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Old 11-26-2013, 06:03 PM
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Cooling Question for Auto Tranny

My son and I just bought a 48 Chevy Coupe... drive train (350/350) is roughed in, but the whole thing needs a lot of love. We'll need to address the radiator for sure. Here is my question: Would running the trans. lines thru a radiator be enough? Or should I skip the radiator and just go w/an auxil. cooler for the tranny? OR do I need both the radiator to do it's thing, then run tranny fluid thru an auxil.? The lines already are crimped so I'll have to deal with them anyway. Any thoughts?? Any help is appreciated.

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Old 11-26-2013, 07:28 PM
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If the radiator has the capability for trans lines I would use them, if not use an external cooler. The thought is radiator trans line are more for heat than cooling.

Vince
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Old 11-26-2013, 08:18 PM
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If you use an auxillary cooler,route your lines to it 1st,then back thru the radiator to maintain proper temp for the fluid.The aux will remove any excessive heat 1st while your radiator will keep it @ the proper temp.Too cold fluid is bad for the tranny as well.They say 170* to 180* is the ideal temp.
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Old 11-27-2013, 05:49 AM
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If you live in colder climate I'd do it like joker said. If you live in blazing heat like me ( central Texas) then bypass the radiator an just use the external cooler. Their are external coolers that have a built in thermostat also.
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Old 12-03-2013, 01:27 PM
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Quote:
Originally Posted by RAMBEAU View Post
My son and I just bought a 48 Chevy Coupe... drive train (350/350) is roughed in, but the whole thing needs a lot of love. We'll need to address the radiator for sure. Here is my question: Would running the trans. lines thru a radiator be enough? Or should I skip the radiator and just go w/an auxil. cooler for the tranny? OR do I need both the radiator to do it's thing, then run tranny fluid thru an auxil.? The lines already are crimped so I'll have to deal with them anyway. Any thoughts?? Any help is appreciated.
I think the standard cooler in the radiator is enough, this sufficies for Chevs from passenger cars through pickup trucks which pertty much has the 48 bracketed weight wise. Towing in high gear is probably the hardest on the transmission and the largest maker of overheated oil, you'll note because of this the 700R4/4L60/4l60E does not operate in 4th overdrive nor with converter lock up in that situation.

However, if you want to add an external cooler I would plumb it to the external cooler first then to the radiator cooler so as to provide a warmed oil at constant temp to the trans which happens to like the oil temp pretty much right in the range the engine likes it's coolant temp.

Bogie
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