dat521gatherer Posted July 28, 2008 Report Share Posted July 28, 2008 i usually dont post with my problems cause it's too easy to search and find similar postings to fix it but my search ends here with this thread. this is going to drive me crazy. it already is or i wouldn't be asking. i've done a few things to my 71 521 over the last couple months that may be suspect to my vibration problem. put in another l16 and kept the same trans. let me tell you it only vibrates while stepping on the gas. i have no vibration in the steering wheel at all. there is a oscillating vibration til i get to about 40 mph then its a constant vibration. as soon as i step on the clutch and coast the vibration goes away. does a bad rod or crank bearing cause vibrating? will a loose pressure plate or flywheel cause vibrating. (recently replaced) changed rear trans seal with a thinner body? (grabbing at straws here) i have a new rear tire but i think it would vibrate with the engine engaged or not. i'll check with my known good spare to make sure. the first thing i thought it was is the drive shaft. crap this is going to be a longer post than i want. i know what a drive shaft wooble feels like and this feels more like a vibration. BUT after i swapped engines i noticed the engine sitting forward more slightly and had a clanking slap sound when i hit the gas at all speeds. come to find out i'm looking at the rear spline and i see fresh metal as the yolk (behind the carrier bearing) has moved forward about an 1/8 of an inch after the engine/trans being installed. so i lubed the yolk and the slapping noise went away. could that small lengthening of the drive really cause my vibration? i wish i had a 1/8 to 1/4 spacer to stick in the back of the drive line to check. then i thought carrier bearing but when i grab the drive line on my other truck it feels the same. i'd hate to start swapping out drive lines and carrier bearings but i suppose the process of elimination has to start somewhere.:mad: i also noticed my u-joints don't have zerk fittings. whats up with that? any advice, tricks, tips, sympathy would be appreciated.:) Quote Link to comment
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