sled said:A U-joint is probably starting to go bad. if you have gears you may need the fms driveshaft.
#1pony said:I had 3:73's installed last summer. Should I get an aluminum drive shaft?
Yeah since a gear install has been added to the post I will strongly agree. What BADBOY mentioned above is correct but I have never had good luck with a stock driveshaft after doing gear installs for people.BADBOYSPACK said:2. Index the drive shaft 180 degrees, if the vibration changes then you know its the drive shaft. Then try moving it 90 degrees in either direction after the 180 degrees to try to fine tune it. In all honesty I will bet you lunch that its the drive shaft.
#1pony said:I had my drive shaft spun at a shop and they said it is fine but there is a vibration that comes on at about 85 mph. I know that it is not rpm dependent so what could be causing this? If it is part of the transmission how can I find out exactly?
#1pony said:I had my drive shaft spun at a shop and they said it is fine but there is a vibration that comes on at about 85 mph. I know that it is not rpm dependent so what could be causing this? If it is part of the transmission how can I find out exactly?
BADBOYSPACK said:You said the vibration was at 100 mph and now its at 85 mph. That tells me that when the driveshaft was indexed it changed the vibration speed.