will this work for transmission temp?

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letank
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Re: will this work for transmission temp?

Postby letank » Fri Feb 03, 2017 10:50 am

Grand_Wag_85 wrote::shock: Slight hijack...on the TF727 which of the cooler lines is the outbound line and which is the inbound?

Also, they say to put the probe in the hottest part of the trans. Would that be the pan or the outbound pressure line?


the return line from the cooler is the one in the back of the TF727, so the front line at the trany is the output to the cooler.

I did not want to deal with extra fittings on the cooler lines, So I used one of the service ports, as pictured earlier on page 1 post #2. Waiting for summer to see real temp readings.
Michel
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Grand_Wag_85
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Re: will this work for transmission temp?

Postby Grand_Wag_85 » Fri Feb 03, 2017 12:56 pm

I saw the post where you referenced the service port. I'm putting in a cooler and was feeling too lazy to start a new post :p
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will e
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Re: will this work for transmission temp?

Postby will e » Fri Feb 03, 2017 1:18 pm

I figured even if i didn't have 'the hotest' place in the transmission I would know what 'normal' is for the location. Good enough for me.

I do think i read somewhere that the service port was used on some cars and trucks that had factory transmission temp gauges.
81 Wagoneer - 'WILL E' Retired

82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau Moab Seats/RCI 6point Harness/Hella Aux lights/tuffy console/killer32 sliders/custom bumpers and roll bar/WARN 8000/steering brace/CB/dual batts/custom TC skid plate

letank
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Re: will this work for transmission temp?

Postby letank » Sun Feb 11, 2018 11:24 am

A little follow up. Took a long drive and we have this summer weather in the 70-74 last week.
Temp measured at the rear servo area, which is probably the coolest because it is the closest to the cooler return line:

at 65mph it stayed in the 160-165, in town with stop and go 170-173, back on secondary road at posted 55mph, it dropped to 155-158.

on the 2 to 3 mile hill climb, it went to 178-180, on the downhill, it took a while a good 2 miles to return to 170, in fact the trans fluid temp went down after the radiator temp went down -all on D mode-

the last stretch is a steep hill climb that is done in 2 gear , usually 25-30mph because of the sharp turns for 2 miles. There was a lot less increase in the temp of the transmission temp that I expected, it did not shoot over 170, the radiator temp did not go past middle, in fact it was getting colder because of the 2300' level, but it was still in the 60's. In the summer days 80's the radiator goes past the half mark for a long time as it is crawl mode for the next mile, but during this test the coolant temp did not go past the mid level, even as the gate was fubar and I had to let it idle in gear for 5 mins, back up turn around and use the other gate.

Edit: the half mark (or about) is now my normal operating coolant temp, after the CVR swap to the LM3506, the coolant temp jumped from the normal 1/3 to the half mark.

second edit: driving back at night it was 20 degrees cooler at 50ish and the trany fluid temp dropped by about 20 to 30 to 135-140F but speed of 55 or 65 did not increase trany fluid temp. The only increase to 160F was in stop and go traffic in the city from stop light to stop light
Last edited by letank on Wed Feb 14, 2018 10:55 pm, edited 2 times in total.
Michel
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tgreese
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Re: will this work for transmission temp?

Postby tgreese » Sun Feb 11, 2018 2:18 pm

:P Just reading this after it's all done ...

Seems to me this would be a perfect application for soldering. Get a brass bushing the right size for the sender, use a step drill to make a hole in the side of the pan, thread in the bushing and use your plumbing setup to solder it in. A propane torch would be enough; brush on some flux and use plumbing solder. Easy.

But it's already done - maybe this will help someone in the future.
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letank
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Re: will this work for transmission temp?

Postby letank » Tue May 15, 2018 5:54 pm

at over 2660 views, this is the place to post, fiddling with transmission cooling line on the other project and found this post about trans temp (still running in the 160 and 170ish when going on long up hill with outside temp in the high 70's)

http://www.ifsja.org/forums/vb/showthread.php?t=134261

or

Here is a quote from the Orange ($8.95) GM manual:
--------------------------------------------------------------------------------------

"OIL TEMPERATURE MEASURED AT CONVERTER OUTLET TO COOLER.

300F is the maximum temperature. (Workhorse says 350F). This is the normal place to install a temperature gauge or signal. The temperature in this location will vary significantly with each vehicle start-up or hill. If the temperature reaches 300F (350F), reduce throttle. To lower the transmission temperature with the transmission in NEUTRAL, run the engine at 1,200 RPM for 2-3 minutes to cool the oil. Do not allow the converter outlet temperature to exceed 300F (350F).
Keep a close check to prevent the engine cooling system from overheating.

300F would be typical of rocking the vehicle in mud, snow, or sand, or a transmission in stall (full throttle, no vehicle movement). When the transmission is in stall, the transmission will develop heat at a rate of one degree per second of stall.

OIL TEMPERATURES MEASURED IN THE SUMP

150F -- Minimum operating temperature for continuous operation. It is possible in low ambient temperature to overcool the transmission with oil to air-type coolers; it is hard to overcool if used in conjunction with oil to water coolers installed in most standard automotive

190F-200F -- Maximum oil level checking temperature. Beyond this, readings are not reliable because of expansion.

285F -- Maximum sump/oil pan temperatures for short duration such as a long hill climb.

300F -- Metal parts inside the transmission begin to warp and distort in varying degrees, seals melt rapidly, and transmission fluid life is extremely short due to oxidation and distress.

AUTOMATIC TRANSMISSION FLUID OXIDATION Automatic transmission fluid
can provide up to 100,000 miles of service before oxidation occurs under normal operating temperatures of about 170F. Above normal operating temperatures, the oxidation rate doubles (useful life of the fluid is cut in half) with each 20 degree increase in temperature. The approximate life expectancy at various temperatures is a follows:
Degrees F Miles
175 100,000
195 50,000
212 25,000
235 12,000
255 6,000
275 3,000
295 1,500
315 750
335 325
375 80
390 40
415 Less than 30 minutes

After-market temp gauge should be installed in the lower (hot) line entering the lower fitting of the radiator.

After-market external oil to air cooler should be installed in series. The hot oil line should go first through the aftermarket cooler then into the radiator to maintain proper minimum temp of the trans in low ambient temps.”

End of GM copy from orange manual.
Michel
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letank
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Re: will this work for transmission temp?

Postby letank » Mon Jul 09, 2018 11:59 am

Took a ride on a new GC trail hawk with all the bells and whistles. We did a serious hill climb on a sierras dirt trail, 4 low on a 2mile loose dirt, not exceeding 10mph. All the temp gauges you can imagine on the center dash display. Engine had been off for 45min before the trip back. The trans temp went up really fast after the first 1/4 mile we were at 194F, coolant at 195F, oil temp 213F, you have to love digital gauges. Trans temp climbed past 205F at the end of the up hill, and went back to 200F while on a level ground, outside temp was a low 80's
When I am back on both legs, time to take the waggy on the same road and see if I can make it up... for trans temp evaluation as well as coolant temp...
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Michel
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rocklaurence
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Re: will this work for transmission temp?

Postby rocklaurence » Mon Jul 09, 2018 12:56 pm

I've run several Trans gauges, bypassed the Radiator and used a Large Aux cooler. I've noticed on new and older transmissions that they run between 160-180 during normal street driving. Off Road they will creep up to +- 200. If the temp runs any higher under extreme driving, an additional fan is need or a larger cooler is needed. I live in Florida and dont have to worry about extreme cold and temp not getting warm enough during winter. I've never agreed with introducing engine heat into the transmission via the radiator.

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will e
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Re: will this work for transmission temp?

Postby will e » Mon Jul 09, 2018 2:31 pm

My transmission lines go through the radiator. I can pretty much use my trans temp as a engine temp gauge. The two move pretty close to each other. It will be interesting to see the difference when I bypass the transmission and use an aux cooler.
81 Wagoneer - 'WILL E' Retired

82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau Moab Seats/RCI 6point Harness/Hella Aux lights/tuffy console/killer32 sliders/custom bumpers and roll bar/WARN 8000/steering brace/CB/dual batts/custom TC skid plate


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