I have a '86 Toyota 4Runner, and the front driver side wheel just recently started vibrating at low speeds. I'm farely sure the wheels and tires are properly balanced, as I recently had 2 tie rod ends and an idler arm replaced, along with an alignment. Please help.
Make sure the balance weights are still there, they can fall off from time to time. If its not that, jack it up and spin the wheel to see if you have a "flat" spot on the tire. Next grab the tire on the top and bottom and shake it, if there is play in it then the wheel bearing in bad or the ball joints need replacing.
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front drive shaft is the most likely as it does little work and the grease tends to dry out promoting wear
check all slip joints on both drive shafts as well as "u" joints
check engine mounts and front diff mounts as if they are broken , that will allow misalignment of the shaft angles
This could be anywhere in the drive-line. Process of elimination would be the best approach. From your symptoms it sounds like the bad vibration is noticed at low speeds. There are many moving parts within this system. Were there and recent repairs performed? New tires could cause a vibration, if the tread is aggressive. Damaged wheel-bearings, defective components inside the rear differential (suspect low fluid level, damaged ring and pinion or bearings), defective U-joints, or internal transmission failure. You didn't mention if the truck was 2wd or 4wd. If the vehicle is a 4X4 then you will need to inspect the transfer case, the U-joints in the output shaft, and the front wheel bearings. I'm not sure how far you want to go with the diagnostics. Please write back if you have other questions or to give an update to how the repair is going, good luck.
You have a tire that is out of round. Jack up the tires about 1/2 inch off the ground place a pencil at the edge of the tire and while turning the tire look at the bottom of the tire and between the ground watch to see if tire goes up and down or wobbles side to side as you turn the tire. If tire is out of round it will cuase this problem. Also check you beargins on the fron wheels to see if they are loose. to do this grasp the tire at top and bottom and try wiggling the tire back and forth, if there is movement the bearings are loose or you have a bad tie rod end. However the most common overlooked problem for this car is The passenger control arm. If you need more help post here and Will give you some more do it yourself tests. This will narrow it down and save you some money.