Home » Public Forums » GMCnet » [GMCnet] How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule.
| [GMCnet] How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356689] |
Sun, 12 July 2020 01:13  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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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] How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356691 is a reply to message #356689] |
Sun, 12 July 2020 05:16  |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Hi Bob,
If you monitored all the temps would you use more throttle while they were
low? We have a relatively large engine that can produce a lot of power but
if the cooling systems seem to be under configured. Pound for pound we have
as much power as a big 400 HP diesel pusher. Is all your concern thermal
limited or are you also concerned about mechanically overloading the
transmission and final drive?
John Phillips
1975 Avion VIN A26000
Citrus Heights CA. 95610
On Sat, Jul 11, 2020 at 11:13 PM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| [GMCnet] Fw: How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356706 is a reply to message #356689] |
Mon, 13 July 2020 00:35 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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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
________________________________
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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Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356712 is a reply to message #356706] |
Mon, 13 July 2020 09:03 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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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
________________________________
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
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Fw: How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356736 is a reply to message #356706] |
Mon, 13 July 2020 16:28 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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Bob, as I read that you are more concerned about overloading the 425 trans
and the lower FD gives reduces the torque on the transmission. You do
not use the power the 455 has available. What is the stock FD? How do
people connect a cooler incorrectly? I have not checked but I think my
coach has a stock FD and cooler. I do have an aluminium radiator.
*J**ohn Phillips*
*1975 Avion VIN A26000 *
*Citrus Heights (Sacramento) CA 95610*
On Sun, Jul 12, 2020 at 10:36 PM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> 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
>
> ________________________________
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
_______________________________________________
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] How my trans survives with a 17 to 24, 000 lbs GVW all the time. A simple rule. [message #356737 is a reply to message #356712] |
Mon, 13 July 2020 16:38 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Trans fluid has an additive package that is exhausted by heat.
I try to change it every 10,000 miles as I tend to drive hard and tackle
mountains.
Since we travel accross the country , I drop the pan and visually check for
metel paticals.
If it looks good, we install the pan W/O new filter.
Synthetic fluid has lot of great advantages.
On Mon, Jul 13, 2020 at 7:04 AM Keith V via Gmclist
wrote:
> 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
>
> ________________________________
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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