thysvdm Posted June 5, 2016 Report Share Posted June 5, 2016 good dayI have a 73 Datsun 1200 pickup with a heavy vibration. the vibration is only when I gear to 4th gear and when I'm at speed and i put the car to neutral its even worse. I've fitted a new prop shaft, done the t-housing bush,put a new clutch, replaced all the mountings, put new , new inner and outer tie rod ends, everything has been replaced but the vibration is still there. I've spend thousands on the car but the vibration is always there.I've even tried to re angle the shaft but that also did not work.is there any thing else that can cause this heavy vibration???I don't know what else it could be.I'm not to sure if my Datsun is a 520, 521,320 or so!!Does some one know what else can be wrong?? 1 Quote Link to comment
datzenmike Posted June 5, 2016 Report Share Posted June 5, 2016 Tire / rim balance. Mud on rim. Brake drum (broken ?) The '73 should be a 620 truck. Engine tag on left side inner fender should say PL620 somewhere on it? You should have a two piece drive shaft. At the rear of the front shaft is a carrier or center bearing support with a rubber isolator around it. These tend to rot away and the driveshaft is unsupported and will vibrate. Should look like this... This one is gone away. The driveshaft will just flop around. 2 Quote Link to comment
Dolomite Posted June 5, 2016 Report Share Posted June 5, 2016 Jordie town, UK...Is there a chance its a Sunny truck he's talking about? 1 Quote Link to comment
thysvdm Posted June 5, 2016 Author Report Share Posted June 5, 2016 I think it's a 73. The guy I bought it from said its a 78, but I don't think that's right. It has a single shaft. 1 Quote Link to comment
flatcat19 Posted June 5, 2016 Report Share Posted June 5, 2016 Does it happen at a specific speed? Wheels out of balance will start to be felt around 35-40mph. 1 Quote Link to comment
banzai510(hainz) Posted June 5, 2016 Report Share Posted June 5, 2016 is this truck lowered a lot. then the carrier bearing has to be raised up. This happens a lot on 5 speeds installed and over 3 inch drop 1 Quote Link to comment
flatcat19 Posted June 5, 2016 Report Share Posted June 5, 2016 is this truck lowered a lot. then the carrier bearing has to be raised up. This happens a lot on 5 speeds installed and over 3 inch drop One piece drive line. 1 Quote Link to comment
banzai510(hainz) Posted June 5, 2016 Report Share Posted June 5, 2016 put on jack stands and in gear!!!!!!!!!!!! 1 Quote Link to comment
datzenmike Posted June 5, 2016 Report Share Posted June 5, 2016 Lift and spin the tires. Are they round??? Don't laugh, had this once. Quote Link to comment
Eomund Posted June 5, 2016 Report Share Posted June 5, 2016 As you said you changed the shaft, they can be out of balance, and usually are weighted by the factory. Is it possible the driveshaft is out of balance? Alternatively, what's the condition of your U-joints? 1 Quote Link to comment
bilzbobaggins Posted June 5, 2016 Report Share Posted June 5, 2016 Rear end loose? Loose u bolts? Where does the vibration originate from? Quote Link to comment
thysvdm Posted June 9, 2016 Author Report Share Posted June 9, 2016 Hi all. Thanx for all the replies. I have tried everything possible. Today I balanced my wheels my self and found that the left rear mag rim is buckled. I've been in the Tyre game a while and never have i seen a rim that is buckled to cause a prop shaft to vibrate that much. the vibration only happens in 4th gear from 70km p/h and faster and when im at that speed and I put the car in neutral it still shakes and makes that vibration noise. I will replace the rim tomorrow and see what happens. I just hope that is the cause of it all cause there is nothing else that I can replace or fix that can still cause this vibration??? 1 Quote Link to comment
Eomund Posted June 19, 2016 Report Share Posted June 19, 2016 That sounds a lot like U-Joints to me. That center bearing bushing that Mike pointed out can cause this as well. 1 Quote Link to comment
datzenmike Posted June 20, 2016 Report Share Posted June 20, 2016 Swap it to the front. Vibration will move. 1 Quote Link to comment
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