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summitized 03-15-2009, 09:18 PM instaled a 4 inch rancho on my 06 gmc hd. have slight vibration at 60mph.thought it was tires......they check ok 35/12.5/17 procomps.i have 3.5 blocks on the rear with air bags.....would the vibration come from the drive shaft.........its driving my a little nuts varty yo 03-15-2009, 09:35 PM yup looks like you win need a dual cardon front shaft. i need one too. summitized 03-15-2009, 10:39 PM yup looks like you win need a dual cardon front shaft. i need one too. is your vib at around the same speed. does come and go?comes at around 100km goes slightly 110 km. varty yo 03-15-2009, 11:18 PM yuppers!!! mine comes at around 70km, but im at more of an angle with my bigger lift summitized 03-15-2009, 11:22 PM how long have you had this vib...wreck any thing summitized 03-15-2009, 11:28 PM is the dual cardon shaft easy to put on....or is it a new complete shaft. heymccall 03-15-2009, 11:43 PM instaled a 4 inch rancho on my 06 gmc hd. have slight vibration at 60mph.thought it was tires......they check ok 35/12.5/17 procomps.i have 3.5 blocks on the rear with air bags.....would the vibration come from the drive shaft.........its driving my a little nuts Are the rear blocks in the "right" way? Was a spacer installed to lower the center driveshaft bearing (assuming you have a 2piece drive shaft)? Aprilwine 03-16-2009, 12:15 AM yup looks like you win need a dual cardon front shaft. i need one too. Haven't you got yours done yet??? :grd: Aprilwine 03-16-2009, 12:18 AM is the dual cardon shaft easy to put on....or is it a new complete shaft. You can buy a complete new driveshaft or send yours out to a driveshaft shop and have them put the cardan joint in place of the U-joint at the TC end of the D-shaft. It's a simple removal and install. I did my install in about 15 minutes. varty yo 03-16-2009, 07:53 AM Haven't you got yours done yet??? :grd: ni i havent yet. i just dont use the 4wd at high speeds. when i get time here in a few weeks im gonna get on it. | ||