| Trans Temp [message #155320] |
Tue, 03 January 2012 23:03  |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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Learning a little more about transmissions lately. I was wondering what is the normal operating temps of our stock trans, checking the temp from the pan. Example I'm not super good with wording often when typing but what would be the normal temp the trans should be at. I understand if the trans is to cool it will the radiator will keep it at a certain temp. I was wondering the upper range. I was seeing about 190 degrees this week on a long trip back from the lake. If I turned on my trans fan the temp stayed at 190. That made me think the trans didn't want to run less the 190.
Btw, I have the trans running thru the radiator into two coolers, one having a fan that I can turn on that pushes air. I use currently the stock pan.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
[Updated on: Tue, 03 January 2012 23:04] Report message to a moderator |
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| Re: [GMCnet] Trans Temp [message #155325 is a reply to message #155320] |
Wed, 04 January 2012 00:06  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
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My transmission temp rarely goes to 150 but on long hard pulls I've seen 190. Who knows how accurate my gauge is, but my beloved PO did install the aluminum Ragusa pan and an auxiliary cooler along with the gauge. He used to tow a Jeep.
Larry Davick
The Mystery Machine
On Jan 3, 2012, at 9:03 PM, Michael <@msn.com> wrote:
>
>
> Learning a little more about transmissions lately. I was wondering what is the normal operating temps of our stock trans, checking the temp from the pan. Example I'm not super good with wording often when typing but what would be the normal temp the trans should be at. I understand if the trans is to cool it will the radiator will keep it at a certain temp. I was wondering the upper range. I was seeing about 190 degrees this week on a long trip back from the lake. If I turned on my trans fan the temp stayed at 190. That made me think the trans didn't want to run less the 190.
> --
> ***"Gettin There"-1973 23' Sequoia-
> Michael, Casa Grande, AZ
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Trans Temp [message #155327 is a reply to message #155325] |
Wed, 04 January 2012 00:43 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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| ljdavick wrote on Wed, 04 January 2012 00:06 |
My transmission temp rarely goes to 150 but on long hard pulls I've seen 190. Who knows how accurate my gauge is, but my beloved PO did install the aluminum Ragusa pan and an auxiliary cooler along with the gauge. He used to tow a Jeep.
Larry Davick
The Mystery Machine
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I have exactly the same temps with the same setup. - Ragusa pan and an external trans cooler.
I went through two replacement trans temperature gauges that started at 150 and would not register. Then I realized the normal trans temp running down the road was below 150. I have seen 180 or a trace higher at the pan when climbing in the mountains of Colorado.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Trans Temp [message #155341 is a reply to message #155320] |
Wed, 04 January 2012 09:10 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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Hum I would of thought the trans temps would of been a little higher normally for normal operating range. But maybe I'm wrong. If my research was even remotely right, its usually closer to 200 since the radiator usually runs about 200 to burn off any moisture in the engine oil.
Now I'm more confused then ever. The PO but in a volt/trans temp/psi gauge in the cockpit. I'm pretty darn sure I saw the sensor in the left side of the trans pan where it should be. Maybe my temp gauge isn't accurate, but I really thought 150 would be low. But appreciate the responses. Any trans experts know the rated temp operating range?
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: Trans Temp [message #155344 is a reply to message #155341] |
Wed, 04 January 2012 09:28 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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| Mr.RadioActive wrote on Wed, 04 January 2012 08:10 |
Hum I would of thought the trans temps would of been a little higher normally for normal operating range. But maybe I'm wrong. If my research was even remotely right, its usually closer to 200 since the radiator usually runs about 200 to burn off any moisture in the engine oil.
Now I'm more confused then ever. The PO but in a volt/trans temp/psi gauge in the cockpit. I'm pretty darn sure I saw the sensor in the left side of the trans pan where it should be. Maybe my temp gauge isn't accurate, but I really thought 150 would be low. But appreciate the responses. Any trans experts know the rated temp operating range?
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If you are climbing to Roosevelt through Superior and Globe, what you are seeing is typical. A heat exchanger will work both ways as I'm sure you know. You never want the transmission oil temperature to go above 270 for any length of time because it will seriously start to break down.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Trans Temp [message #155346 is a reply to message #155320] |
Wed, 04 January 2012 09:31 |
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My coach has a Ragussa pan and no external transmission cooler except what's in the3 radiator. I measure the temperature of the oil on the pan. I normally run 190* and up to 200* pulling a long hill. I asked Manny at one of the rallys if this was OK and he commented "perfect"
Bill Brown - '77 Buckeye Cruiser
Coshocton OH
carguybill@sbcglobal.net
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| Re: Trans Temp [message #155354 is a reply to message #155320] |
Wed, 04 January 2012 09:40 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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Thank you for the answers. I didn't know anything about heat exchanging till recently when trying to learn about this subject. Now that i understand how that works thats why I thought 150 was low. I'd think 190-210 or so would be normal since the trans goes thru the radiator and if it was to cold the radiator would warm it. I have two coolers, one with a fan even and I can't seem to get it less then 190 when on the hwy even with the trans fan on.
Roosevelt Lake I normally go to (love it there) but this weekend I went to Lake Pleasant. Its a lot more hwy driving at 70 mph but not a lot of climbs. Roosevelt is a lot less hwy for me, but a ton more climbs. I'm making a shroud for one of the coolers to tunnel air better into it. But I'm starting to think that 190 maybe my trans correct range since any more cooling won't cool it lower. If its not its time for a Rockwell Pan.
Maybe if I go to CG rally someone can help me to see if the trans sensor is where I think it is in the pan.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: Trans Temp [message #155356 is a reply to message #155354] |
Wed, 04 January 2012 09:47 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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My first coach had the Ragusa pan installed in it by the P.O. I installed the VDO transmission temperature gauge in it. I finally did not like the visual display on the gauge, because it did not read low enough. Needle never moved, except when go to the top of Flagpole Knob, VA and driving up 3.5 miles of unimproved forest road. Mt top is 4400 feet and very nice for Amateur Radio use. VHF/UHF goes a long way when the antenna is high.
Tom Phipps, KA4CSG
MS II, with VHF capabilities (monitoring 146.52, while in motion)
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Trans Temp [message #155357 is a reply to message #155354] |
Wed, 04 January 2012 09:48 |
James Hupy
Messages: 6806
Registered: May 2010
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Michael, if you are reasonably certian of the accuracy of your gages, 190
degrees is right in the ballpark for hard pull properly cooled transmission
temp. In desert areas, when air temps are over 120 degrees at the radiator
level, it is not uncommon to see 250 - 270 degrees. Like Bob says, when it
gets over 270, you need to reduce the load, or stop and cool it off.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Wed, Jan 4, 2012 at 7:40 AM, Michael <radioactive626@msn.com> wrote:
>
>
> Thank you for the answers. I didn't know anything about heat exchanging
> till recently when trying to learn about this subject. Now that i
> understand how that works thats why I thought 150 was low. I'd think
> 190-210 or so would be normal since the trans goes thru the radiator and if
> it was to cold the radiator would warm it. I have two coolers, one with a
> fan even and I can't seem to get it less then 190 when on the hwy even with
> the trans fan on.
> Roosevelt Lake I normally go to (love it there) but this weekend I went to
> Lake Pleasant. Its a lot more hwy driving at 70 mph but not a lot of
> climbs. Roosevelt is a lot less hwy for me, but a ton more climbs. I'm
> making a shroud for one of the coolers to tunnel air better into it. But
> I'm starting to think that 190 maybe my trans correct range since any more
> cooling won't cool it lower. If its not its time for a Rockwell Pan.
> Maybe if I go to CG rally someone can help me to see if the trans sensor
> is where I think it is in the pan.
> --
> ***"Gettin There"-1973 23' Sequoia-
> Michael, Casa Grande, AZ
> _______________________________________________
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> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Trans Temp [message #155360 is a reply to message #155341] |
Wed, 04 January 2012 09:55 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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This Chevy P-30 chassis manual contains the best information I know of
about ATF & temperatures. It wasn't written specifically for the TH-425,
but should be equally applicable:
http://bdub.net/manuals/P30/P30.pdf
Since the ATF is normally heated/cooled by the same radiator as the engine,
you'd expect them to both run at the same steady-state temperature. And
that's been my experience: The ATF runs below the engine temperature for
up to several hours before finally stabilizing at the engine temperature.
With an auxiliary cooler, or a more efficiently cooling transmission pan,
that delay will be longer, and the transmission will take longer to reach
the engine temperature. Under transient conditions, such as idling in
traffic or climbing a grade, the transmission temperature will increase
more rapidly than the engine temperature.
'Least that's what all those gauges keep telling me. :-)
Ken H.
On Wed, Jan 4, 2012 at 10:10 AM, Michael wrote:
>
>
> Hum I would of thought the trans temps would of been a little higher
> normally for normal operating range. But maybe I'm wrong. If my research
> was even remotely right, its usually closer to 200 since the radiator
> usually runs about 200 to burn off any moisture in the engine oil.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Trans Temp [message #155387 is a reply to message #155320] |
Wed, 04 January 2012 14:24 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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Ken what you are saying is almost exactly what I'm seeing.
The trans when "warm" is about 160. Then after continuing at high speed driving after awhile it settles about 190 and says pretty steady there. Maybe goes up a hair from time to time depending on the grade. This trip I monitored it more then other trips. I noticed 190 was where it settled at driving full loaded at about 65-75MPH and the air temp outside was about 75 degrees.
If I turned on my trans cooler fan I noticed it didn't drip one bit, it seemed like the normal operating temp the radiator wanted to keep it at was 190.
If the radiator is what regulated it when its cold and then cools it off I'd imagine if the engine is up to full temp, then 190 or so would be correct since the motor likes to be near the boiling point to burn off condensation in the oil.
I'm far from a expert and this line of thinking for me is totally new. But researching it, made me think adding a rockwell or ragusa pan in addition to the (2) coolers and (1) cooler fan would be overkill since the coolers only cool it when it exceeds normal temps. If I added a new pan and the radiator regulates the temp then 190 would be normal. As long as my coolers can keep my trans cool during hard climbs and big loads then I may have the trans cool enough.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: [GMCnet] Trans Temp [message #155439 is a reply to message #155360] |
Wed, 04 January 2012 19:47 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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"" Under transient conditions, such as idling in
traffic or climbing a grade, the transmission temperature will increase
more rapidly than the engine temperature.
""
That's my experience--in fact I have never seen quite as high temperatures climbing as I have idling. The converter can generate a lot of heat in stop and go traffic.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Trans Temp [message #155451 is a reply to message #155387] |
Wed, 04 January 2012 21:09 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
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The trans cooler is in the lower section of the radiator. that is the coldest coolent in the radiator, this time of the year it is likely around 150 degrees or less at crusing speed in Arizona. Are you pumping the trans oil into air cooled coolers first then into the radiator cooler? If so you could be warming the oil up some. If you pump the oil into the radiator 1st then run it into your 2 air cooled coolers as the oil returns to the trans it will likely be cooler.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Trans Temp [message #155485 is a reply to message #155337] |
Thu, 05 January 2012 02:51 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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| Dolph Santorine wrote on Wed, 04 January 2012 07:45 |
Since at least two people on this thread have the pans, Rockwell or Ragusa?
Thanks.
Dolph
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I have had the Ragusa for years and I'm happy with it but...
I have seen the Rockwell one from Jim K. and it definitely has more capacity and looks like a good piece of work. Call Jim K. and talk to him. He sells both of them. If I were buying one now I would have a hard time making up my mind on which one to get.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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