Transmission nock
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Mountain Pass
Joined: Mar 2009
Posts: 134
Likes: 2
From: Kansas
Transmission nock
On my 2001 Super Duty 4x4 with the 5.4 auto trans. when I let it set for a while(even just over night) when You put it in gear for the first time it nocks about five times. The first time it done it I thouhgt it was the engine. I had my foot on the brake and put the truck in drive. It started nocking. I looked at the oil pres. and it was fine. I put the truck in neutral and it quit nocking. Put it in drive and it nocked about 3 more times and quit. It only seems to do it on initial engagement of the trans. It nocks about 6-8 times and then quits. It never slips or hesitates or anything else abnormal. The nock does increase with engine speed and sometimes has a bit of a squeak with it.
Could the torque converter bepartialy locked? The truck has 116,000 miles on it. I have only had the truck for 1200 or so of theose miles so I have no idea what has been done to the tranny(flush, filter, fluid). I was hoping some one had been through this, but if not I will prolly just drive it and do the routine tranny fluid flush and change at the next scheduled interval. I think that is at 120,000 if I remember right.
Could the torque converter bepartialy locked? The truck has 116,000 miles on it. I have only had the truck for 1200 or so of theose miles so I have no idea what has been done to the tranny(flush, filter, fluid). I was hoping some one had been through this, but if not I will prolly just drive it and do the routine tranny fluid flush and change at the next scheduled interval. I think that is at 120,000 if I remember right.
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Mountain Pass
Joined: Mar 2009
Posts: 134
Likes: 2
From: Kansas
I figured this out over several mornings because like I said it only knocks 6-8 times per morning. Then it won't do it again until the next morning.
I will get under there and look at the slip yoke and carrier bearing( if it has one) but I don't think that is it since it does it without the drive shaft turning.
Knock sounds very familiar but I just can't place it. All I have ever been around is pre 1990 until this trcuk so I am learning loads. Help guys I need you. Thanx
Elder User
Joined: Oct 2006
Posts: 835
Likes: 1
start with your fluid. mark kovalsky has a write up on flushing trans fluid on the 4r100. im not sure but i believe that the 01 has a drain plug on the torque converter. take the rubber plug off the bottom of the trans by the bellhousing and see if you cant locate that plug. btw the trans pan has a reusable gasket. but get a new filter!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,740
Likes: 2,669
From: SE Florida
I don't think a fluid change will help. It could be a cracked flex plate, though I don't know why it only does it on the first engagement. Will it knock in reverse, or only in drive?
Thread Starter
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Mountain Pass
Joined: Mar 2009
Posts: 134
Likes: 2
From: Kansas
I have never noticed in reverse but I will try that the next couple mornings and see if I can get it to do it in reverse.
