leversole Posted November 16, 2012 Share Posted November 16, 2012 Got my wife and son to get some video of the operation...Looking at this tells me the frame is not flexing and the bounce is coming from the rears...now some more detective work...comments are welcome! Quote Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/ Share on other sites More sharing options...
1951 Mack LJ Posted November 16, 2012 Share Posted November 16, 2012 Reminds me of my old Chevy truck with Bias Ply tires. She bounces all over the road until the flat spots round out. Quote Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/#findComment-146310 Share on other sites More sharing options...
David Posted November 16, 2012 Share Posted November 16, 2012 Looks like more movement in the front rear than the rear rear. Can see it most in the bottom of the tire. Another video showing the bottom of the tires on both axles at the same time might help narrow in down. Also the other side. Quote Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/#findComment-146311 Share on other sites More sharing options...
fxfymn Posted November 16, 2012 Share Posted November 16, 2012 Have you checked for out of round tires or wheels yet? It would be pretty easy to set up a gauge to run against the tire while you spin it by hand. Have you run the truck with a load on it? I wonder if weight on the fifth wheel would change the dynamics? Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/#findComment-146340 Share on other sites More sharing options...
rsb502 Posted November 16, 2012 Share Posted November 16, 2012 Sure looks like a tire bounce, but it could be a bent axle shaft or two out near the hub I would do as advised above,jack the truck up ans spin the tires against a guage of some kind, you can just use a stick with a mark on it nothing fancy and see if the tire or wheel are wobbling from there check the hub of the offending wheel to determine the culprit. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/#findComment-146361 Share on other sites More sharing options...
Freightrain Posted November 16, 2012 Share Posted November 16, 2012 Id try to get some weight on it. Get some heat in the tires and see if they smooth out. Beg borrow or steal a trailer? Do you have air/electric to pull something?Jack it up and rotate each hub. Using a broom handle on a post to measure any run out at the hub. Then work on each tire. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/28376-bounce-revisited/#findComment-146362 Share on other sites More sharing options...
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