Overdrive Shimmy
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,741
Likes: 2,669
From: SE Florida
!
Once he defined what transmission he had I was able to offer a solution. Change the ATF. That's all it needs.
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Adding incorrect info to a problem is also no helpful, potentially more harmful than not contributing at all. As for myself when it comes to this issue I'll listen to those who've proven their input addresses issues based upon their experience.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
That applies equally to you as well!
Adding incorrect info to a problem is also no helpful, potentially more harmful than not contributing at all. As for myself when it comes to this issue I'll listen to those who've proven their input addresses issues based upon their experience.
Adding incorrect info to a problem is also no helpful, potentially more harmful than not contributing at all. As for myself when it comes to this issue I'll listen to those who've proven their input addresses issues based upon their experience.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I'm not trying to show others that I'm superior. I was only pointing out you are trying to solve the problem before you even know what the problem is! I still don't understand how offering a solution before the problem is even defined helps anyone other than your ego.
Once he defined what transmission he had I was able to offer a solution. Change the ATF. That's all it needs.
Once he defined what transmission he had I was able to offer a solution. Change the ATF. That's all it needs.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,562
Likes: 424
From: Long Island USA
Jumping in here before the moderator opens it back up 
The 4R70W was known for "lockup shudder" - the effect of the lockup clutch slipping at an uneven rate. I had it in my '96 T-bird 4.6L and the '97 Cougar in my sig. A change from the original MERCON to MERCON V solved it in both cases. The '96 t-bird, 10 years later, started doing it again, another fluid change, and it was gone again.
If the OP does indeed have a 4R70W tranny, the first best thing to do is change the fluid with MERCON V.
If that doesn't change anything, than it's possible it's either the lockup solenoid, or the torque converter.
Of course, if your profile is correct and you have a 1999 E350, I thought they had fixed the issues with that lockup shudder by then. Mark would know
The 4R70W was known for "lockup shudder" - the effect of the lockup clutch slipping at an uneven rate. I had it in my '96 T-bird 4.6L and the '97 Cougar in my sig. A change from the original MERCON to MERCON V solved it in both cases. The '96 t-bird, 10 years later, started doing it again, another fluid change, and it was gone again.
If the OP does indeed have a 4R70W tranny, the first best thing to do is change the fluid with MERCON V.
If that doesn't change anything, than it's possible it's either the lockup solenoid, or the torque converter.
Of course, if your profile is correct and you have a 1999 E350, I thought they had fixed the issues with that lockup shudder by then. Mark would know
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