Not supposed to! It is sorta like newer constant velocity transmissions. If you are not familiar with the Dynaflow, do not be disappointed that it does not "shift" in drive. The SHOP MANUAL for 1950 is very inclusive and readily available as a repro. I agree with Rusty, and others, get it running and see what happens. The 50 series has the new for 1950 263 CI engine. The smaller series Special is a 40 series. If I understand you, this is a Super, 50 series, and as such is the middle size Buick. If not centered you will have a transmission that will jump out of third gear on deceleration, poor clutch operation and possible excessive wear on transmission internals. On drilling the rear of the crankshaft, if and that is a BIG if you can drill it straight, great.
#1950 BUICK DYNAFLOW MANUALS#
At least on the Dynaflow the difference between the pilot holes was about 1" IIRC.Įngineering wise I cannot tell you the reasoning for the larger Dynaflow pilot as I cannot offhand remember any other engine the used different diameters but as the amount of Dynaflow cars soon outnumbered manual transmission Buicks (3% of all Buicks in 1955 were manuals IIRC) it made more economic sense to service one crankshaft and add a sleeve for use of the pilot bearing. The Dynaflow has a larger diameter center pilot on the front of the torque converter that centers into the crankshaft.Īt least on the Nailhead V8's the service crankshafts were all machined for the larger pilot hole of the Dynaflow, There was a spacer ring that pressed into the crankshaft which reduced the size of the hole to accept the earlier mentioned pilot bearing. On a manual transmission a ball bearing is used to center the input shaft of the transmission to the crankshaft, pressed into the hole machined into the rear flange. The rear of the crankshaft has a pilot hole in the back that faces the transmission.