How does one install a Speedi Sleeve at the rear main "on crankshaft rear main seal area" as OP Skooter says at the top of this thread? Seems to me that it would be hard to get it by the flywheel flange at the rear of the crank. Picture below is from 1929-54 Chevy Master Parts Catalog.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.