Have a 87 sport, it was purchased new in 87 by the usaf and used until 97 when Fort Gaines Police Dept got it and kept it till I got it. Truck runs like a champ but vibrates bad at high speed. It started at 45 so I had tires rotated and balanced and guy said they all balanced great. Changed trans mount with new not china made and both u joints. Had to use 4 wd u joints for some reason. Replaced idler arm bushing also. All steering and suspension seems solid but I know looks can be deceiving but seems to have no play. I did notice my torsion bar bushing I believe it's called are cracked up bad. Trans still clunks in gear too but not all the time and when driveshaft was taken out fluid was light brownish color no red tint. Any suggestions what to look at next. I'm wondering if my steel wheels are centering correctly or maybe unknown bushings wore out. Should I just shoot to rebuild the entire frontend. How can I tell if my output shaft in trans is warped. I'm just at a loss as to the cause of this vibration but will not give up or in until solution is found as I have to drive to work and need to do 70 not 45 on interstate. Lol
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