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Discussion Starter #1
1990 Toyota pickup, 208,000 miles, all stock

I have recently started to get a vibration coming from the rear of the truck beginning around 60 mph. I put tires on about 1,500 miles back and installed bb’s to balance them, so I thought it might be a balance or rear tire problem. There is no vibration in the front or the steering wheel, so I switched the tires but ended up with the same problem— vibration in the back and perfect in the front. Any idea what I should be looking for?
 

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U joint? Seat of your pants probably rear, transmission gear shift, probably front. If it has a center bearing, that could also be a contributor. This assumes your wheel and tire exchange diagnostic was spot on.
 

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Thanks. I am going to jack it up tonight and take a look at everything, especially the u-joints. If they are loose that's obvious, but is there anything else with them that I should look for? Seems that I had u-joint issues with my 280Z and it was most noticeable when engaging first gear, but that isn't happening with my Toyota. U-joints at 208,000 miles seems reasonable.
 

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I have already rotated the tires and it made no difference. But you are right about tires and these are inexpensive tires and that is the first thing I though of, but apparently it isn't the problem.
 

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U-joints can also be tight. You have to remove the drive shaft to check that.
That's what I am going to try and look at tonight. Not sure if I want to do it myself, although the videos I have seen make it look straight forward.
 

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Discussion Starter #8
The u-joint do not seem to have any play in them. However, I have the two piece driveshaft and there is a lot of play in the mid bearing. Everything looks ok, nothing torn or broken, it’s just that I can easily one the shaft up and down. Would that cause the vibration?
 

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1998 T100 SR5 2WD
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Check yer transmission mounts fer wear. My 1998 T-100 auto were completely toast and wasn't doing their job. With the mounts bad, it can really work yer center bearing and U-joints over. ;)
 

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The u-joint do not seem to have any play in them. However, I have the two piece driveshaft and there is a lot of play in the mid bearing. Everything looks ok, nothing torn or broken, it’s just that I can easily one the shaft up and down. Would that cause the vibration?
Yes. the carrier bearing can cause vibration. It is replaceable.
 

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Discussion Starter #11
I just replaced the u-joints and center bearing. The bearing was sloppy and the u-joints were stiff so they needed to be replaced. However, that did not solve the problem. So I removed the bb’s from the rear tires and had them balanced and that took care of the vibration. These are the same tires that worked perfectly on the front, so apparently the lighter weight and/or rear suspension doesn’t work with bb’s. First time I have ever had a problem with bb’s. I had 3 ounces of bb’s in each tire and one tire took 2 3/4 oz and the other took 2 1/4 oz weight. Think I may just spring for an old fashion tire balancer.
 
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