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Old 07-12-2011, 09:31 PM
BLD BLD is offline
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Possible Trans issue?...I'm stumped!

I'm having an issue with my truck. It's an '04 F-250, 6.0, auto that has a little over 63,000 miles.

When accelerating from a dead stop it used to have a clunk feeling at about 2 or 3 mph. It felt like the TC was fully engaging heavily but I'm not sure. You could feel it more the slower you accelerate.

Now when I accelerate, it feels like it's not fully engaging the gear and it kind of jerks for a moment until we start rolling. From there it shifts just fine through all the gears, until I hit highway speed (50-65). I can feel it kick into OD, where before all I'd ever notice is that the RPMs dropped a little.

When slowing down everything is normal until right before I stop. It feels like the transmission is fighting to downshift. I've also noticed that there is a bit of delay from when I shift, to when the truck actually shifts (usually in and out of park or reverse).

For what it's worth, I've also noticed that when I shift it into third gear from a stop, it won't start in first gear. It just wants to stay in third. When I'm stopped in park and shift into first gear the truck will feel like it's pulling, similar to partially engaging and disengaging a clutch in a manual (short and jerky). It only happens sometimes, and there is no rhythm to when it does it. Also, my tow/haul button rarely works when I push it.

I don't know much about automatic transmissions, any input would be appreciated. I'm probably going to have it looked at this weekend, but would like to know what I'm up against before I take it to anyone.

Last edited by BLD; 07-21-2011 at 05:01 PM.
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Old 07-21-2011, 05:11 PM
BLD BLD is offline
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Update

I just got my truck back today from the shop. They had a heck of a time diagnosing the issue, and decided that it was the OD solenoid that needed to be replaced...It seems like that's not the problem.

The night I dropped it off they said they were barely able to limp the truck into the shop as they were closing. The next morning it drove great without showing any symptoms. They dropped the pan expecting the worse, but found the fluid and filters clean and in great shape.

On my way home I noticed that the truck felt a little different, but by the time I got home (rough 45 minute drive) The truck was exhibiting the same issues. When accelerating from a stop it feels like trying to accelerate with a wore out clutch in a manual. Once in gear and moving it shifts just fine. When I went to back it into my driveway it took several seconds longer to shift from drive to reverse than it usually does. When it finally shifted it did it way harder than it used to, and probably much harder than it should.

I'm calling the shop tomorrow, but I could really use some help getting to the bottom of this one. I'm hoping it's a simple issue that can be resolved before the problem takes out my whole transmission.

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