About 15 years ago I installed a TH400 in a 56J, and used a one-piece driveshaft, I believe 3" OD. I, "massaged" the original 2-piece carrier bearing hole, and rear tunnel for clearance in the areas mentioned above. Also installed HD rear springs from SASCO and HD front springs (526125) built to OEM spec by Coil Spring Specialties (which I woulda done anyway). I drove the car over 40,000 miles before selling it, and the driveshaft would very seldom kiss the floorboard, usually with 2-3 people in the back seat and hitting a large dip. So it really was a non-issue.
That 56J was one of two I have driven that did not have a droning noise, most prominent at 70-80 MPH. It seems to originate at the carrier bearing, then reverberate off the cardboard headliner. The only other 56Js I ever drove that did not have the drone had cloth headliner, instead of OEM cardboard. So I believe if the PO's Sky Hawk has a cardboard headliner, he may experience a noise reduction he did not even know existed. OTOH, maybe it's just a 56J thing. All I know is, I have driven maybe eight to ten 56Js (owned or repaired/test drove) and all but the above three had the drone. Never drove a Sky Hawk.
That 56J was one of two I have driven that did not have a droning noise, most prominent at 70-80 MPH. It seems to originate at the carrier bearing, then reverberate off the cardboard headliner. The only other 56Js I ever drove that did not have the drone had cloth headliner, instead of OEM cardboard. So I believe if the PO's Sky Hawk has a cardboard headliner, he may experience a noise reduction he did not even know existed. OTOH, maybe it's just a 56J thing. All I know is, I have driven maybe eight to ten 56Js (owned or repaired/test drove) and all but the above three had the drone. Never drove a Sky Hawk.
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