ome lift now have vibration (didnt before)

[hward1]

have a vibration now at speeds roughly 25-45 not really noticed at high speed - checked ujoints all very tight no movement - i have driveshaft in phase --- (the only thing i did a while back was i took the driveshaft apart and didnt mark it i but it back inphase put i think by looking tonight it maybe some teeth off maybe -- the truck didnt have a vibration until the lift today after installation -- so any suggestions -- i guess i could try and take it back off and make sure its lined up correct anyway to tell for sure -- before i layed it on the pavement until it sit flat - i thought - also havent checked any pinion angle -- would having very small tires cause this because i havent changed the tires yet

 

[franklin40]

what shackles did you use? I used man-a-fre anti inversion and they are longer than OME so it changed my pinion angle so I needed shims. if you used OME shackles I think they are designed to keep your pinion angle stock. I may be wrong. take your rear drive shaft off and drive front wheel drive to see if you still have the vibration. that may isolate it to front vs back and also tell you if it's somewhere between the transfer case and rear end or if it's still there is somewhere in your axle. i am still playing a little with shims to get mine perfect but I'm not there quite yet.

 

[hward1]

ome shackles used ---

 

[klinetime574]

Which weight suspension did you get?

If heavy it may throw off the angle just enough. Medium suspension worked good for me.

How's the shackle angle? Shackles torqued correctly?

 

[bapmia]

have a vibration now at speeds roughly 25-45 not really noticed at high speed - checked ujoints all very tight no movement - i have driveshaft in phase --- (the only thing i did a while back was i took the driveshaft apart and didnt mark it i but it back inphase put i think by looking tonight it maybe some teeth off maybe -- the truck didnt have a vibration until the lift today after installation -- so any suggestions -- i guess i could try and take it back off and make sure its lined up correct anyway to tell for sure -- before i layed it on the pavement until it sit flat - i thought - also havent checked any pinion angle -- would having very small tires cause this because i havent changed the tires yet

The vibration is likely due to the change in the pinion angle. This change can be corrected with shims.

My truck had the same vibrations you described after my OME installation. I replaced my u-joints with OEM Toyota joints and installed two degree shims to correct the pinion angle (I highly recommend Roger Brown at 4crawler.com for quality steel shims built to your specs). The vibration has all but disappeared.

 

[hward1]

medium kit -- shackles torqued to spec -

 

[GeologistFelix]

Is it possible a worn CV joint doesn't like spinning at the steeper angle with the new suspension, but you couldn't feel it before with the stock suspension?

 

[Elbert]

I installed the heavy / heavy kit from Kurt.. I doubt its the pinion angle... due to such a minor lift.. Most likely drive shaft/u-joint or potentially you may have torqued things down before letting suspension settle. I have had no vibration issues with my setup.

I did install new u-joints when I did mine and I also made no adjustment in regard to spring shims ...did get an old school alignment.

 

[bapmia]

I installed the heavy / heavy kit from Kurt.. I doubt its the pinion angle... due to such a minor lift.. Most likely drive shaft/u-joint or potentially you may have torqued things down before letting suspension settle. I have had no vibration issues with my setup. I did install new u-joints when I did mine and I also made no adjustment in regard to spring shims ...did get an old school alignment.

Based on the idiosyncrasies of the OME set ups, no two are alike, regardless of whether they're alike! FWIW, I installed the light/medium kit from Kurt. My pinion angle was off exactly 2 degrees after the install. The truck had a wicked vibration in the same speed range noted by the OP. I replaced the u-joints first, but still had the vibration. After shims, there was 95% reduction in vibration. A simple measurement will tell the tale in this case.

 

[Elbert]

many things are possible.... could be

 

[hward1]

ill update when i figure it out -- wheres the best place to find the tool to measure the degrees - thanks

 

[bapmia]

ill update when i figure it out -- wheres the best place to find the tool to measure the degrees - thanks

Home Depot is where I got mine.

 

[TallCanDan]

ill update when i figure it out -- wheres the best place to find the tool to measure the degrees - thanks

It's called an Angle Finder, available at welding supply, Home Depot harbor freight...
Some will say to get a digital one, but IMO the regular ones work good.

 

[62LostInMn]

There's good info about this at;

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml#Measurements

You can really determine the angle by measuring the length difference from the TC output flange to the differential input flange. Top to top measurement versus bottom to bottom measurement. They explain it with diagrams at 4crawler pretty well and give you a rough measurement difference to angle conversion.

It worked will for me. Added 2 degree shims and the vibe is gone.

Good Luck!

 

[hward1]

ok -- got one from harbor freight $5 -- took the drive shaft off to see if i was off a tooth - wasnt sits flat -- going to check pinion angle next and will update soon i hope --

 

[hward1]

mistake ----

 

[hward1]

tc flange = 90 and dif flange = 88/89 -- so i guess that would mean diff. of 3 degrees - meaning i need a 3 degree shim -- would that be correct (and would i angle the differential down with the 2/3 degree shim)

 

[bapmia]

tc flange = 90 and dif flange = 93 -- so i guess that would mean diff. of 3 degrees - meaning i need a 3 degree shim -- would that be correct (and would i angle the differential down with the 3 degree shim)

Yes. That fat end of the shim will be toward the rear of the truck, causing the differential to point further downward.

 

[hward1]

ok thanks -- now to get some made from somewhere ill call 4crawler.com -- will i need longer pins and what shim ? bolt,centered, and also mine is a spring under

 

[hward1]

took a test drive with front wheel drive only - no vibration or not like it was - transfer case kept popping out of gear -- kind of worrys me - didnt do that with the rear driveshaft in -- would that be normal to happen - transfer case is rebuilt already