Darrin, could it possibly be an AODE?

 

I guess it could be, but that would be bad. A 4R70W and an AODE are not a direct swap because the transmissions have gearsets with different ratios. The 4R7x series has a "wide ratio" gearset and the AOD, AODE does not. That creates a problem with a swap between the two because the computer is set up to work with with a specific set of gear ratios. What happens is that the transmission will only work for a short time before the computer burns it up. It will never shift right, but it might not throw a code on an older vehicle like this either.

So yeah, that might be. The case casting number will tell me something when he gets that.

Darrin

 

Hi Darrin. The transmission DOES have the sensor. I'm working on the casting number, it's kinda hard to see with all the oil and gunk on it. I will get it to you ASAP.

 

Darrin, the reason I'm thinking AODE is the 4R70W wasn't around yet in 1991, and the tranny is allegedly out of a 1991 E-150. From the description given so far (14 bolts), it ain't a E4OD.

 

They didn't put the AODE in a 91 E series though. The only choices there are E4OD, AOD and C6.

Darrin

 

Hi, I've got the casting number. Sorry it took so long but I work 2 jobs and I had to clean the tranny. The casting number RF-F4ZP-7006-AA.

 

Huh, that is the right case code for the 95 4R70W that would have come in that truck.

On the other side of the case, right back from the transmission lines, is a plate that will have more info on it. Can you get anything off of that? You are probably going to have to wipe it off. That one gets messy often times on the older vehicles if they have been leaking anyhing at all.

Darrin

 

I'm starting to think that it's the right tranny for my truck. Where is the plate? Directly on the other side? What info do you need off of it?

 

Darrin, the plate on the other side says "Do not Remove" and below that it says AODE/W.

 

Hi, Darrin. Do you have any idea what might have caused the thrust bearing to fail?

 

Darrin said this:

 

So I should replace the torque converter?

 

Oh heck yeah, you must replace the torque converter if you are positive that the thrust bearing was taken out ththat way.

Darrin

 

Ok, so it sounds like it's the right tranny for my truck, right? I will change the torque converter and add an extra tranny cooler with bigger lines and replace the modulator. Thanks for all your help and advice guys! I appreciate it.

 

Modulator? It's an electronic tranny.