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post #1 of (permalink) Old 12-14-2002, 09:24 PM
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Vibration/shudder

Been lurking in the background but now I have a question/problem. 1996 Bronco 351W E4OD, when disengageing cruise control from about 75 mph, there is a hard shudder or vibration from the drive train after about 1/2 to 1 second. It feels like I have drifted off the shoulder of the interstate and hit the "wake-up" grooves. This only happens when I turn the cruise off, not when I step on the brake. Any help will be greatly appreciated.

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post #2 of (permalink) Old 12-15-2002, 08:13 PM
 
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Re: Vibration/shudder

I think a bit more info. is needed.

It only happens when you take cruise off above 75? You never feel this any other time?

When did it start?

Have you or someone been doing any recent work on the vehicle?

etc.
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post #3 of (permalink) Old 12-15-2002, 08:28 PM
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Re: Vibration/shudder

Doesn't seem to happen at any other time and has only started the past couple of days. The only work that has been done is auto hubs replaced with Warn Premiums. The Bronco has 129*** on it. Everything has been lubed to the best of my knowledge.
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post #4 of (permalink) Old 12-16-2002, 03:15 AM
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Re: Vibration/shudder

the only thing i can think of is the torque convertor lockup clutch. FORD has a ton of TSBs on convertor shudder, which could be what's happening as the convertor locks up as the engine revs drop after turning off the cruise. the convertor lockup automatically disengages when you hit the brakes, so that could explain why it only happens when you manually turn off the cruise. if you tap the brake quickly as it starts to vibrate, and it stops, it's gotta be that convertor. a long term fix would be to rebuild the tranny and replace the convertor, but if it bothers you enough you could cut the lockup wire or wire a switch into it so you have better control of lockup. also, <a href=http://www.autotransinc.com/intercept.htm>Autotrans Inc</a> and Baumann have a couple products that are supposed to cure this problem.
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