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!
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.