gets froze up will the return line from the cooler that connects to the back end of that tube not let ATF flow back into the tranny or is the ball and spring on the upper end? should I be taking that tube off and making sure those arent messed up I don't want to end up goin through another tranny.
If you decide to look at it, and you do a good job of looking, you will discover that there is two ball and spring valves. One of them is in the rear banjo bolt. This one has nothing to do with the fluid bypassing the cooler. The other one is in the tube that connects between the front and rear banjo bolts. This is the one that opens to let the fluid bypass the cooler.
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Old 11-22-2009, 09:06 PM   #14 (permalink)
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I guess i will have to take it off and check it out when I change the fluid thanks for the info.
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