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My truck vibrates at 45mph

Tiny
RED_DOG0316
  • MEMBER
  • 1945 FORD F-150
I have a 94 F150 4+4 pickup, extended cab, 5.0 engine, auto matic with overdrive. 163000 miles in good condition. My problem is that when driving I hit 45 the truck starts to vibrate loudly and continues to do so till I let up on the gas. It will not do it when maintaining speed only when the gas is accelerated. I have replaced the universal joints and have checked out the front end and found nothing wrong. I cant see anything wrong with the driveshaft it looks in good condition. What could it be? And is it safe to drive like this?
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Wednesday, February 14th, 2007 AT 11:13 AM

3 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Do you have a carrier bearing inline with the driveshaft? IF so, check it for sagging in the web area outside of the bearing.


https://www.2carpros.com/forum/automotive_pictures/30961_30961_carrier_1_1.jpg

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Wednesday, February 14th, 2007 AT 5:51 PM
Tiny
RED_DOG0316
  • MEMBER
  • 2 POSTS
I've learned the truck doesnt vibrate if you slowly gain speed and leave the overdrive off. Normally I kick the overdrive on at 45mph and thats when it vibrates. Since I have been leaving it off and slowly gaining speed it doesn't vibrate. Any ideas what could be wrong. Recently replaced universal joints int the drive shaft.
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Monday, February 19th, 2007 AT 7:43 AM
Tiny
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I missed the part about whether you have a carrier bearing.
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Monday, February 19th, 2007 AT 5:19 PM

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