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400 mile tow • trans temp gauge • etc


Cobra
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Re: 400 mile tow • trans temp gauge • etc

Post by Cobra »

Has anyone in the colder climate thought of putting a switch in to switch the fluid flow so we can have it stand alone in the summer and in line in the winter (wonder if it's even worth the effort for our 1 month summer lol)
Edit:oh... those solenoid operated hydraulic valves aren't cheap... anyone know how many GPM pass through our tranny coolers?
1998 GMC Safari AWD, BFGoodrich AllTerrain T/A
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler

1997 in storage (project coming soon)
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LaGrasta
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Joined: Fri Jan 19, 2007 2:07 pm
Location: Mission Viejo, CA

Re: 400 mile tow • trans temp gauge • etc

Post by LaGrasta »

I leave for a week's camping vacation (Yosemite National Park) tomorrow morning at 5am. Hmmm, dare I go and reconfigure it today, just prior to leaving?
1998 Astro, 224,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box

astrozam
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Re: 400 mile tow • trans temp gauge • etc

Post by astrozam »

Take lots of pics for us. Are you going to check out half-dome?
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LaGrasta
I sleep in my van
Posts: 705
Joined: Fri Jan 19, 2007 2:07 pm
Location: Mission Viejo, CA

Re: 400 mile tow • trans temp gauge • etc

Post by LaGrasta »

yeah, we'll check it out, but from the base. :yawinkle:
1998 Astro, 224,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box

Meterpig
I finally get the smurf thing
Posts: 191
Joined: Tue Dec 28, 2010 4:06 pm

Re: 400 mile tow • trans temp gauge • etc

Post by Meterpig »

This topic has come up a lot on Yotatech in regards to cutting off the radiator completely. Nobody, and I mean nobody has reported any problems with cutting out the radiator. I imagine that if you lived in a climate that routinely saw sustained temps of freezing or below, this might be an issue-and I say might. ATF is a super thin oil living inside of a machine that generates a lot of heat.

Just do it and if you don't like the results-hook it all back up.
What do you think of my quest to swap transfer cases to the venerable BW4472?
viewtopic.php?f=58&t=9962

Photos including tear down for intake gaskets (PITA)
http://www.smugmug.com/gallery/n-xSjRG/i-bHzD6cz

brokenwrench
I finally get the smurf thing
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Re: 400 mile tow • trans temp gauge • etc

Post by brokenwrench »

LaGrasta wrote:So you advise bypassing the rad cooler to lower the trans temps? I do understand being in SoCal, we really don't need to heat the trans fluid like other climates.

Anyone else have any advise on this?
Several problems with this flow of logic. The engine thermostat prevents the radiator from warming up the transmission fluid until it opens. If you are driving, the transmission has warmed itself up and "gone through the gears" so to say long before the engine is up to operating temperature. The optimal operating temperature for an automatic transmission is 165 to 175 degrees farenheit. This is theoretical as the temperature varies all through the transmission depending on what it is doing. The ideal temperature has to do with seal performance, nothing else. The mechanicals of the transmission are lubricated at any operating temperature. An automatic transmission operating below the idea temperature range may shift awkward but that is all. Some modern engines have a temperature sensor to prevent shifting into overdrive until engine operating temperature is reached.

The optimal arrangement is a isolated cooler (not inline with engine) with a fan and thermostatic switch. I have never seen an automatic overheat with any remote cooler stuck in front of the radiator, fan, thermostat or not. Nor have I ever seen an automatic operate at too low a temperature. If you want to get creative, take the thermostatic valve from a sandwich oil adapter and put it inline with you cooler. They start to open at 165 degrees.

Where I live in Canada it is routinely minus 20 degrees and certainly there are minus 30 days and the occassional minus 40 days. We bypass all in-radiator transmission coolers and I have heard of no mishaps.

If you want both your engine and transmission to live longer, take out the 195 degree engine coolant thermostat and put in a 165 degree one. You will also get about 3 or 4 miles to the gallon better mileage. Put on the biggest steel pan on your transmission that you can (Derail), put an inline filter on the out line on your transmission, you can use remote oil filters or transmission specific ones. Don't waste money on an aluminum pan. Upgrade the accumulator servo piston (outside the case), many use Corvette pistons but better after market ones are available and are cheaper. Install a "tow and go" shift kit. When you put on your deeper transmission pan, if you buy the filter extension it puts your filter intake back on the bottom of the pan where are the fallout accumulates. It is better to make a little suspension cage from gas welding rod and keep the pickup off the bottom of the pan.

I rebuild transmissions and engine for a living, about 50 each per year, no imports,
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LaGrasta
I sleep in my van
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Joined: Fri Jan 19, 2007 2:07 pm
Location: Mission Viejo, CA

Re: 400 mile tow • trans temp gauge • etc

Post by LaGrasta »

An update: Still running through both the radiator and extra tranny cooler. Temps still rise uncomfortably when towing, climbing hills, severe stop and go, etc. But with all said, still original tranny and not showing any real signs of damage, 174k…
1998 Astro, 224,000 miles

K&N air filter
TruCool trans cooler
2" Overland lift & 15" BFG Terrain, 3.73 gears
JET Performance SCU-2000 (Speed Control Unit)
Gabriel Ultra shocks, rear AirLift bags & sway bar
iPOD, CD, DVD, Dutch door mounted 12s, 400w
Draw-Tite Dual Port Hitch System, hitch-mounted bike rack (4), hitch-mounted cargo tray, Thule roof-mounted cargo box
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