Why does your car vibrate after giving it a lift

[NissanGQ4.2]

https://www.youtube.com/watch?v=gmV4qwLfOMY


https://www.youtube.com/watch?v=R3gKCv2dwcI

[MudRunnerTD]

Thanks Toddie.

Everyone should watch this video and think about your tail shaft and uni joints. This is Very. Very Important! Check this out and have a look at yours.

[mudnut]

Very good Info, thanks Toddie.

[megatexture]

would double cardan joints eliminate the vibrations though ?

[MudRunnerTD]

would double cardan joints eliminate the vibrations though ?

That's one of the reasons why guys with Shorties and big lifts have to fit a double cardan joint.

[Parksy]

Excellent video. Don't have this issue with CV's.

[megatexture]

That's one of the reasons why guys with Shorties and big lifts have to fit a double cardan joint.

I thought it was because having two joints makes it stronger due to less angle not the vibrations

[MudRunnerTD]

I thought it was because having two joints makes it stronger due to less angle not the vibrations

Certainly. Reducing the operating angle using the double Cardan relieves the drive train allot but is also reduces the vibration they get through it.

I'm not sure that a better video could be produced to explain it. I was not aware of the oscillating nature of the I is when they are out of sinc. I did have a bit if vibration through the. GQ and adjusted the upper trailing arms to increase the pinion angle to match the gear box end and it made a huge difference. I am going to check whether the unis are lined up and sort that out too.

[timmay556]

On this subject how does one check that their tail shaft is in "phase"

[MudRunnerTD]

On this subject how does one check that their tail shaft is in "phase"

Match the uni joints at both ends. Sit the both either vertical or horizontal at the same time when fitting the tail shaft.

[timmay556]

Match the uni joints at both ends. Sit the both either vertical or horizontal at the same time when fitting the tail shaft.

Thanks mud. I'm pretty sure mine is out. How do I re align? Do I have to pull out the shaft from the little end from the big one and then reinsert?

[MudRunnerTD]

Thanks mud. I'm pretty sure mine is out. How do I re align? Do I have to pull out the shaft from the little end from the big one and then reinsert?

Just take the 4 bolts out at the joint between the Unit and the Pinon and rotate to alignment and refit the bolts. 10 minutes max and no need to dismantle anything.

[AB]

Added extra video Toddy...

[timmay556]

Just take the 4 bolts out at the joint between the Unit and the Pinon and rotate to alignment and refit the bolts. 10 minutes max and no need to dismantle anything.

Surely that won't work. As the two ends of the tail shaft have a splined joint you can't rotate.. Otherwise the tail shaft wouldn't work.

[Nightjar]

Totally agree timmay.

[rusty_nail]

Surely that won't work. As the two ends of the tail shaft have a splined joint you can't rotate.. Otherwise the tail shaft wouldn't work.

yeah come one MR! get your story straight mate!!!

nah think about it guys, it totally makes sense. you should still be able to rotate the tail shaft from the other end?? with the gearbox in neutral etc?

[Nightjar]

The only way to align the universals so the spigots are identical position either end is to rotate shaft on the splines. You may have to have your tail shaft rebalanced.

[Extrimal D]

And if you try to put the CV joints?

[Convert]

Ive been getting a real clunk in the drive train recently and got under the y60 shorty today for a look.
the Diff backlash was clunky and so was the transfer gears but what surprised me was the sound in the drive shaft spline.
I greased the spline via the nipple and the clunk is gone now.
Just goes to show that even if the rear diff has wear in the spiders, that spine can be the actual problem.
Id say the drive shaft spline is probably worn out though.
Purchased a good second hand front diff head for it today as there was a tad too many big bits on the magnet last oil change and will do the rear as well as the drive shaft.
Good thing about these trucks is that the parts dont break the bank

[mudnut]

Do not click on the previous posts link!! Pricks are getting clever.

[MudRunnerTD]

Do not click on the previous posts link!! Pricks are getting clever.

Cheers Craig i was just sorting that out. Just report them mate. All good.