4R70W transmission shifts up and down on its own - why?
Thread Starter
|
New User
Joined: Jan 2003
Posts: 6
Likes: 0
4R70W transmission shifts up and down on its own - why?
I have a 98' Mountaineer and about 400 miles after changing the fluid it started shifting up and down on its own from high gear down and then right back into high.
It feels like its searching for the right gear to stay in.
Would this problem be fixable without pulling the tranny??
Any good ideas??
Thanx!
It feels like its searching for the right gear to stay in.
Would this problem be fixable without pulling the tranny??
Any good ideas??
Thanx!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
4R70W transmission shifts up and down on its own - why?
It could be a failing Transmission Range Sensor (TRS.) It's mounted on the driver's side of the transmission, where the shift cable attaches. As it wears out it tells the computer that you moved the shifter to N, so it shifts the transmission to N!
A new one is just over $100 installed, but it isn't very hard to install yourself, if you are so inclined.
A new one is just over $100 installed, but it isn't very hard to install yourself, if you are so inclined.
Junior User
Joined: May 2006
Posts: 54
Likes: 0
I have a 4r70 that I just installed in my ranger along the engine, all 98 stuff, goes into reverse and drive great just won't shift up now, I am getting p0707 and p0500 codes, trans range sensor low input and veh speed sensor A malfunction,,,any ideas? This engine came out of a Mounty with ABS my ranger only has rear abs could this cause a conflict?
Trending Topics
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
P0500 means that the PCM isn't seeing the input from the vehicle speed sensor that it expects. It could be an incompatibility between the two systems.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
jpatt504
1999 - 2003 7.3L Power Stroke Diesel
2
Feb 27, 2017 08:37 PM
Bigblockboy
Clutch, Transmission, Differential, Axle & Transfer Case
3
Apr 10, 2016 01:17 PM
Ken Blythen
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Mar 30, 2009 12:57 PM
