Minor vibration/shake at rear

[Bloomer]

Hesitated even posting this, as maybe it's just road condition. But, have noticed this 2X and wondering if there is something to it.

Minor shake in the rear of the land cruiser at about 45 mph. I've had similar effects in other vehicles on the front end (albeit at higher speeds) due to bad steering stabilizer, alignment, u-joints, and tires out of balance.

Recent suspension install (2.5 inch OME with Slee heavies). Tires pretty new (BFG AT/KO) with about 3,000 miles on them. Have had them off a few times throughout the suspension install, so possibly lost a weight (but haven't noticed any laying around the driveway). Will try rebalancing, but wondering if there are any other possibilities. From searches, I've read threads on bent drive shafts and bad u-joints. For me, both of those fairly unlikely (only time off road was 100s in the Hills - where I was very easy on the Land Cruiser, and it has less than 50,000 miles so hopefully u-joints are still in good shape).

Any other suggestions on things to consider?

Appreciate the help.

 

[2001LC]

Most likely tire/wheel balance, I'd say 90% sure thing if you'd not just done suspension. So call Slee and ask if common issue after recent suspension install that was done.

That said; Newer tires wear though a lot of soft top rubber first 10K to 20K mile and need balancing more frequently. Also I've seen many tires with tread or side wall hop. When one of those tires ends up on rear which is lighter than front-end, it will often be more apparent. Also tires sitting overnight will get a little flat spot, that works-out once warmed-up. So warm up at highway speed then get on smooth surface at 45 mph to see if vibration repeats. Worth noting: shop have asked me before if I like balance more for high or low speed.

Try road force balance with a 5-150 finger adapter using proper cone hub for Toyota wheel. You'll have to call around to find shop that has road force balancing machine, not very common. While they spin tire have them closely watch tread and sidewall.

My LC was running smooth as silk last 5,000 miles. Then I went back for balance & rotate which was overdue. New tech did not know how to properly use tools I just outlined. I'm now getting more vibration from rear, than acceptable to me. But also wondering if I've got one bad tire (tread hop) on rear. I'll rotate again to see if different, before next re balance.

 

[2000UZJ]

I am betting 99% on tires. A driveshaft is going to give off a very fine vibration. Almost like a back massager. I recently bent mine and it would vibrate with no load on the drivetrain horribly at 45mph+. I could accelerate briskly with no vibrations up to 80MPH but once I let off the throttle it was horrible.

 

[marshotel]

Recent suspension install (2.5 inch OME with Slee heavies).

It could be the tire balance, but seems like there have been numerous reports of strange vibrations and shakes after recent suspension installs where people add stiffer springs and lift the vehicle, which messes with the driveline angles.

A couple questions:
1) How do you know the vibration is from the rear ?
2) Did you drop the differential when you added the 2.5" lift and heavy springs?
3) Have you tried an alignment and a tire balance?

 

[Bloomer]

It could be the tire balance, but seems like there have been numerous reports of strange vibrations and shakes after recent suspension installs where people add stiffer springs and lift the vehicle, which messes with the driveline angles.

A couple questions:
1) How do you know the vibration is from the rear ?
2) Did you drop the differential when you added the 2.5" lift and heavy springs?
3) Have you tried an alignment and a tire balance?

1). Basically, just feels like it. Guess it could be occurring in the front and feels like the rear. But, just calling it like it seems to be.
2). Diff drop installed in front. Minor adjustments to do this, but wouldn't say I dropped it. Of course, had to lower the rear axle to remove/install rear springs.
3). Alignment.....yes. Tire balance.....not yet, but planning on it when I have it in town.

 

[driveshafterw]

driveshafts

if you put asusointion lift the drive shafts are gona be shorter therefore they might be toshort take the drivelines out take greese fitting out of slip yolks compress all the way down (if you dont take grees fitting out you wont be able to compress) then pull the slip yolk out 1.5 in mesure from flange to flange mesure flange to flange on truck if differance is more than 1 in then your drivelines are to short another problem could be the slip yolk came off and wasent put back in exact place when ballenced there together they need to be in phase if the slipyolk the syolk is supost to bolt to the trshsfer cese tue ujoint from the transfer case side gets more wear to becuse you cant shim it like the rear if your in phoenix az then take it to my shop 9th av hatcherand ill give you a free check