rear vibration
Took the 86 out on the highway and noticed a vibration in the rear starting around 40 mph and up. Let off the gas and it stayed for a couple seconds and then went away with foot off the gas. Checked the ujoints and they are fine. I just put this rear end in last fall but it is used and I have no idea who owned it before me. Only thing I did besides gaskets was axle seals and axle shaft bearings. Yoke is tight.
86 GT vert
Projects: 1994 roller named Shirley
Any clean spots on drive shaft where a weight got knocked off? Rears don't usually cause vibration and when they start to go they make noise at any speed. Only other thing I can think of is a bent axle but that would make vibration at any speed.
Is the vibration dampener still on the rear, and tight?
1983 Mustang G.T. No-option stripper- I like strippers.
5.0, GT40P heads, Comp Cams XE270HR-12 on 1.6 rockers, TFI spring kit, Weiand 174 blower, Holley 750 mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, 8.8 rear, 3.73 gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.
Might sound foolish, but have you checked the balance on the tires?
Had a similar experiance several years ago on a co workers 89 Mustang GT. It turned out that the 4 bolts attatching the driveshaft to the pinion yoke had become loose, and the rear U Joint flange was wobbling around.
1978 Fairmont 2 door sedan, 428CJ 4speed. 9.972ET@132.54mph. 1.29 60 foot
Replaced the FE big block with my 331/4 speed in my Fairmont, best 10.24ET @128 MPH.
1985 Mustang LX hatchback NHRA Stock Eliminator 302 4 speed best in legal trim 12.31@107 mph, but has gone 11.42@115 with aftermarket intake, carb, and iron Windsor Jr. heads.New for 2012! 331 cube SB Ford, AFR 185 heads, solid flat tappet cam, pump gas; 10.296ET@128.71 mph, 1.37 60 foot.
1979 Zephyr Z7, all original 302 auto, 2nd owner.
Has the car been lowered? If so, your pinion angle is off, that would cause what you are describing. Also, worn axles/axle bearings wouldcause the same.
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