48RE cooling problems

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Nov 26, 2013 | 05:14 PM

#16

Sam9290

Registered User

Joined: Oct 2013

Posts: 34

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From: Virginia

Heat Exchanger Bypass

Hello commtrd,

I interested in doing the bypass too, could you please post a photo or a sketch of how you did your bypass. The thought of getting anti-freeze coolant in my transmission, is not something that I want either. Just don't want to even take a chance on this happening.

Thanks,

Nov 26, 2013 | 08:46 PM

#17

michael/edge

Registered User

Joined: Feb 2010

Posts: 312

Likes: 0

From: wyoming

Is your torque converter starting to slip?

Few months ago I had the same problem. I could reach 240 with no problems. Towing was killing me. Had to pull over a lot.

Had my tranny looked at. Everything checked out great. Check ball valve was operating better than normal and on and on. In the end the TC was showing slippage . I said to heck with went with Triple disc TC and a custom 48re that can handle more power than I will ever see

Nov 30, 2013 | 12:36 AM

#18

dejaybailey

Registered User

Joined: Oct 2013

Posts: 29

Likes: 0

Quote:

Originally Posted by Sam9290

My transmission temperature on running as high as 190 degrees during the hottest days during summer. This concerned me greatly so installed a auxillary transmission cooler on my truck rated at for a 12,000 lb truck. After installed I noticed that my trans temperature runs between 140-155 consistanly. Also when temperature does rise above 160 degrees it drops quickl back down between 140 and 155 degrees. 2004.5 Dodge Ram 2500 4x4 48RE Trans Smarty Jr. Programmer AFE 4.5" Air Intake 4"Lift Kit

Same cooler, same experience ...

Nov 30, 2013 | 01:59 AM

#19

dejaybailey

Registered User

Joined: Oct 2013

Posts: 29

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Test

Quote:

Originally Posted by commtrd

i have the rtd mounted in the pan and it used to read from 130* to under 150* in the summer in south texas. I have a deep tranny pan (mag-hytek) and also an auxiliary atf filter on a housing i mounted on the port frame rail with stainless-clad hoses so there is quite a bit of extra capacity there. I have a triple-lock tc that is made [proprietary] by jeff garmon. Transmission is a stage 2 with billet input shaft and beefed up valve body etc. I also di a heat exchanger bypass around the exchanger mounted on the back of the engine due to several stories of guys who had that exchanger rupture, filling the transmission with coolant and subsequently putting the kibosh on any further use out of that tranny. Needless to say i did not want to pony up another $6500 for a transmission so decided to bypass the exchanger. I cut into the stainless line and ran a new piece of ss tubing up to the atf radiator in the front and left the return line intact. Changed the aux filter and re-filled with amsoil synthetic atf 4 so now the gauge never really gets over 130*. Granted the probe is in the pan but it still lets me keep an eye on how the fluid is doing and the transmission seems to be really happy like this. No problems running down the road at all. Plus i know there will never be coolant getting into the transmission.

Just thought i would throw that out there because i don't think a lot of guys realize the deal with that heat exchanger mounted on the engine. Not sure why it would rupture, maybe if fittings are over-tightened or something but at any rate it is good to be aware of. And i lost another 20* just from bypassing the exchanger.

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