1997 E40D towing question - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 08-06-2015, 05:19 PM Thread Starter
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Red face 1997 E40D towing question

I am both new to Powerstrokes and Automatic transmissions as well..... My 1997 F350 Crew Cab with 7.3 Powerstroke has (I am told) the E40D transmission in it with 411 rear end gears.. I pull a 12,000 lb fifth wheel camper and a 2000 lb car behind that on a tow dolly... Can I tow in OD or not???????? Last truck was a 6.2 Chevrolet with no turbo and a later model 5 speed...... slow up a hill but 70 or 75 on flat or down hill..... without OD I am tached out at 65 mph.......but pulls great on a hill..... just hate to keep it on 3,000 rpm's .............
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post #2 of 7 (permalink) Old 08-06-2015, 07:30 PM
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Re: 1997 E40D towing question

If it doesn't keep shifting in and out of overdrive you can tow all day long in overdrive.

Mark
Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #3 of 7 (permalink) Old 08-06-2015, 10:28 PM Thread Starter
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Re: 1997 E40D towing question

Thanks Mark, I have just replaced the transmission and just wanted to make sure I did not mess the new one up..... Darn things are expensive!!!!!! I also added a heavy duty auxiliary trans cooler to the truck, and a Trans oil temp gauge.....What temp should it run? are there any additives that will help?

Thanks... Stan
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post #4 of 7 (permalink) Old 08-07-2015, 12:03 AM
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Re: 1997 E40D towing question

When you say you added a cooler, what coolers are on the truck? Please list all of the trans coolers you have.

Anything below 220F is fine. You can go up to 250F for no more than a half hour at a time.

I'm not aware of any additives that do anything good for the transmission.

Mark
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post #5 of 7 (permalink) Old 08-07-2015, 12:03 PM Thread Starter
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Re: 1997 E40D towing question

All I found factory was a Engine oil cooler in front of Radiator and the trans went to the cooler in radiator...... I added a Heavy Duty transmission cooler from Summit for diesel, 26000 GVW I think..........also the B&M trans temp gauge.
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post #6 of 7 (permalink) Old 08-07-2015, 12:11 PM
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Re: 1997 E40D towing question

FWIW, towing in OD is more than ok. John Wood built my trans and told me that the OD gear is actually getting the most oil so it's really safe to tow and drive around town in overdrive. I had come from the old school GM mentality that driving in OD was really bad for the trans, but that was the 700R4 and does not apply to all auto transmissions. The E4OD apparently bathes the OD gear in oil so there are no worries.

Byron
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post #7 of 7 (permalink) Old 08-07-2015, 12:14 PM
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Re: 1997 E40D towing question

i got pretty much the same setup as you. I pull a lot over the passes here in colorado with 8,000# plus loads. Never have had any trouble with trans temps.

I more have to watch EGT more than trans temp, and down shift out of overdrive to keep it down.

1997 f250 supercab 4x4, h2e turbo, rickson 19.5" tires, stage1 injectors, superduty HPOP, DP tuner chip, 99 SD intercooler, dana 60 front end, DIY intake, BTS trans, 6.0 plastic fan, torqlift superhitch.
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