Couple questions. Tranny has been heating up rather quickly when driving.

I let it idle for about an hour or so this morning in 70*+/- ambient temp. My tranny got up to about 140*+/-

But I was hitting 190-220* fairly quickly with no load within 10 miles. Did a drain, filter and installing a 8 pass aux cooler to replace the 2 pass stock one.

My question is should I leave the rad cooler in line or bypass the rad cooler? Does anyone have tranny temps to support their setup?


Thanks,

BTW I have a full ZF swap with Southbend that I will be installing Just not looking t start now! Lazy

 

*IF* the radiator cooler is not plugged it should stay in the circuit. It is a very efficient cooler. If you remove it you will lose a lot of cooling capacity, which is not what you want to do.

 

That's is kinda what I was thinking.

FU question: On a moderate ambient temp day say 90-95* what type of temp rise should I see in the tranny fluid? Assuming I have no load and am not racing around.

Just to give me an idea for comparison!


Thanks,
Again

 

Trans fluid will run about 60-100°F above ambient temperature.

 

Make 100% sure the fan is working. Coolers rely on air movement.

 

Well my truck barely will off the cold mark so I am pretty sure the fan is good.

I put the cooler on with the rad in line still heats up. Tried without the rad in line still heats up. So I ripped it all out to do the ZF swap . I have no patience. Any body need an new 8 pass tranny cooler? $50 from O'riely used 1 hour $35

I have the stock cooler
8 pass
tranny lines in good shape
auto tranny harness
and a E40d that will need something(probably a soft rebuild, pump? and TQ Converter?)

If any body is interested.