OdinsRedblock;d-11062 wroteOh and just out of interest, does anyone know when the bigger flanges were introduced and which models they were used on?
Smaller ones are known as the 1140. Bigger ones are known as the 1310.
Group 4, Page 110 of the 1966-72 140 Parts Manual doesn't really show the differences; they just list the part numbers.
However, in Group 4, Pages 64 to 75 of the 1973-74 140 Parts Manual, they describe the two types of tailshaft end flanges, and list the various applications and combinations. Picture pages 73 and 75 show the measurements of the 1140 and 1310 flanges.
To work out exactly which types were fitted to what pre-1973 model and which chassis numbers, you'd have to compare the part numbers listed in the 73-74 catalog, because that's where they define them as either 1140 type or 1310 type, instead of just part numbers.
As you can see in the catalogs, tailshafts with a 1140 flange up front and a 1310 flange at the diff end were factory, and common.
Very generally speaking, the B20E engine cars got 1310s all round, as did the 164Es; everything else got 1140 /1310 except some S-xxxx (special vehicles). (Funny thing with 1800Es though - the B20E 1800E and ES got 1310s all round, but the B20F cars got 1140 up front and 1310 at the diff. Something to be aware of, if you ever have a US market 1800).
Before you order uni joints or a centre support bearing, it's best to know if you need ones to suit a 1140 or 1310 flange. People get caught ordering the wrong ones for their need from FCP or whoever, because it's easy to do.