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I have to agree with 78-fordman,but if you want to hear a good one my brother-in-law lives in rhode I. and i live in upper NH and when he goes skiing as soon as he hits the mass/NH border he drops the overdrive ! why? you ask ! well because he drives a dodge and his owners manual says to when driving in the mountains, i could just see him out west ,he would probably be in low-1 ,if you are wondering what he hauls ,well its a cargo of his wife and two pairs of skiis ,but remember it is a dodge
Correct, shifting does create heat, and can be annoying, if its shifting alot in and out of overdrive then take it out of overdrive. But dont forget your tranny shifts constantly during around town and stop and go driving, with little or no air flow through the stock tranny cooler setup and the torgue convertor is working much harder. Each to thier on here. Just my .02, Happy towing guys.
rvfiver,
noticed from your signature that you have a 12V Fan cooling your auto transmission cooler. I tow a 10,000lb fiver myself and so far the tranny temp gauge has never wavered, it stays rock solid even on long uphill stretches (stock gauge).
Still, I would be interested in hearing more about your setup with the tranny cooler. If you have time, an explanation would be much appreciated. Thanks.
canuck999, I too tow a heavy 5er, about 13,000+. After seeing that my tranny temps when towing were running 210-235 degrees on my issapro gauge I decided to put on an extra heavy duty cooler. This is in addition to the stock cooler. Anotherwords I did not bypass or take off the stock cooler. It is made by BD and is a double stacked about 10X12 tube and fin cooler with a 10in 12v fan attached to it that can either be controled by a switch in the cab or can be purchased with an automatic turn on according to temp. I use the switch. The beauty of this unit is, because it is fan cooled you can mount it where ever you have space. You don't have to mount it up front in tight spaces to get air flow. I mounted mine under the passenger seat area. (outside of coarse, not in the cab).
Back to the original subject, the reason that the don't tow in overdrive recommendation exists is that the older transmissions (AOD for example) had less strength in the overdrive gearing than the rest of the transmission's gears. Heavy loads in OD could damage hard parts even if the transmission was not hunting gears. The E4OD has many weaknesses but strength of its gear train is not one of them. OD is as fine as any other gear.
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