What is the difference in these transmisions? I keep seeing my '08 Lariat (5.4L 4X4 SCrew) has a 4R75W, then I see it has a 4R75E. What do I really have? What is the difference in the two?

 

In all honesty...

Nothing different between them.

Darrrin

 

Some of the internals are stronger in the 4r75 than the 4r70.

 

Oh, absolutely.

There are no real differences between the 4R75E and the 4R75W though, other than what they are being called.

Darrin

 

You're right. I misread the question.

 

Thanks for all the replies.

 

I switched the two transmission but one has two and the other has one sensor so it's unplugged and now the expedition just stays in first doesn't shift gears at all . Is there a way I can correct this problem without spending a ton of money.

 

What year and engine is in the Expedition, and exactly what did the tranny come out of?

 

Switched which two transmissions? Specifics? Years?

D

 

It's a 5.7 3 v 2005 and the trans came from a a 2000 or 2001 f-150

 

It's a 5.4 3 v 2005 and the trans came from a a 2000 or 2001 f-150

 

That swap will not work. The older transmission is incompatible electronically with the needs of the computer in that vehicle.

While it is possible to do things to a newer transmission to use it on an older vehicle, unfortunately there is nothing you can do to the older transmission to make it work with the computer in a newer vehicle. That missing second sensor (turbine sensor) makes that impossible.

Sorry to be the bearer of bad news.

D

 

Darrin is correct... the output shaft ring gear is different on 2004 and newer 4R70E/4R75 and is NOT backwards compatible with 2003 and older vehicles.

2003 and older has 6 holes the speed sensor reads. 2004 and newer has 24 tabs the sensor reads.

Basically, your older engine computer will not be able to interpret the signal coming from the output shaft speed sensor as its reading 4X faster than the original.

 

Actually the ring gear is the easy part. Super simple to correct via a tune or somewhat harder if one might choose to disassemble and swap parts.

The much bigger issue that cannot be corrected is the turbine shaft sensor and everything relative to it. Totally impossible to add one to an older transmission.

D

 

completely correct..... I mis-read and thought he was putting a newer transmission in an older truck.

older transmission in a newer truck = no bueno!