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No, I'm not towing with it, but I do drive in hot climates, in traffic, and transmission oil meets an early death, starting at 225F.
I put the largest Hayden on there I thought would comfortably fit, the 679, and after a few weeks, took the Fakestream out for some temperature measurin'.
Ambient was 102F, I'd just driven home 26 miles on 80-90 MPH freeway, then about 10 minutes on surface streets.
Other readings are also about 10-12F lower, and I'm pleased there is at least a 10F cushion on engine temp vs. transmission temp. Because of the in-radiator cooler, trans temp will never be lower than engine temperature, after the engine is warm, unless there is an external radiator.
It's not like a cooler is going to keep transmission oil at ambient...just not going to happen.
I even sprayed the cooler with water from a garden hose for about three minutes, never got below 162F, and that was in "P", when the converter isn't doing much of anything.
Normally adding a cooler with its internal passages drops the pressure inside the trans. A million years ago we would increase the trans pressure to restore it to the previous levels after installing a cooler
Caflashbob, I can't understand how a post-radiator cooler could lower pressure, as the transmission's pump pulls from the pan, which is at -0- PSI of pressure.
There's very likely more restriction in the aftermarket cooler, so, if anything, pressure would increase, though only post-converter, which does us no good.
Wait.
"A million years ago"?! Hey! I'm about to crank up the line pressures in a Mopar 46RE (a 727 Torqueflite with an overdrive literally bolted to the tail) which is in my '98 Grand Cherokee 5.9, because I want tire-chirping 1-2 and 2-3 gear changes when at full chat.
In fact, I'd crank up the line pressure a little in the AA80E, if I could figure out how to do so. I don't like slushy shifting. Shifts should be crisp and firm, though not harsh. Clutches last longer that way.
Not a yoda tech but 6 years in the trans industry and cooling flow returned is **typically** just used as coolant and lube for critical areas. Line pressure powers drums and pistons and although line pressure may in fact be cooling line pressure, a cooler inducing pressure drop is not a factor as return line is a series of controlled leaks each just enough to keep the bearing, bushing, gear set alive.
My 2007 flows from the passenger side of the radiator and exits on the driver's side. I just flushed my whole system using this method. I would think all 460s would be this way but I could be wrong since your saying otherwise. My 400 and 430 were the same way.
My 2007 flows from the passenger side of the radiator and exits on the driver's side. I just flushed my whole system using this method. I would think all 460s would be this way but I could be wrong since your saying otherwise. My 400 and 430 were the same way.
I’m about to flush my 2014, did you connect a hose onto the fitting or used the existing hose, once removed from the fitting?
Originally Posted by mckellyb
Wow.
I know mine flows port to starboard because I recently changed the fluid and just put in the cooler.
I'm going to have to check, next time I'm under there...
06-27-18, 09:05 AM
Installed a large transmission cooler
