E40D shifting rough in 1 gear

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Oct 21, 2009 | 05:31 PM

MrRogers

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From: Olathe, KS

E40D shifting rough in 1 gear

Howdy fellas,

This one is a little bit queer. My tranny works ok (a little hesitation or some rough downshifting every now and then) but from 3-4 it's really bad. So bad I've replaced front and rear U-joints twice in 3 years. If I accelerate to 35 mph (1500 rpm) and let off the gas it shifts really rough and you can hear a clunk. But, if i accelerate through to 47 mph (~2100 rpm) it'll shift smoother. Just so I'm explaining this clearly: It shifts really rough from 1500 to 2100 rpms. All the other gears are as healthy as can be expected from a tranny w/ 260k on it. I was thinking about replacing the MLPS but wanted to get some opinions.

Thanks,

Josh

Oct 21, 2009 | 05:32 PM

MrRogers

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From: Olathe, KS

Forgot to mention: No codes thrown

Oct 21, 2009 | 09:17 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

It could be a damaged trans or motor mount. It is almost certainly not the MLPS. That would cause no shifts or harsh shifts at any speed.

Oct 21, 2009 | 10:51 PM

MrRogers

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Senior User

Joined: May 2007

Posts: 224

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From: Olathe, KS

yeah i was afraid of that...oh well. Guess I'll spend the money and get it looked at

Oct 27, 2009 | 08:35 PM

archangel

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Joined: May 2003

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From: Joliet, Illinois

Also, internal wear between the forward drum and the center support can cause a real harsh 1-2 shift.

But the F.I.P.L is the main cause of most shifting issues.

I would not spend a dime having anything checked out (other than the fluid level as you can do it yourself) unless I replaced the F.I.P.L. first.