6 speed problem - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 02-23-2010, 09:55 PM Thread Starter
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Unhappy 6 speed problem

Hey I'm new to this 6 speed manual in my 2006 with 34,000 miles. It doesn't do it everytime, but there are time when it doesn't want to shift to 3rd without clashing. I've tried shifting slower, faster, and nothing seems to matter. When it wants to do it it just does it. It is perhaps more frequent when extremely cold, but does it hot too. It never has done it from 4th to 3rd, only 2nd to 3rd. Otherwise, I love this truck! This engine has a bad rap I don't think it deserves.

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post #2 of 7 Old 02-23-2010, 10:15 PM
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Mine was doing the same thing going into 2nd for the longest time for about 1 time outa 30 or so... and now it also does it going into 3rd. i might be wrong here but i would think the syncro could be going bad


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post #3 of 7 Old 02-23-2010, 10:21 PM
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Sounds like a sychro going bad. If you float the gears you won't have a problem getting it in. F.Y.I. Floating the gears is not using the clutch

Early 99 F-350 CC LB 6-speed
Stock with mods

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post #4 of 7 Old 02-23-2010, 10:37 PM
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Syncros bad. Brothers 6 speed did the same exzact thing. 2nd to 3rd only.
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post #5 of 7 Old 02-24-2010, 08:59 AM Thread Starter
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That's what I was afraid of. Are the syncros weak in this transmission? Has anyone replaced them before, and if so how much of a job is it to do? I've only done that on older cast iron transmissions and tractors. Is this tranny pretty straight forward like the old ones?

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post #6 of 7 Old 02-24-2010, 03:53 PM
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What are you calling clashing? ZF-6's are NOT the smoothest tranny's to shift in the first place. I'vee never driven one that wasn't notchy. If it's actually grinding you have worst case synchronizer problems best case shift fork problems.

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post #7 of 7 Old 02-24-2010, 05:41 PM Thread Starter
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It just grinds into gear briefly on occasion. The rest of the gears feel fine. Yeah it's not the smoothest tranny I've driven, but I wouldn't think that it would be needing help at 43000 miles. I've concidered maybe changing to a full synthetic oil for the hell of it since it's not a regular problem, but I don't know if that would do anything. Just thought it might be worth a try before I go tearing into my trans.

2006 F-250, S&B cold air, 4" turbo back, edge platinum
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