Airratchet
New Member
Hi all, Posting is new to me so please bear with me. I have a 70 Bronco with a 2-inch suspension lift from Wild Horses…springs, bushings etc. I have a low frequency body shake starting around 52mph, peaks at 58mph and starts to taper off around 62 mph (accelerating and decelerating). I have not been able to isolate it between the front or rear of the vehicle. There is a very noticeable movement between the dash and roll bar during the peak. I have done the following without a significant change (parts were swapped out one piece at a time): swapped front axle assembly, swapped rear axle assembly, replaced the track bar with a BC Bronco’s heim joint unit (it re-centered the front end very nicely), rear spring packs (with stock units), front coils (with stock units), C bushings (tried 2 & 4 degree), balanced the rear drive shaft, replaced all suspension bushings. I have owned this Bronco for six years. I did most of the work on it the first few months I owned it. Unfortunately I did not drive it long enough before modifying it to know if this was an existing problem but if it was there it must have been much milder. I do have one small note about the original setup. The original Dana 30 was extremely toe’ed in (but drove fine). We found this out when my friend used this axle, without adjusting the toe'in, and experienced the Bronco 'death wobble'. I am beginning to wonder if this was a clue pointing toward a warped frame? I am considering a new frame next if I don’t come up with a solution to the problem, though I would be very disappointed if the problem was still there after replacing the frame. Is there a legitimate way to have the frame checked? Are there any other parts options I have missed? Any suggestions are appreciated…thanks for the help!