Overdrive and hard shifting
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Senior Member
Joined: Apr 2006
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From: Manassas, VA
Overdrive and hard shifting
Okay guys here is what I have:
1997 F-150 4x4 with 116,000 miles on it.
The problem is:
The overdirve light started flashing on my way into the office and it started shifting hard as hell through all gears including reverse. I could use any help that anyone can provide. I have had no tranny issue's since buying the turck 8 months ago. 4 wheel drive works fine it just shifts hard like when it is in 2 wheel if that will help. Also there are no service lights that came on when the light started flashing.
1997 F-150 4x4 with 116,000 miles on it.
The problem is:
The overdirve light started flashing on my way into the office and it started shifting hard as hell through all gears including reverse. I could use any help that anyone can provide. I have had no tranny issue's since buying the turck 8 months ago. 4 wheel drive works fine it just shifts hard like when it is in 2 wheel if that will help. Also there are no service lights that came on when the light started flashing.
Senior Member
Joined: Dec 2004
Posts: 5,003
Likes: 27
From: Dover AFB DE / Harrisburg PA
The OD light flashing is the tranny service light, so you need to pull the codes to see whats up. Hard shifting is the default limp mode. What is the trans code on the door jam sticker? E or U?
Adrianspeeder
Adrianspeeder
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Senior Member
Joined: Apr 2006
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From: Manassas, VA
Well I have gotten my truck back from Ford and what they told me was a little puzzeling they told me that the Torque converter slipped. From what I know the converter can not slip, but what do I know that is why I am here. So with 117K they told me I should not only replace the converter but the whole tranny.
Not satisfied with that 3200 resolution to my problem I took it to Cottoman Transmission and they told me tey couldn't find anyting wrong with it after a 21 point tranny inspection. They told me to drive it until is shows more signs of problems and then they could give a better diagnose's.
Any feedback from my firends on this forum on what could be the problem with my tranny or if I should just run it like I did before instead of babing it like I have sence the lights went flashing.
Not satisfied with that 3200 resolution to my problem I took it to Cottoman Transmission and they told me tey couldn't find anyting wrong with it after a 21 point tranny inspection. They told me to drive it until is shows more signs of problems and then they could give a better diagnose's.
Any feedback from my firends on this forum on what could be the problem with my tranny or if I should just run it like I did before instead of babing it like I have sence the lights went flashing.
Senior Member
Joined: Oct 2002
Posts: 7,295
Likes: 125
From: St. Louis (Out in the woods)
I'm guessing they pulled a P1744 code. Have you had any probelms with the engine stalling or stumbling when you shift into REVERSE?
If so, there are several things in the E40D that can cause this.
The line-lube pressure regulator valve may be intermittently sticking due to bore or valve wear. This is located in the pump body and requires that the front end of the tranny be disassembled.
The line pressure modulator valve may be sticking. This one is in the valve body.
The TCC valve in the pump housing may be worn and oscillating/sticking. This causes a loss of hydraulic pressure for the TC clutch and causes the TC to slip.
These conditions are often detected by the computer. It responds by maxing out EPC pressure which causes the harsh shifts, hopefully allowing the vehicle to limp to a service facility before it self destructs.
I can guaratantee that if you take the truck to AAMCO, they'll find something that will require a rebuild. AAMCO= All Automatics Must Come Out....
You could get by with a new TC, a rebuilt VB with Sonnax valves, and a few Sonnax items in the pump assy. This is still going to be expensive since the tranny has to be pulled. Of course, the rest of the tranny has 116k of miles on it so this might result in having to rebuild the whole thing anyway a few miles down the road. That's why the Ford dealer suggested a complete rebuild.
In order to diagnose the fault, a transmission shop will need to catch it in the act most likely. You may be able to find a very experienced specialist who can likely diagnose it specifically based on hydraulic pressure readings and diagnostic tests.
In any event, your transmission is not going to be cheap. Let us know what happens.
Steve
If so, there are several things in the E40D that can cause this.
The line-lube pressure regulator valve may be intermittently sticking due to bore or valve wear. This is located in the pump body and requires that the front end of the tranny be disassembled.
The line pressure modulator valve may be sticking. This one is in the valve body.
The TCC valve in the pump housing may be worn and oscillating/sticking. This causes a loss of hydraulic pressure for the TC clutch and causes the TC to slip.
These conditions are often detected by the computer. It responds by maxing out EPC pressure which causes the harsh shifts, hopefully allowing the vehicle to limp to a service facility before it self destructs.
I can guaratantee that if you take the truck to AAMCO, they'll find something that will require a rebuild. AAMCO= All Automatics Must Come Out....
You could get by with a new TC, a rebuilt VB with Sonnax valves, and a few Sonnax items in the pump assy. This is still going to be expensive since the tranny has to be pulled. Of course, the rest of the tranny has 116k of miles on it so this might result in having to rebuild the whole thing anyway a few miles down the road. That's why the Ford dealer suggested a complete rebuild.
In order to diagnose the fault, a transmission shop will need to catch it in the act most likely. You may be able to find a very experienced specialist who can likely diagnose it specifically based on hydraulic pressure readings and diagnostic tests.
In any event, your transmission is not going to be cheap. Let us know what happens.
Steve
Thread Starter
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Senior Member
Joined: Apr 2006
Posts: 189
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From: Manassas, VA
I have no stalling or stumbling issue with my truck. It has been two weeks since the tranny acted up. Since my tranny is so expensive ayway I am going to run it until I burn the tranny down and make the new tranny worth it. You know what I mean?