My recollection is that there are two different pinion shaft diameters
The ’55-’58 Parts Manual shows the parts numbers below for the front oil (pinion shaft) seals. The pinion shafts get progressively larger and the tightening torque on the flange nut is 240 ft-lbf for the 8.25” gear set vs 250 ft-lbf for the 8 ¾” & 9 5/8” gear sets. It might be helpful to the parts-person to indicate the seal for your 300 is also the same one for a NY, Imperial or a wagon.
663602: ’55-56 Windsor, except Estate Wagon or ’56 with Power Package (4-bbl?) 8 ¼” ring gear
1404504: ’55-’56 Windsor wagon, NY, C-300 & Imperial, ’56 Windsor with Power Package (4-bbl?) 8 ¾” ring gear
587541: ’55 Crown Imperial (with 9 5/8” ring gear). Who knew? Truck diff?
Axle seals are the same across the board for Chrysler sedans with different seals for wagons and Imperials. Thicker axles?
Application data is complete for ’55-56 but some is missing for ’57-58 in this October ’57 manual update.
Something that has helped me in the past is being able to provide the original Chrysler part number. Advance Auto, NAPA, etc has been able to plug in that number and cross reference it to currently available parts.
Posted by: "Rich Barber" <c300@xxxxxxx>
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