expedition 4r70w 4th gear issues
#1
expedition 4r70w 4th gear issues
Hello everyone,
I have a 2005 ford expedition with 91000 miles, it has the 5.4 w/ the 4r70w transmission.
For some reason when my truck tries to shift into 4th gear, the RPM's climb to approx. 3000 rpms (meanwhile the truck is not gaining speed) and slowly drops down to about 1000-1500. once the rpms drop down fourth gear eventually engages and I can go about my business as normal as long as I do not let my mph drop too low.
If I turn O/D off, the truck drives perfect, minus not having overdrive.
If I come to a dead stop and put the truck in 2nd gear, with O/D on the truck drives great and it has good engine braking so I am assuming that the band is holding.
I took it to a transmission shop to have some diagnostic checks done, they told me that fourth gear was barely engaging and that they would have to tear apart the transmission to diagnose it further, I told them not to disassemble the transmission.
So I changed out the torque converter (which I assumed was "fourth gear") and changed out all the fluid, the fluid looked a little burnt but there was no debris in the pan but there was some silver material on the tranny pan magnet, and installed a new filter. and the problem still exists. I am stumped and was hoping someone could provide a little insight.
I have a 2005 ford expedition with 91000 miles, it has the 5.4 w/ the 4r70w transmission.
For some reason when my truck tries to shift into 4th gear, the RPM's climb to approx. 3000 rpms (meanwhile the truck is not gaining speed) and slowly drops down to about 1000-1500. once the rpms drop down fourth gear eventually engages and I can go about my business as normal as long as I do not let my mph drop too low.
If I turn O/D off, the truck drives perfect, minus not having overdrive.
If I come to a dead stop and put the truck in 2nd gear, with O/D on the truck drives great and it has good engine braking so I am assuming that the band is holding.
I took it to a transmission shop to have some diagnostic checks done, they told me that fourth gear was barely engaging and that they would have to tear apart the transmission to diagnose it further, I told them not to disassemble the transmission.
So I changed out the torque converter (which I assumed was "fourth gear") and changed out all the fluid, the fluid looked a little burnt but there was no debris in the pan but there was some silver material on the tranny pan magnet, and installed a new filter. and the problem still exists. I am stumped and was hoping someone could provide a little insight.
#2
The torque converter is NOT fourth gear. That was a waste of money.
You have a problem with the overdrive band. That band engages fourth gear. There is a clip in the overdrive servo which applies the overdrive band. This clip often breaks and overdrive will do what you're seeing. It and could also be burnt.
You have a problem with the overdrive band. That band engages fourth gear. There is a clip in the overdrive servo which applies the overdrive band. This clip often breaks and overdrive will do what you're seeing. It and could also be burnt.
#3
darn, thanks Ford dealership for telling me that the O/D is "4th gear".thanks for clearing that up for me Mark. would it be worth changing out the band, or just getting a remand transmission? I knew I screwed something up when I was towing my 4k lb travel trailer with the O/D on. Expensive lessons I tell ya.
#4
#6
#7
Join Date: Jun 2003
Location: Somewhere Saskatchewan
Posts: 2,982
Likes: 0
Received 5 Likes
on
5 Posts
AAMCO? I wouldn't let them flush my toilet.
Trending Topics
#8
Thread
Thread Starter
Forum
Replies
Last Post
Goody2888
1997-2006 Expedition & Navigator
5
11-29-2023 08:25 PM
indocat
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
4
12-01-2004 09:40 PM