1990 bronco problems

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Nov 24, 2003 | 09:19 AM

rusty1990351

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1990 bronco

Hi,
I have a 1990 351w fullsize bronco and It keeps make a vibration Usualy when I accelerate and I have changed all the u-joints and it still does this. I pretty sure it the rear driveshaft because I drove the truck around for five days and didnt do it with the the rear drive shaft out and it started as soon as I put it back in from changing the u-joint. so if anyone knows what it could be or I to fix it I sure would appreciate it.

Nov 24, 2003 | 10:20 AM

rusty1990351

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1990 bronco problems

Hi,
I have a 1990 351w Bronco. It keeps making this bad sound, well its actually more of a vibration when I start to acclerate. At first I thought that it was the rear u-joints going out so took the driveshaft out and had all of the ujoints changed, and while the rear driveshaft was out I had to have a way to get back and forth to work so I put it in 4x4 and sure enough whithin the four day period the rear driveshaft was out it didnt make the shuddering or the vibration when I was driving and that made me feel even more like the rear u-joint was where the problem was, well after I have the driveshaft put back in with the new u-joints It starts to vibrate again when I accelerate just like it did before.I'm really not this experinced with this part of a truck so If anyone knows whats causing this or how it can be fixed I sure would appreciate your help.and once again it a 1990 fullsize Bronco with a 351w and it has automatic locking hubs,if you need more information just ask.
thanks,
rusty

Nov 24, 2003 | 12:01 PM

Torque1st

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Hello-

Welcome to Ford Truck Enthusiasts! The Internet's leading Ford TRUCK and SUV Resource!

This thread has been moved from Garage and Workshop Tips forum where we share ideas about how to organize tools, heat the shop, or free that rusty bolt.

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-note- 2 posts combined and moved to proper forum from Garage and Workshop forum.

Nov 26, 2003 | 09:41 AM

kilted_drummer

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From: Pittsburgh (Iron City)

I have a similar vibration. It is during acceleration also. At first it appears to be the ujoints be cause it backs of when you let off the gas. I have checked them out and they seem fine. I am really starting to think it is engine bearings. I have 190k on it. What is the mileage on both your vehicles??

Nov 26, 2003 | 10:02 AM

Kemicalburns

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Joined: Jul 2002

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From: Bend,OR

you may want to check your pinion nut. they can losen up and cause such a vibration. are there any dents or dings in the driveshaft. if so it may need to be balanced or possibly get a new one.

good luck

Nov 26, 2003 | 11:00 AM

kilted_drummer

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From: Pittsburgh (Iron City)

what is the pinion nut?

Nov 26, 2003 | 11:03 AM

Kemicalburns

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Joined: Jul 2002

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From: Bend,OR

where your rear driveshaft connects to the rear axle. If you disconnect the ujoint from the rear diff there should be a Nut there that holds the pinion. who put the ujoints in? did you have a driveline shop do the work if so might take it back and have them check the balance .