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are you a good enough mechanic to figure this out?
Posted 05 March 2004 - 04:41 PM
I have a chevy truck that has a fairly substantial vibration which only occurs from barely moving to about 15mph. It does not occur when coasting at those speeds, ie. downhill, instead it only occurs under power. It also goes away, or is not noticeable as soon as the truck is above 15 mph. I have taken it to a tranny shop where they changed the ATF and put in all new tranny mounts, no change. I also had the entire driveline rebuilt, all new joints and carrier bearing(it is a 2 piece driveline supported in the middle by a rubber mounted carrier bearing) still no change.
I have been able to see the driveline shaking, like it is out of alignment but I really don't think it is a balance problem because the vehicle is smooth at all other speeds. I have also checked to see if the tranny and transfer case are securely bolted down and that the output shaft is not wobbling at the junction of the transmission tail, as far as I can tell all is good.
Does any body have any ideas where to go next?
Posted 05 March 2004 - 06:20 PM
I had a rear going bad on a Dodge that shook the whole car at low speed. Slowly got worse for about 1,500 miles then started to bind up. Ended up I replace the entire rear end.
Posted 05 March 2004 - 07:18 PM
I kinda like the diff idea though.
Posted 05 March 2004 - 07:38 PM
If you want to test the Texan's idea use a hose clamp.
Posted 05 March 2004 - 07:58 PM
take bolth shafts out and have a driveline shop test them bolth
i saw a recent article on driveline vibrations thats how i know
Posted 05 March 2004 - 09:54 PM
Posted 06 March 2004 - 11:57 AM
Posted 07 March 2004 - 01:53 AM
Have you ever seperated it? It really has to be aligned correctly or will do just waht you describe.
Posted 07 March 2004 - 02:09 AM
Posted 08 March 2004 - 06:35 AM
I agree with "oddcomp" get it re-balanced and ensure it is married up properly, they normally have an alignment mark if not you should have center punch each part to make sure it went back together the same way.
Posted 09 March 2004 - 05:58 PM
Posted 09 March 2004 - 06:14 PM
I found a lot more mismatched two piece shafts in my years of mechanics though.
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