265k miles and counting..
Joined: Jan 2003
Location: Tampa Bay Area
I agree that it is probably a U-Joint. To check it, put the rear axle up on 2 jackstands and put the truck in gear(Or park). Now grasp the shaft with your hands and try to rotate it. This tests the front joint.If it is bad, it will likely exibit play or notchiness. Now put it in neutral and put on the parking brake to repeat the procedure for the rear joint.Try hard to move it in any possible direction, if it can be, then it is bad. Other things it can be: bad trans mount, bad engine mount or a bad hanger mount.
BTW, I have 205,000 on my 98 Frontier 5 spd, 4cyl King Cab and have had no issues with my driveline as of yet.However, your truck is built on a different frame than mine as all V6's are built on the 4x4 frame,IIRC.
1998 Nissan Frontier XE/2wd/5spd 1 owner, 264k miles
1985 Olds Cutlass, 350 Chevy, owned for 14 years
WANTED: 1968-1973 Datsun 510 or 1991-1994 Sentra SE-R
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