E40D Compared to 4R70W and 4R100

nut man jack · #1 11-14-2005, 12:41 AM

I have an 2002 F250 SCrew 4x4 Off Road with an E40D transmission. My question is: Why so many different transmissions? I have 30,000 miles on the truck and I've had to replace the torque converter clutch solenoid. When the shop had the pan off the bottom they said everything was clean and looked good inside.

I intend to pull a 28 foot camper trailer that weighs about 8000 lbs. I have heard that I should pull in over drive and that I shouldn't pull in over drive. I've read both sides of that issue on this site.

So .................. ah, what should I do when I'm towing something? Do I leave it in OD or do I take it out of OD?

Register today or sign-in to remove these ads!

adrianspeeder · #2 11-14-2005, 08:41 AM

Howdy and welcome!

You don't have the E4OD, it was replaced in 1999 with the 4R100 which is an updated E4OD. The 4R70w is a light duty tranny. You might want to read through this thread...

Transmission Information Page

These trannys are ment to tow in any gear. Only lock out OD if it is hunting between 3rd and 4th. This usually happens in hilly roads, or driving at 45-50mph.

For that weight trailer, I would reccomend adding a tranny temp gauge...

This would allow you to be able to back off if the tranny hits over 200deg. The stock indash gauge is nothing but an idiot light with a needle and doesn't start to move untill you are already toast!

Adrianspeeder

SRockwood · #3 11-16-2005, 05:20 PM

You just want to avoid higher temps. If you see it shifting a lot between gears or see the converter slipping, then you want to take it out of OD. Note the unloaded cruising RPM in OD and 3rd at whatever speed you generally tow at and make sure it stays around there. If you see the RPMs go up, but not to where it usually is in 3rd, you want to take it out of OD. Prolonged driving with the converter slipping makes some big time heat.

93F150 · #4 11-19-2005, 08:55 AM

Yes, E40D and 4r100 are the same thing, just started calling it 4r100.

There were upgrades throughout the E40D' life and more upgrades in the 4r100.

4r70w came in 1/2 tons, cars, etc.

Sounds like you had a defective solenoid and should not be a concern with the transmission.