Driveshaft vibration with lift? - Page 2 - Toyota 4Runner Forum

Toyojay · 03-05-2019, 08:20 PM

Much cheaper than a custom drive shaft lol.

Like said above keep the joints and slip yokes greased and they'll last a very long time. Per Toyota, it calls for lithium based (usually red) grease for the 4 joints and moly based (usually black) grease for all the slip joints. This will also take care of the clunk when accelerating if your's is doing that after the lift. Mine had it pretty bad after 110k of P.O never greasing the driveline.

Formidable · 03-13-2019, 09:52 AM

Also V8 AWD. Toytec 3” lift is on. Whaddaya know... vibration at highway speed. Wheels and tires just balanced. Had the U joints greased by installer. Any other ideas?

Formidable · 03-13-2019, 02:15 PM

Apparently the rear slip yoke can be overgreased. When overgreased it impedes compression of the yoke which results in vibration at highway speed. Simple solution is to remove the 7mm zerks fitting on the rear slip yoke. Back up over a curb and compress all the excess grease out. Tighten zerks down.

Will have my install shop try this out and report back.

WhiteBoomer04 · 03-13-2019, 03:24 PM

Spent the last couple years trying to work out why I had this type of vibration. Wheel bearings, driveshaft, CV's, transfer case, adjustable panhard, lower links, balljoints...blah blah..

So this week I'm finally underway with SAS'ing my truck and my builder says that my rear axle is bent somewhere. Pulling all that schit out anyways but how frustrating.

Formidable · 03-13-2019, 03:55 PM

This has been a major issue with members removing and reinstalling their entire suspensions to try and trouble shoot. Apparently it’s as simple as over greasing the rear slip yoke

Quote:

Originally Posted by WhiteBoomer04

Spent the last couple years trying to work out why I had this type of vibration. Wheel bearings, driveshaft, CV's, transfer case, adjustable panhard, lower links, balljoints...blah blah..

So this week I'm finally underway with SAS'ing my truck and my builder says that my rear axle is bent somewhere. Pulling all that schit out anyways but how frustrating.

Ida4runner · 03-13-2019, 04:31 PM

Are you sure it's not your CV axles vibrating? 3.5"+ is a lot of lift.

Formidable · 03-13-2019, 06:01 PM

So... Instead of undoing the zerks fitting on the rear slip yoke I figured I would give this a shot. Theoretically, if overgreased the slip yoke won’t compress. I figured realistically just how much can this impede drive shaft compression? And what if you were to gently force it to compress?

Found a 5 inch curb. Pulled the truck perpendicular to it. Put the truck into reverse, gave it a little throttle, (hit the curb at 2mph), and went up and down this curb five times.

Vibration at highway speed is now gone. Could it really be this simple? LMAO

Formidable · 03-14-2019, 10:27 AM

Someone with this problem try this and confirm. It is a major issue for several on this forum with potentially an extremely easy fix.

I can’t reproduce the vibration at any speed. It’s completely gone.

BackOff · 03-14-2019, 02:52 PM

Yeah it seems like there are a bunch of threads about over doing it with the slip joint.

I remember reading about one guy said he pulled the zerk out after greasing.
Also i think one guy either drilled the zerk or popped out the middle/guts of the zerk fitting.

I use a larger grease gun and one pump into the u-joints i have grease coming out. I wipe off the extra and do it again next oil change. One pump to the slips too...never have i seen any grease ouzing out of the slips.

I am just some internet parot though. Probably should not listen to anything i say.

I get that brake letoff 'clunk' if i dont grease the rear drive line slip joint.

JOMOToyota · 05-29-2020, 05:15 PM

Having this issue when accelerating after a 3" lift. Goes away when I let off the throttle. Definitely a heavy drive line vibration. Has anyone experienced this is reverse order of the OP?

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