Deleting the heat exchanger, 48re

Gibson

Gibson

There's no love in diesel
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Oct 11, 2008
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Got a kid that comes the shop and I work on his 06 2500 48re time to time. Long story short, he blew his heat exchanger on the side of the block. I don't have the pump the flush it so he took it to another 'custom' shop. And they are bypassing the heat exchanger and only going to use the cooler up front by the radiator. I don't think this is a good idea but I'm not an automatic Trans specialist... Lets hear it.

Kid doesn't tow much, pretty stock minus the smarty, exhaust and intake and constant floor boarding ofcourse.
 
I am under the impression the heat exchanger is to build heat in the tranny fluid for cold weather conditions.Not sure how cold it gets down your way.I have thought about deleting it on my 05 so there is no chance for cross contamination if it were to blow. This thread is about aftermarket coolers but has a few opinions on the heat exchanger.
Transmission cooler - Page 2 - Competition Diesel.Com - Bringing The BEST Together
 
Bypass it and live happy.
Seriously it adds heat to the trans oil. If bypassed just dont rail on it till the trans gets warmed up, aside from that its extra weight and restriction in the OE system.
 
homewrecker said:
I am under the impression the heat exchanger is to build heat in the tranny fluid for cold weather conditions.Not sure how cold it gets down your way.I have thought about deleting it on my 05 so there is no chance for cross contamination if it were to blow. This thread is about aftermarket coolers but has a few opinions on the heat exchanger.
Transmission cooler - Page 2 - Competition Diesel.Com - Bringing The BEST Together
Click to expand...


Yes that is the case, however I could see it performing some function of cooling if your pushing 250 degrees out of the convertor.
 
yes, it does heat the tranny fluid with coolant, to a point. but when the thermostat opens and cycles coolant, it does cool the tranny fluid. mine is staying on.
 
When towing heavy and in stop-go traffic the block mounted cooler is needed most. The block mounted cooler stabilizes temp spikes cause by converter slip, without it the trans can literally roast and you may never know it til it's too late.
 
LReiff said:
When towing heavy and in stop-go traffic the block mounted cooler is needed most. The block mounted cooler stabilizes temp spikes cause by converter slip, without it the trans can literally roast and you may never know it til it's too late.
Click to expand...

This is why I monitor the line out temp from the converter and pan temps.

I have the OE cooler in full flow mode (t-state eliminated), exchanger bypassed and a aux cooler under the bed with its own fan.
 
we have deleted them using 1/2'' inside diameter high pressure lines and installing a derale cooler up front. Done this to a customers trucks that use for farm and tow hadnt had a problem.
I have same set up on my pull truck wite derale cooler in fan mounted under the bed.
 
Mine is unhooked and haven't had any problems yet. I am careful with it when it is cold out for the first several miles. I think it runs cooler overall. I would like to make some custom trans cooler lines for it now though. Does anyone know where to get an adapter to hook up to the lines coming of of the front cooler. Btw, not trying to hyjack the thread.
 
got rid of mine early on. I never had a problem with trans temps. It must be replaced with a remote cooler though. Mine is mounted under the truck with a built on fan.

It's almost good insurance to not have it there with what many of us do with our trucks here.. If it goes out internally, you never know it until your trans is full of coolant or vise versa
 
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