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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.