1989 325i s52 swapped with g260 trans, JBR 11lb flywheel, 3.23 LSD
While driving home about 3 miles from home I accelerated from a turn and felt a shuddering/bumping as if I was driving over a bunch of tiny bumps. It was weird, so after next light, I accelerated hard again and felt the same thing happen. It can be felt through the seat and through the shifter. It almost sounded like the driveshaft was banging around. I drove home carefully and paid close attention. I could ever so slightly feel this as I drove in other gears, but not even close to how bad it is under hard acceleration and torque. I could only recreate the problem in 1st and 2nd.
I was planning to do a bunch of work on it anyway, so I started taking stuff apart to see if I could notice anything obvious.
-took cover off diff and drained fluid; it looked normal
-removed 2nd half of driveshaft to inspect U joint; it looked normal
-the CSB is new, but looked normal
-half shafts looked normal (I also just replaced one and rebuilt the other)
-wheel bearings seemed fine as far as I could tell? (no play when shaking the tire on an angle)
-guibo looks fine (probably could be replaced, but didn't seem to be an issue)
Also, all suspension bushings are new, coilovers are new, tires are new, brakes are new, and the engine was just entirely rebuilt (by me :) )
So needless to say, I am totally stumped on this one.
While driving home about 3 miles from home I accelerated from a turn and felt a shuddering/bumping as if I was driving over a bunch of tiny bumps. It was weird, so after next light, I accelerated hard again and felt the same thing happen. It can be felt through the seat and through the shifter. It almost sounded like the driveshaft was banging around. I drove home carefully and paid close attention. I could ever so slightly feel this as I drove in other gears, but not even close to how bad it is under hard acceleration and torque. I could only recreate the problem in 1st and 2nd.
I was planning to do a bunch of work on it anyway, so I started taking stuff apart to see if I could notice anything obvious.
-took cover off diff and drained fluid; it looked normal
-removed 2nd half of driveshaft to inspect U joint; it looked normal
-the CSB is new, but looked normal
-half shafts looked normal (I also just replaced one and rebuilt the other)
-wheel bearings seemed fine as far as I could tell? (no play when shaking the tire on an angle)
-guibo looks fine (probably could be replaced, but didn't seem to be an issue)
Also, all suspension bushings are new, coilovers are new, tires are new, brakes are new, and the engine was just entirely rebuilt (by me :) )
So needless to say, I am totally stumped on this one.
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