Towing in Overdrive with E40D ???? - Diesel Forum - TheDieselStop.com
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Old 03-21-2005, 07:25 PM   #1 (permalink)
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Towing in Overdrive with E40D ????

I have a 95'dully with a E40D transmission, 4.10 rearend. Is it ok to tow a heavy load in overdrive. I don't know if the truck has a towing package. I don't see any external transmission cooler. I bought it at 92k mi. The previous owner said he towed in overdrive. At about 115k mi I had to get the transmission rebuilt. I don't want to go through another transmission.
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Old 03-21-2005, 07:50 PM   #2 (permalink)
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Re: Towing in Overdrive with E40D ????

your not supposed to tow really heavy loads in od because if it downshifts from od to d it gets hard on the tranny and can cause it to over heat but ive always towed in od once im out on the flats or once i get goin a good clip down the road but if im comin up on a big hill ill drop it down to od to prevent it from shifting on me.
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Old 03-21-2005, 08:06 PM   #3 (permalink)
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Re: Towing in Overdrive with E40D ????

As you mentioned you will definetely want the stacked plate external cooler to keep the tranny temps in check. Also a tranny temp gauge is a must to keep an eye on the E4OD. I tow in overdrive all the time as mentioned before if it strarts hunting put it back into drive until terrain allows O.D. again. Hope this helps!
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Old 03-21-2005, 08:58 PM   #4 (permalink)
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Re: Towing in Overdrive with E40D ????

I agree with Bigred on this one! Get yourself a good sized tranny cooler (most come with a small one) to keep the fluid as cool as possible.
I've had a transmission temperature fluid gauge for some time now, and that way you always know just how hot it really is.
Towing my 26' travel trailer up some of the steepest hills around, I've never seen my gauge over 195 F, and you certainly don't want to "boil" your fluid!

I always tow in OD, but in saying that, I've gotten to know my truck real well, since I've owned it for nearly 10 years now, and I know when to take it out of OD, by the RPM the engine is at. With my larger injectors, I can tow up most hills, even at a 6% - 8% grade in OD, but I DO watch my Pyrometer along with my RPM's, and lock out OD if my speed starts to slow down.

So, with a set of gauges, it makes the job of locking out OD much easier, along with listening to the engine...as you'll hear when it starts to "labor" which is when its time to take it out of OD.

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Old 03-22-2005, 07:16 AM   #5 (permalink)
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Re: Towing in Overdrive with E40D ????

[ QUOTE ]
your not supposed to tow really heavy loads in od because if it downshifts from od to d it gets hard on the tranny

[/ QUOTE ]
It's not the downshift that's hard on it, it is frequent downshifts and upshifts.

Towing in OD is fine as long as you don't get excessive shifting.
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