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Old August 20th, 2012, 01:42 PM   #1
Bo's Cj 7
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Default Motorhome C6 Transmission Oil Temp Question

I have a 1988 30 Ft Class A Motor, Ford 460, C6 Auto Transmission, not sure of the weight. It has about 45000 miles I bought it early summer I changed trans fluid and filter after purchase but it look good when changed. I went to silver lake tow my Glass Cj 7 on tandem axle flat bed trailer. When heading up any hills trans oil temp would sky rocket. Normal flat cruising 55-60 mph temp would be 180-200, but get to a hill and it would shoot up, a few times to almost 280. When I got home I checked fluid it was very dark but didn't smell burnt. I changed fluid and flush out transmission with fresh fluid added a 16"X11" cooler put it in line with factory cooler that is approx 24"X10", I also check fluid flow through both cooler and it seemed fine. I drive the motor over the weekend no trailer and temp went up to 260 at one point. It goes up very quickly, this is on the output fluid line and I have tried two different gages. The fluid does not go through the radiator. I have heard people put gages on outlet of cooler but that only tells you if cooler is working not if trans is burning up. give me some advice or things to try to keep it cool.

Last edited by Bo's Cj 7; August 20th, 2012 at 05:30 PM. Reason: add more info
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Old August 20th, 2012, 05:30 PM   #2
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Old August 20th, 2012, 07:08 PM   #3
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If you have the gauge in the output line you are seeing the temp coming out of the converter, it is going be hotter there then anywhere in the trans. esp when under load.

I like the sensor in the pan as you get a better idea on how hot the trans really is.

Your converter could be showing its age and be less efficient causing higher temps but I bet any non-lockup converter in a motorhome has fairly high fluid temps coming out.

You could try a deep(er) pan but I don't think it will make a huge difference.
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Old August 20th, 2012, 07:45 PM   #4
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The fluid got dark after about 500 miles so I am sure the oil temp is too high and will evenually burn the trans up. I have read 280 and above will start to cook the Orings and you will loose pressure and everything else. I didn't know a converter could wearout but if its slipping to much that would make heat and keep RPMs higher it only got 5.5 MPG towing could be slipping I guess. I would much rather change the converter than rebuild the whole thing. Anybody body else have any ideas.
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Old August 24th, 2012, 07:12 AM   #5
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