Trans shudder
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Cross-Country
Joined: Jun 2010
Posts: 68
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Trans shudder
06 with 5.4 and AT. It shudders in overdrive during light to no acceleration. I was told it was the converter. I was also told by a technician in a trans shop that the Trans-X additive for hypoid oil in a posi-trac was ok to use even though the back of the tube says "Not safe for automatic transmissions". Does anyone know if this is accurate or if the guy was just blowing smoke? Thanks
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,569
Likes: 62
From: North Georgia
I have used additive for the posi trac differential before and it did work, but I would recommend just changing the fluid first, most of the time that will fix a mild converter shudder.
Posting Guru
Joined: Sep 2007
Posts: 1,715
Likes: 2
From: Seneca, SC
x2 on this. I had a pretty bad TC shudder in my 01 7.3 and a fluid and filter change made it go away. Although, the tranny did end up blowing out about a year later. It didn't have anything to do with shudder though.
Trailering
Joined: Jul 2005
Posts: 19
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The 2007 I am test driving right now does this as well. I noticed this accelerating from 40. It has me a bit concerned.
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Cross-Country
Joined: Jun 2010
Posts: 68
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I would inform the dealer and let them know that it has to be fixed before you consider a purchase.
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groggf250
1987 - 1996 F150 & Larger F-Series Trucks
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Feb 13, 2010 03:44 PM
sharky
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Jul 13, 2009 09:56 PM
