1997 Ford F-150 vibration

Tiny
AEOLIANRANE
  • MEMBER
  • 1997 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
I have a vibration in the rearend I think. When I opened the dif to change the fluid I noticed the spider gears were tore up in the limited slip carrier. I found a open rear for the truck with the same gears and installed it. I had the vibration before I changed rears. The clutches also spun in the carrier. The rear that I installed had a little movement in the pinnion flange, I tightened it up just enough to stop the movement. Would the spider gears and spun clutches in the carrier make that vibration? Also when the trans shifts(4r70w)either down to 1st or up to 5th there is a pretty good vibration and clunck. All other gears seem to shift perfectly. Thanks for your help, good luck.
Wednesday, August 6th, 2008 AT 8:03 PM

5 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
So we are talking manual trans, not automatic? I take it the vibration is still there? Yes, a rear end problem like you describe will vibrate. You check the u-joints? WHen you say 5th do you mean converter lock up in OD? Could be a trans problem if it vibrates when it locks the converter. Any check engine light?
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Thursday, August 7th, 2008 AT 7:58 AM
Tiny
AEOLIANRANE
  • MEMBER
  • 16 POSTS
Sorry, automatic, should have said 4th. U-joints good already checked them. No check engine light. Idles great so I did not suspect converter. I don't completely understand converter lock-up operation. Educate me in simple terms.
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Thursday, August 7th, 2008 AT 10:31 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
After shifting into OD (4th) the converter will lock itself internally, it is a very slight rpm drop, and only at light /part throttle application, this drops the rpm's a little for better fuel mileage
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Thursday, August 7th, 2008 AT 11:18 AM
Tiny
AEOLIANRANE
  • MEMBER
  • 16 POSTS
I have a new of spider gears and I have a set of new clutches form ford racing. When I get all installed in carrier and rear end back in truck I will let you know what happens. Hope it will fix all problems. Thanks for all help!
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Thursday, August 7th, 2008 AT 12:55 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
No problem. Let me know how it works
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Thursday, August 7th, 2008 AT 5:22 PM

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