| [GMCnet] Keeping your transmission as cool as possible [message #356715] |
Mon, 13 July 2020 10:06  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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An auxiliary trans cooler must be installed in the steel line. That the ATF is coming OUT of the radiator. Then heading back to the trans. As the radiator is a liquid to liquid type cooler. These types of coolers are very good at transferring BTU's. The trans cooler Is mounted inside the cold tank of the factory radiator. Then the ATF goes to the auxiliary cooler for further cooling. Auxiliary coolers are liquid to air type of cooler. This type of cooler is MUCH less efficient then a liquid to liquid type. If you put the aux cooler in the input line to the rad. You will negate what cooling you got done with the aux cooler that you just put in.
If you by pass the factory rad cooler for some reason. The new liquid to air cooler should be almost as big as the radiator itself. The 1 ft sq. cooler will NOT displace enough BTUs. To adequately cool the trans. Check the BTU ratings of any cooler you buy. First.
Bob Dunahugh
________________________________
From: Keith V
Sent: Monday, July 13, 2020 9:03 AM
To: gmclist@list.gmcnet.org
Cc: Bob Dunahugh
Subject: Re: How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule.
sounds like good advice Bob,
So what makes a CORRECT trans cooler install?
________________________________
From: Gmclist on behalf of Bob Dunahugh via Gmclist
Sent: Monday, July 13, 2020 12:35 AM
To: gmclist@list.gmcnet.org
Cc: Bob Dunahugh
Subject: [GMCnet] Fw: How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule.
John Phillips. I have a Digi Panel. My trans temp stays about the same. Mtn's, or the flats of the Midwest. If you want to get more life from your trans. Be nice to it as to driving habits. Put a large aux trans cooler in CORRECTLY. Most that I've seen are installed incorrectly. Get a 3:70, or 4:10 FD. To reduce a lot of load on that 425 trans. And improve your MPGs. I'd never install a 3:21 FD. As it's such a tiny improvement. Towing or not. My Trans has put up with all this loading for over 100,000 miles. With standard ATF. Has stood up by what I do to it. Or I'm just dam lucky. ( GRIN )
Bob Dunahugh
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From: Bob Dunahugh
Sent: Sunday, July 12, 2020 1:13 AM
To: gmclist@list.gmcnet.org
Subject: How my trans survives with a 17 to 24,000 lbs GVW all the time. A simple rule.
I rebuilt my trans myself. 17 years ago. I have a very simple rule. That I fallow religiously. Never use more than half throttle on any climb. PIRIOD. EVER. It comes down to BTU input by way of the throttle position. I'm an active down shifter. Have a 3:70. Sometimes I'll have the engine over well over 4,000 RPM's. I up shift, or down shift manually on climbs. And always let off the throttle during shifts. I change my trans fluid every year.
Sometimes I have a contest with myself. As to how many cars can I get to pass me each mile. ( I'm so easy to keep entertained on the road.) GRIN.
Bob Dunahugh
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| Re: [GMCnet] Keeping your transmission as cool as possible [message #356725 is a reply to message #356715] |
Mon, 13 July 2020 13:33  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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That is an interesting point.
I am running a "superior aluminum radiator". the tranny lines leave the tranny, go to the tranny cooler mounted in the radiator. then out to the aux tranny cooler. and back to the tranny.
but... no fan on my tranny cooler. no guages.
what I now ponder with your post, is how effective is the tranny cooler that is in that radiator? it is not a stacked plate, I think it is just a snake tube that runs in the tank.
the radiator has impressed me.... solid temps, engine always been running 198-203 degrees. no matter how hot or cold it is outside and what I have been hauling or doing. but maybe the tranny cooler is not as good as it could be in that radiator....
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Keeping your transmission as cool as possible [message #356728 is a reply to message #356725] |
Mon, 13 July 2020 14:00 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I would defer to the radiator mfg. about the internal cooler.
Jim Hupy
Salem,Oregon
On Mon, Jul 13, 2020, 11:34 AM Jon Roche via Gmclist <
gmclist@list.gmcnet.org> wrote:
> That is an interesting point.
>
> I am running a "superior aluminum radiator". the tranny lines leave the
> tranny, go to the tranny cooler mounted in the radiator. then out to the
> aux tranny cooler. and back to the tranny.
>
> but... no fan on my tranny cooler. no guages.
>
> what I now ponder with your post, is how effective is the tranny cooler
> that is in that radiator? it is not a stacked plate, I think it is just a
> snake tube that runs in the tank.
>
> the radiator has impressed me.... solid temps, engine always been running
> 198-203 degrees. no matter how hot or cold it is outside and what I have
> been hauling or doing. but maybe the tranny cooler is not as good as it
> could be in that radiator....
>
>
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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