Thermal Bypass on Trans.
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Senior User
Joined: May 2008
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From: Pleasant Lake, IN
Thermal Bypass on Trans.
I know this has probably been covered a million times, but I couldn't find a definite answer in the "search", I found a place selling the tru-cool trans coolers (4739 Max) and they have two options, one with an external thermal bypass, and the other says for warm climates (not me), with NO thermal bypass, From what I understand the trans. on these '99 and newer rigs with the 4R100, have that kind of bypass already built in to the trans. so I would NOT need another external one. Is that right? Just tryin' to make sure weather or not it's needed. Talk to y'all later...
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
Get the one with "NO" thermal bypass, as the transmission has one already. It is in the line that connects between the fluid inlet and outlet ports on the right side of the transmission.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
The 4R100 does not have a thermal bypass. It has a pressure bypass. It is designed to bypass the cooler if the cooler plugs. It can plug from debris, or from REALLY cold ATF. Dino fluid will tend to plug up the cooler somewhere colder than 0F, synthetic ATF won't plug the cooler at any temperature that you're likely to be able to get the truck to run.
I'd install a cooler WITH a thermal bypass.
I'd install a cooler WITH a thermal bypass.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Good to know
The 4R100 does not have a thermal bypass. It has a pressure bypass. It is designed to bypass the cooler if the cooler plugs. It can plug from debris, or from REALLY cold ATF. Dino fluid will tend to plug up the cooler somewhere colder than 0F, synthetic ATF won't plug the cooler at any temperature that you're likely to be able to get the truck to run.
I'd install a cooler WITH a thermal bypass.
I'd install a cooler WITH a thermal bypass.
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
I don't think it matters, as long as it is in the line from the trans to the first cooler. Mount it where it's convenient.
Thread Starter
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Senior User
Joined: May 2008
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From: Pleasant Lake, IN
The 4R100 does not have a thermal bypass. It has a pressure bypass. It is designed to bypass the cooler if the cooler plugs. It can plug from debris, or from REALLY cold ATF. Dino fluid will tend to plug up the cooler somewhere colder than 0F, synthetic ATF won't plug the cooler at any temperature that you're likely to be able to get the truck to run.
I'd install a cooler WITH a thermal bypass.
I'd install a cooler WITH a thermal bypass.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
O.K. Mark, I totaly believe what you're saying. However, I stumbled acrost this site... Tru-Cool 4739 MAX with the opposite info. (about 1/2 way down the page) I would think that they MUST be misinformed also about the factory trans. pressure valve. or am I missing something? Any thoughts?
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Senior User
Joined: May 2008
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From: Pleasant Lake, IN
No, I've seen his credentials, like I said in my post, I totaly believe HIM, I was simply wondering if that web-site somehow knew something that I didn't, or if it was simply "cut and dry"... if the truck has a 4R100 trans. this IS HOW IT IS! Sometimes build dates of the same yr. OR different option packages will affect what one guys rig has on it vs. what another guys has. Did that make sense? I'm rereading it but it doesn't look like it's coming out right?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
However, I stumbled acrost this site... Tru-Cool 4739 MAX with the opposite info. (about 1/2 way down the page) I would think that they MUST be misinformed also about the factory trans. pressure valve.
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