Topic: DRIVELINE VIBRATION

[ozyota]

Need some help in diagnosing a vibration in the rear of my '83 Hilux.
The vibration seems to be worst at 95 - 110 km/hr, at that speed it is rattling the gear levers for the transfer cases.
At first i thought it had to be the rear tailshaft as it had single uni joints, so had a cv / cardan joint fitted and balanced. Then rotated the rear diff pinion to be 2 degrees lower than the tailshaft slope.
This seemed okay for a while but the vibration has come back?
Does the pinion need to be down 2 degrees with a wrap bar?

It has a v6, auto with dual cases

Could the cv joint have gone bad or using an ifs cv not allowed for enough operating angle?
What is the optimal operating angle for these cv's?

Cheers
Matt

[Nimyad]

If its an ifs cv you probably want to clearance is. Could also be that your rear flange is loose. Or a u joint is going out. I have a really bad vibration and it was a u joint.

[ozyota [OP]]

There is some play in the rear transfer output, but from what i have read its normal?
Not sure what could cause the movement as all bearings are new.

[ozyota [OP]]

Okay clearanced the cv joint as it was at it's maximum operating angle.
Vibration is better but still there at high speed
When running a wrap/ track bar do you need to allow for the movement of the rear diff pinion,
Or does the wrap bar allow you to set the pinion straight at the transfer case?

[Cheesemaker]

If your wrap/track bar is mounted directly to the rear axle, it will help keep the pinion pointing to the t-case output. 
 
The ones that mount from the frame rail to the u-bolt plate, allow alot more wrap than they should. 

[Royota]

if it's just at high speed are you sure it actually IS your driveline? an unbalanced or flatspotted tire can do that to your axle which is obviously attatched to your driveline. blown shocks will make that bad too and mine are blown as s*** haha check your tread and also it might be your engine/tranny mounts. mine vibrates even at idle and I don't really care I paid $400 for the whole pile from a meth-head so whatever haha check it over. if everything works then... it's cool? check your bearings. how much play is coming out of the transfer case? there's a million places for vibration to come from and make other things look like they're busted.

[ozyota [OP]]

Okay i lowered the transfercase crossmember to line up directly to the diff pinion. Same angle, Test drove it and the vibration is still there.
Rotated the wheels to eliminate the tyres already. I do have some new 33" tyres i could swap thou.
Engine mounts are new. I will check the shocks, seem ok when you bounce them.
The transfercase has some movement so i guess i will strip the back off and check where the movement is coming from.
The movement seems to be the rear roller bearing, which i read is normal to have some movement?
Transfers where all rebuilt with new bearings when the dual cases went in. Is it possible that the rear bearing could be of poor quality or the clearances not as good?

[85runner_]

Remove rear drive line. Test drive

[ozyota [OP]]

Not sure if my square front driveshaft will do 100km/hr.
Have some other shafts that may fit, or i will have to make one up.