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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Hard 3rd->4th gear shift?

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Old Apr 30, 2010 | 12:44 AM
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Hard 3rd->4th gear shift?

I have a predictable hard shift from 3rd to 4th gear at exactly 35mph on partial throttle.

Engine spins up to approx 2Krpm then it drops into 4th with a lurch.

you guys feel the same?

I have 3.55 gears and the truck is still bone stock. 9Kmiles on her now. It's been like this since I got it new
 
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Old Apr 30, 2010 | 06:43 AM
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From: Frederick, MD
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could it be the torque converter lockup? Does the RPM's drop down to around 1500?

Lurch being like all of the sudden you gain some speed too?
 
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Old Apr 30, 2010 | 12:37 PM
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1st-3rd feels like they're geared really low. I can sense the shift points are at 25, 35, and 45mph with medium throttle and no load on a flat road. I can't seem to feel the shift from 1->2 assuming it starts out in first.

Once it shifts into 4th, rpms drop and then the truck feels like it just woke up and starts accelerating with some real gusto. The shift between 1->2->3 and 4->5 are pretty smooth with the same amount of throttle. 3->4 is very different.

I don't think there's a mechanical problem.. Maybe just some fine tuning of the shift is needed in the PCM? dunno.
 
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Old Apr 30, 2010 | 12:55 PM
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From: Frederick, MD
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nope....you have just experience the wonder of torque..your tq locks up and away you go.

Now you know what you have been missing.
 
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