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Could you post up some pics of your setup? If you have your 3rd pointed up towards the tcase output with regular old U-joints and not the double cardan joint then that might be the issue. Single U-joints are supposed to be installed with the output and input shafts parallel to each other, if that makes any sense to you...
I’ve been tackling this driveshaft vibration on a new setup for a few weeks now. And frankly it’s *&^%$# me off. I just got done installing a 1UZ + dual cases and adapters. This has shorten my drive line to I think 39 inches. On top of that, I have a 5” plus leaf spring lift. The drive shaft has a single cardan. It was freshly built with .120 tubing and stock OEM toyota U joints. U joints are greased up and were checked when it was made. Shaft is also balanced.I think it has something to do with phasing. As my third points directly up to the transfer case. This worked really well on my previous setup running double cardan shaft. This is what I have tried: 1. flipping the driveshaft around. 2. Taken off the driveshaft and inspect the 3rd flange and the TC flange. 3. Put jacks stands on, put the car in drive “without” the driveshaft. there are no vibrations. Therefore output bearing to flange nuts are good. 4. With jack stands on, reconnect the driveshaft and put in gear (D). I could hear the vibration coming from the driveshaft all the way to the 3rd member. I have driven it a few times around the block on pavement for testing purposes only. I have not driven it above 45MPH. So I need some advice on where I should take my runner to. I am very picky as I do all work myself and in my garage. I live in Fresno, Ca and I can tow the truck anywhere in this area. I am NOT cheap but I am also NOT a bank. I need someone who has knowledge about this subject and can quickly diagnose and resolve this problem. Thank you guys in advance.
I am NOT cheap but I am also NOT a bank. I need someone who has knowledge about this subject and can quickly diagnose and resolve this problem. Thank you guys in advance.
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