Mechanics

SHAKES WHEN I ACCELERATE

2005 Ford F-150

Shakes or Wobbles problem
2005 Ford F-150 V8 Four Wheel Drive Automatic 130000 miles

truck has been great until last night. When I accelerated, it began to shake. Felt almost like a flat tire. When I let off gas pedal it does not do it. Could bad gas be the culprit or some other problem. I know it needs a tuneup as it hasn't had one yet. Thanks!
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Coachnorred
September 29, 2010.




See my profile,

I do not know specifics about your rig

I do know general things to check.

Vehicle off

Wheels chocked front and rear

BE CAREFUL!

Out of gear

Crawl under at driveshaft to differential location

Grab Driveshaft between Yoke and Transfer case with one hand

Grab yoke side of driveshaft closest to the differential with other hand.

" WRING" The " U" Joint like a wash rag---opposing force to the center portion, between the yokes (" +" looking part, look at the ends of the " +", the round ends, are called bearing caps or needle bearing caps---this is where the WEAR will show.

THERE SHOULD BE NO " SLOP" or " PLAY" in the assembly. Any movement with one hand should move the entire assembly Simutaniously. Even a Teeny-Tiny little bit of wear in the bearing caps is WRONG!

You have 2 " U" Joints on each Driveshaft----Check the other one, against the Transfer case. The same way.

I have had this same issue many times with my Jeep, and friends Jeeps (extreme driveshaft angle causes fast wear). Most recently, my Dad drove his 1976 F-150 " U" joints until they almost were falling out. It had a Horriffic shudder when under power!

Sometimes you can hear them squeaking/ squealing before they get terrible. On CJs usually its more noticable during Decelleration.

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The Medic
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