AODE/4R70W shifting problems
Thread Starter
|
New User
Joined: Oct 2006
Posts: 5
Likes: 3
AODE/4R70W shifting problems
Having shifting problems with a 1995 F150 with the AODE tranny. The other morning, backed out of my driveway and drove down my road. Got to a stop sign, went to leave it and had no forward gears. Was able to back up my road and back in my driveway. Got home later and started the truck again, still no forward gears. Pushed the 4x4 button, and my forward gears all returned. Put it back in 2wd and drove up and down my road. Punched the gas and it peeled out all the way down the street. Got back to driveway, came to a stop, lost all forward gears again.
So by process of elimination, if it moves and drives I would think I could rule out mechanical breakage in tranny. I would say the pump, torque converter, and clutches are fine because when it does work it shifts good and there is no slippage. I'm thinking something is sticking or plugged in the valve body. And yes, I checked the fluid level first.
Any input from the tranny gurus before I pull the valve body out?
So by process of elimination, if it moves and drives I would think I could rule out mechanical breakage in tranny. I would say the pump, torque converter, and clutches are fine because when it does work it shifts good and there is no slippage. I'm thinking something is sticking or plugged in the valve body. And yes, I checked the fluid level first.
Any input from the tranny gurus before I pull the valve body out?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
If park works when you don't have forward gears that rules out the transfer case.
There is nothing in the valve body that could cause the loss of all forward gears. I suspect a major pressure leak inside the trans. The next step in the diagnosis is to put a pressure gauge in the test port and see what the pressure is when you don't have forward gears.
There is nothing in the valve body that could cause the loss of all forward gears. I suspect a major pressure leak inside the trans. The next step in the diagnosis is to put a pressure gauge in the test port and see what the pressure is when you don't have forward gears.
Thread Starter
|
New User
Joined: Oct 2006
Posts: 5
Likes: 3
If park works when you don't have forward gears that rules out the transfer case.
There is nothing in the valve body that could cause the loss of all forward gears. I suspect a major pressure leak inside the trans. The next step in the diagnosis is to put a pressure gauge in the test port and see what the pressure is when you don't have forward gears.
There is nothing in the valve body that could cause the loss of all forward gears. I suspect a major pressure leak inside the trans. The next step in the diagnosis is to put a pressure gauge in the test port and see what the pressure is when you don't have forward gears.
And at this point, if it's going to be an internal pressure leak, the trans is coming out anyway, correct?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
That's correct.
2nd Gear
Joined: Jul 2024
Posts: 2
Likes: 1
Partially clogged EPC solenoid?
I have the same issue with my 95 f150 5.0l rwd with a 4r70w tranny. I suspect it is a partially clogged EPC solenoid. I ran line pressure tests that increased with filter change, valve body change, TCC/shift solenoids cleaning/testing. The EPC was in resistance range, but I forgot to clean it, test it for movement. The servos were seated properly, snap rings were intact so I didn't fuss about them. I know my Torque converter is worn and contaminated the fluid since why I think the EPC solenoid could be an issue. When you WOT it will not slam back into gear and go, complete lack of movement in forward, but reverse moves albeit slowly. My pump is fine because the pressure increased at WOT a lot when the filter was clogged but the range is still too low for the forward gears. I need my vehicle to be well again ASAP. Any suggestions? Could this be from a completely dead torque converter? Would that cause a significant drop of pressure in the forward gears only? Also when I first had the valve body changed I was able to drive it for a mile then I came to a stop sign and then nothing, back to square one.
Last edited by Rock123; Dec 24, 2025 at 03:26 PM. Reason: Too vague
Trending Topics
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
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
Thread
Thread Starter
Forum
Replies
Last Post
seancrawford14
Clutch, Transmission, Differential, Axle & Transfer Case
4
Apr 12, 2012 10:09 AM
fordinmudd
Clutch, Transmission, Differential, Axle & Transfer Case
6
Jun 16, 2005 03:17 PM