Remove Tranny Fluid Bypass?
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Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
Originally Posted by SilverDually
keep the bypass it saved my *** a month ago. i noticed my temps going through the roof to 230 all od a sudden. i call brian at bts he tells me to disconnect the trans cooler and blow air back threw and my cooler was cloged with what was left of the TC clutchs. so what happened the pressure built up to much and the bypass kicked in BUT i lost the cooling but it got me home. then i went to and got myself a BTS trans and a new cooler. and before someone else starts i asked brian about a before cooler trans fluid filter he says bad idea kills the flow rate. so theres my personal experience.
I've got temp senders in both the line pressure test port on the tranny and in the return line from the cooler, so I always know how well the cooler is working by comparing the two temp readings. If the bypass failed open and bypassed all the fluid so that none went through the cooler, I'd see the lower temp on the return line and the higher temp on the tranny port and know that the cooler (or filter) was clogged or that the bypass was failed open. In either case I would have time to take action. If the cooler (or inline filter) clogs and you have no bypass, you'll need a new tranny for sure!
I've been told by the wife that I've got a mind like a steel trap. Stuff goes in there, and can't get out!
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Per a good suggestion by Kwik, I'll be adding a pressure switch in front of my current spin-on BT111 external trans filter to trigger an LED on my instrument panel, set to "make" at around 10 pounds. That's well below the filter's internal bypass (yes, there IS a bypass, at around 20 pounds) and will tell me if the filter's gotten clogged. Since I have a filter first, I should never have a clogged cooler.
If I have a clogged filter, I'm at the end of the trans' service life, anyhow. There's no reason to clog a filter unless something's already let go, like clutches.
In decades of having this kind of trans filter set-up (albeit not on 4R100's), I have yet to have a tranny failure, so I'm not going to change something that might change my luck (which improved considerably after adding filtration to a VERY failure-prone Dodge).
But I AM going to eliminate something that I haven't had before, something that has a failure rate to add to the equation, and something that I apparently have no need to have, given the temperatures in which my truck lives.
Pop
If I have a clogged filter, I'm at the end of the trans' service life, anyhow. There's no reason to clog a filter unless something's already let go, like clutches.
In decades of having this kind of trans filter set-up (albeit not on 4R100's), I have yet to have a tranny failure, so I'm not going to change something that might change my luck (which improved considerably after adding filtration to a VERY failure-prone Dodge).
But I AM going to eliminate something that I haven't had before, something that has a failure rate to add to the equation, and something that I apparently have no need to have, given the temperatures in which my truck lives.
Pop
Last edited by SpringerPop; May 24, 2007 at 11:50 PM.
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
Just for curiosity, have you thought about taking the check valve out and then installing some type of a manual valve in the existing line? thinking along the lines of a small brass ball valve or the like. Might come in handy to manaully allow the fluid to travel back in the even some thing does go awry. Also, there was discussion earlier on about running two coolers in parallel rather than series, what are you thinking there? I have been pondering running another tru cool in parallel and just discarding the existing factory cooler. Mine doesn't have an otw cooler in the rad so that part doesn't even matter.
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Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by cangim
Mine doesn't have an otw cooler in the rad so that part doesn't even matter.
Postmaster
Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
Originally Posted by cangim
I thought you had to install a new rad to have the otw cooler for the tran in it?
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