my burb is doing some serious vibrating on the highway around 70 mph. the vibe is cyclical going from road noise to near bone shaking every 1.5-2 seconds at that speed. i haven't noticed it at lower speeds, other than what i attribute to regular road vibe from off road tires. i wonder if this may be related to the excessive play in the driveline, or if i have two problems to solve. the truck makes that good old heavy "clunk" when i shift from reverse to drive, or any other time the driveline changes in the direction it is loaded, like going from heavy throttle to no throttle in a low gear. seeing as how this old beast is to be my daily driver, and i hit the highway to commute to work, i need to get this problem corrected. the basic info is this:
1975 chevy k20 burb big 400 with 350th, np203, manuals on the 44 and a 14 bolt in the rear. should be 4.10 lsd's, but i haven't yet chiseled through the crap to find the casting numbers. shes got wagon wheels and 31x10 cheap mud tires. 68k original on the whole thing. sat at grand lake in ok for about 10 years and was only used about 4 times per year to move a 28' sail boat. ive had it a few weeks and have put new brakes on up front, thats all.
any suggestions are appreciated
thanks
robert
1975 chevy k20 burb big 400 with 350th, np203, manuals on the 44 and a 14 bolt in the rear. should be 4.10 lsd's, but i haven't yet chiseled through the crap to find the casting numbers. shes got wagon wheels and 31x10 cheap mud tires. 68k original on the whole thing. sat at grand lake in ok for about 10 years and was only used about 4 times per year to move a 28' sail boat. ive had it a few weeks and have put new brakes on up front, thats all.
any suggestions are appreciated
thanks
robert