Ford 7.3L Power Stroke (1999-2003) :: Trans Not Locking In 1st Correctly


Aug 15, 2016

I bought this truck with 200000 miles and its been flawless, its now 900 short of 600000.. I use it to haul everyday.. nothing heavy mostly a car or truck and every once in a while a skid steer. I got 560000 out of my trans, i take it easy. lol

at 350k I installed a Jw valve body drilled pump, tripple disc converter and solenoid pack.. at 560k it went, i pulled it and brought to a guy i trust as much as you guys trust BDS.. Ive had what Ive called a vibration since day one, could be a shudder, could be a shimmy.. what ever.. I brought it back and he says nothing would do that from a trans, so I went through drive shaft, new t case ripped apart rear end and its still there and I have just been dealing with it.. about 2 months ago it started acting up in first. when I pull down to drive I get the normal bump and start to go, it feel like the truck slows, then another bump and it climbs normally with the shudder.

took it back and he said maybe a stuck valve in small VB, so I pulled it and went down there and it was fine, I reinstalled and still does same thing. I then put a pressure gauge on it and it swings as it should sits around 70 psi and will climb, only in first it will climb and fall back to 70 like a switch was flipped, and the rest of the gears bleed off slowly or normally.. He then said it could be the big valve body, so I swapped that one out with another and no real change, maybe its a bit more noticeable.

I am at a loss. Could this be loose feed bolts? Could the shudder that I can feel at most speeds be the 1 gear slipping a tiny bit all the time? I am told that first gear is always on.. this truck has been a dream until this trans issue..

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So putting the new extended links on my truck, not sure if they are supposed to be seated flush on both the frame and sway bar itself before tightening them down. This is how they are sitting now --

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Ford 7.3L Power Stroke (1999-2003) :: OD Light Blinking - TC Not Locking

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Ford 7.3L Power Stroke (1999-2003) :: Manual Locking Hubs Advantage Over OEM?

As my truck stands it has OEM automatic locking hubs with a selector for auto or lock. So, why would some one buy manual locking hubs and cap off the ESOF vacuum line when the OEM ones perform the same function by being auto or locked?

I hope this makes sense because if I felt I wanted to go to manual style locking hubs, I think I could simply cap off the vacuum line and then switch the hub to lock if I wanted 4x4 because the electric switch inside the truck is actually what engages the transfer case and puts the truck into 4x4.

Is this thinking/theory correct or am I missing something here?

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Ford 7.3L Power Stroke (1999-2003) :: 1996 F250 - Locking Hub Fell Out

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Ford 7.3L Power Stroke (1999-2003) :: Switch From Manual To Auto Locking Hubs?

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Is it a difficult change?

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Ford 7.3L Power Stroke (1999-2003) :: Trans Will Engage When RPMs Get Over 2K

Have to get rpm's over 2k before trans will engage, then in between shifts I either have to let off throttle or let engine rev over 2k to get trans to shift...

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Ford 7.3L Power Stroke (1999-2003) :: Trans Grinding Intermittently?

I'm getting a sound every now and then of what sounds like i'm running over rumble strips on the side of the highway. I'm guessing it's the trans grinding. Any thoughts?

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Ford 7.3L Power Stroke (1999-2003) :: Trans Temp Really High?

I notice my trans temp gets really hot fast. For instance just moving my trailer from front of my house to side yard makes temp go to 250. Without any load and driving a couple miles it does the same thing. It's been doing it since I installed the trans temp gauge just trying to figure out what's up.

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Ford 7.3L Power Stroke (1999-2003) :: Max Trans Temp And Its Duration?

I've searched, and gone back through my computer history and can't find it. I have seen a thread here which Mark contributed too which said what the max temps were and for how long etc. I know book is 230 and optimum is around 165 but there was some degree of play in that.

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Ford 7.3L Power Stroke (1999-2003) :: Blown Trans From Torque Converter?

So my transmission drove perfectly fine I just wanted to put an upgraded torque converter in especially after driving a customers' truck with a low stall converter. I know their not like for racing or anything but it's a work Truck with some mods to the motor nothing crazy. So I went ahead and bought a low stall triple disk converter and I drove around the block fine and went to go on the freeway and got into fourth but lost it as I hit 75 (was not flooring by any means and had it in the stock tune) now it will not go past second gear. Once it did this the o/d off light started to flash and I decided to do a stall test.went to 1800 in a Second. Suppose to stall around 1200-1300.

2000 f250 7.3 powerstroke dp chip stage 1 camshaft and 180/100 injectors coming at some point but stock for now

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Ford 7.3L Power Stroke (1999-2003) :: OD Flashing When Driving After New Trans 4r100

Well stock trans went two weeks ago so warranty company had another stock one put it (4r100). Finally got the truck today and I noticed my overdrive was flashing. I have no issues though shifts fine speedo works Rpms are normal I checked fuse 19 under the dash that's fine so I'm lost

If I turn the key on I can use the button like normal but once I drive it just flashes. It works but flashes .

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Ford 7.3L Power Stroke (1999-2003) :: Trans Torque Converter Rattle

1999 7.3/4r100 4wd with the rattling torque converter.

I bought this truck 10-11 years ago to use as a tow rig for my landscaping company. It has been a great problem free truck, I have done brakes a few times, a water pump, ball joints but no issues with motor/drivetrain.

I don't know the history of the trans before I purchased. Ford didn't have history of it being replaced and even now it still has all the labeling on the case. I would have thought it would have been washed off in a rebuild. Again I don't know. When I bought the truck it shifted nice and crisp, having owned trucks before it made me think it had been rebuilt but this was my first and only 4r100. Other trucks are ZF6 manuals.

Anyway 10 years and 100,000 miles later it still shifts very crisp and fluid, has been changed a couple times, is nice and cherry red. I added a 6.0 cooler, temp gauge and filter. Never see the temp rise and haven't seen much in the filter.

About 25,000 miles ago the TC started to rattle, a known 99 problem. I figured surely the trans would go and I would do a rebuilt from Ford. It keeps going though so being a work truck I have kept running it.

A couple weeks ago the starter just spun and wouldn't engage. I pulled the inspection cover and noticed some missing teeth on flex plate. Got it to start my turning crank bolt a bit to good teeth and the starter caught. Now we are carrying a breaker bar and socket. It has happened a few more times so I need to replace flex plate.

Question is, since I need to pull trans to replace flexplate, should I replace TC (I would like to get rid of the noise)? Some people have said I will be replacing trans in a couple months if I mess with it. They say just spend $3000 on a rebuilt now with a converter. Not trying to be cheap but hate to just dump this trans that is still working great and has served me well.

I have replaced many transmission and done clutches in many trucks so I am familiar with the steps of removal and installation, just stuck on what I should do.

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Ford 7.3L Power Stroke (1999-2003) :: 6 Speed Trans - Stuck In 6th Gear (Overdrive)

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