Originally Posted by T@co_Pr3runn3r
Mine goes thru factory cooler first then goes thru the Hayden then back to tranny. Why would you cool the fluid with cooler then send it thru the factory one to heat it back up before sending it back to the tranny? The Hayden instructions even say leaving it going thru oem first then cooler keeps your factory warranties intact too. You cool it a bit with oem and then the Hayden cools the shit out of it then luke warm fluid goes back to tranny. Agreed on the lower temps extending tranny life fo sho tho. Couldn't hold the return line for more than a few seconds before it started to burn hand before adding Hayden but after adding it you can hold return line all day. Huge difference. Probably more than 40 degree difference between the syn fluid and adding the cooler. And the bigger the cooler the more it'll cool while adding more fluid to the capacity to fill cooler and lines. All good things for the tranny whether towing or not.
The reason it goes into the radiator's heat exchanger in the first place is to heat the fluid when the trans is cold. The viscosity of trans fluid increases as temps go down increasing pressure in the trans which causes harsh shifts. Pressure control is the key to smooth trans operation, thus temp control is essential.
Trans cooler goes before the radiator cooler. Keep your trans opeating properly! If you're working your trans hard enough to the point where a single engine and trans cooler is not enough, you need a bigger truck.
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