4R100….rebuild AGAIN or replace….
Lead Driver
Joined: Aug 2022
Posts: 5,063
Likes: 1,414
From: Oologah, OK
There may or may not be a benefit to keeping the in-radiator portion of the trans cooler when upgrading to the 6.0 style external trans cooler.
Personally if I were running a v10 / 4r100, I’d bypass the in-radiator cooler when putting on the monster 6.0 trans cooler. I can’t imagine the BTU capacity of the huge 6.0 cooler not being significantly larger by itself than the stock in-radiator and tiny external trans coolers the gassers / 7.3L diesel got.
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Personally if I were running a v10 / 4r100, I’d bypass the in-radiator cooler when putting on the monster 6.0 trans cooler. I can’t imagine the BTU capacity of the huge 6.0 cooler not being significantly larger by itself than the stock in-radiator and tiny external trans coolers the gassers / 7.3L diesel got.
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I can prove that it has NOT been detrimental to the transmission, as it is running Cooler than before this was done.
This is with a brand new Murray Radiator, Water Pump, and the 6.0 ATF cooler was brand new when this photo was snapped.
I towed this trailer from Price, Utah to Dawsonville, GA and the TFT never reached 200*, the trailer was loaded with a lot of heavy iron, Farm equipment,
( discs, turning plows, harrows, a 5th wheel attachment for the 99 Dodge RAM flatbed, and a monster Gun Safe, plus a Koenig tool box taller than the trailer and loaded with tools.
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
Likes: 761
From: Houston, Texas
I'd start by using a different builder and interviewing them. BTS is ultimately the best choice but there's a waiting list. (Two members on this thread know this first hand) If you need the truck back, there's a guy near me that does bench jobs. Meaning, he builds it, you install it. He's done mine and 3 others and no one has had any issues. I was the guinea pig for everyone else's so he perfected the art of building a bulletproof 4R100. I can get you in touch with him.
I'd recommend flushing the lines and replacing the 6.0 trans cooler you have. The other issue you're having seems to be that no one has installed a Magnetic filter in line to keep metal from destroying the transmission. This first happened to me February 2006 when mine went out. The Ford tech didn't install a magnetic filter and Ford had to replace my transmission again on their dime. I've since kept that filter inline (I change it every service) and that transmission lasted 15 years and 413,000 miles. The only reason I had to have it rebuilt again was because the torque converter blew up and sent Lisa Frank through my transmission.
I'd recommend flushing the lines and replacing the 6.0 trans cooler you have. The other issue you're having seems to be that no one has installed a Magnetic filter in line to keep metal from destroying the transmission. This first happened to me February 2006 when mine went out. The Ford tech didn't install a magnetic filter and Ford had to replace my transmission again on their dime. I've since kept that filter inline (I change it every service) and that transmission lasted 15 years and 413,000 miles. The only reason I had to have it rebuilt again was because the torque converter blew up and sent Lisa Frank through my transmission.
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rowekmr
Clutch, Transmission, Differential, Axle & Transfer Case
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Mar 31, 2008 11:36 PM
