auto trans possable issues
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
No, that's not right. The stock coolers do not have any type of thermostat from the factory. They flow ATF anytime the engine is running.
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Senior User
Joined: Dec 2007
Posts: 384
Likes: 0
From: North wales , PA and nj
than why was the trans temp rising after 2 miles. and now the trans temp is staying normal after the cooler was piggybacked to the stock one?
Senior User
Joined: Sep 2006
Posts: 276
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From: Linden, VA
Ok, so you had an aftermarket cooler flying solo and it got hotter? If so, that is weird and I don't understand why it would happen that way but I am 99.9% sure that the stock oil cooler is just a bent up pipe with fins. No magic.
The only reason to put a thermostat in an oil cooler loop would be to heat the trans. I am not aware of any manufacturer that would do that.
I could be wrong, just ask my wife.
The only reason to put a thermostat in an oil cooler loop would be to heat the trans. I am not aware of any manufacturer that would do that.
I could be wrong, just ask my wife.
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Senior User
Joined: Dec 2007
Posts: 384
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From: North wales , PA and nj
I'm not sure y. My tranny guy said if it has a thermostat inside that would make sense. If not it would send trans fluid through the torque converter at a high rate and alow it to start to heat up.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
That doesn't make any sense. There is no thermostat anywhere in your trans unless someone added one after the truck was built.
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Senior User
Joined: Dec 2007
Posts: 384
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From: North wales , PA and nj
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Senior User
Joined: Dec 2007
Posts: 384
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From: North wales , PA and nj
yes im 99.9% sure it is a 4R100 i just dont understand why it would have heating issues with a larger than need brand new cooler. Than works fine when useing both
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