Lifted m1008 with a vibration under throttle

[84CUCV]

front is 4" tc springs. rear is the bottom of the shackle mount cut out. one of these shackles put in: http://diy4x.com/cart/index.php?route=product/product&path=24&product_id=113


Its the 5" one.. any ideas? maybe the pinon angle? thanks

 

[YZEATER]

when you did the flip, it pointed the rear pinion at the t-case. you'll need to re-adjust it. pics?

 

[rompinstompinmudmonkey]

Sounds like a pinion angle problem to me....

 

[Indy4x4Fab]

when you did the flip, it pointed the rear pinion at the t-case. you'll need to re-adjust it. pics?

I Know first hand that hes right. I had to reset my pinion angle in order to get rid of my vibration after putting in my shackle flip kit. Just go to lowes and get your self an angle finder, they are about 6 dollars, remove your drive shaft and place the angle finder on the yoke bolt holes at the t-case, then repeat prosses at the rear axle, subtract the two from each other and that will give you your degree or angle u will need to lower the axles pinion. Then ether oder them from diy4 or got to your local axle and spring shop and buy the shims you need.

 

[84CUCV]

ok thanks will get it done

 

[zombiyjay76]

Had to get a double cardan drive shaft for mine after I lifted it. No matter how I shimed the old one, never got rid of the vibes.

 

[k5floyd]

just thought id share my experience on my k5. i used 4" tc springs up front and ord shackle flip in the rear.

when i first installed the lift i had some vibrations on my rear drive line, so dropped the tcase an inch and that helped some. then i got shims, i believe 6 degrees, put them in and raised the transfer case back up. that got my slip yoke and pinion within a degree or two and my driveline vibration went away. but the combination of raising the tcase and pointing the pinion down some pulled the slip yoke out enough that it vibrates like hell on the tcase output shaft when i let off the throttle. this vibration is different than the driveline vibe in that its not felt nearly as much as you can hear it, its loud and a much higher frequency. im pretty sure just lengthening my drivelines will solve this.

 

[84CUCV]

thanks for the help.. going to work on in it in the am

 

[84CUCV]

did what indy4x4fab said. got less vibration. still there. tried a bunch of shims.. ideas? thanks

 

[YZEATER]

pics? let's see the angle. the rear pinion should be 1 degree less then the t-case yoke.

did you check the u-joints? one or both could be wore, and now that your running them at a different angle it's showing itself.

 

[84CUCV]

ok ill get some pics.. will check u joints..

 

[84CUCV]

yup need u joints there on the way

 

[84CUCV]

new u joints in.. 6 degree shim still a bit of vibrations...

 

[YZEATER]

with the long wheelbase, a 6 degree shim seems like too much. do you have a slip driveshaft or a slip yoke on the t-case? either of those could be worn.


read thru this thread- http://coloradok5.com/forums/showthread.php?t=280059&highlight=PINION+ANGLE

 

[84CUCV]

i helped with the u joints not the shims.. ok thanks ill take a look

 

[84CUCV]

put in 4 degree shims. we had already so we thought we would try it. still there.. could it be the shackle is to long? stock one is 4" about this is 5". went for 5" so it would sit level..

 

[YZEATER]

could be, but you should be able to get the angle correct with shims.

i hate to say it, but you could try dropping the t-case down and lessening the angle.

did you check the slip yokes?

 

[84CUCV]

yes slip yoke seems fine.. truck has very low miles.all still good and tight ordered 2 degree shims

 

[84CUCV]

all good now.. stock shackle back in 2 degree shims just did 65 on the high way no problems..

 

[YZEATER]

that's good, odd though.