So yesterday I went 4wheeling I noticed a potential problem and figured i'd get sum input. When I would engage the truck into hi4 or low4, the entire truck would shake VERY NOTICEABLY. It would get worse the faster I'd go. Then when i'd get off the gas the entire front end would shake until the truck came to a halt. But with the front hubs not locked, none of this would happen. ONLY WHEN THE FRONT HUBS ARE LOCKED does this happen. I can put the truck in 4hi or 4low (for the gearing) and nothing abnormal will happen. I ran it shaking like this the whole day like this and it really killed part of the fun.
My best explanation on to how the shaking is speed dependent (not made to scale lol)
ACCELERATION:
MPH: ......0..........10..........20..........30
SHAKING: x x x xxxxxXXXXXXXXXetc...
DEACCELERATION:
MPH: .....30..........20..........10..........0
SHAKING: XXXXXXXXXxxxxx x ...x .....x
Sorry about the crude table but you get the picture... SO any1 have any idea wtf is wrong with my front end. Oh keep in mind that this is an sas 86 toyota, stock gears and open diffs front and back.