differential/ rear end torq tube

[kevinmac/toledo]

i was reading les andrews book...troubleshooting,ect. in it on page 2-44 it states; 3 different torq tube configurations were used on the model a two were straight within 1 1/2 ft fron u joint the third was tapered all the way...im familiar with the tapered one... are there records or charts to show what models , or years the changes were implimented ?.....what years apply to what taper on the torq tube ...never saw a discussion on this in the few years ive followed ford barn , and now own 2 model a fords.......thanks for any info, knowledge, input , even wives tales of what youve heard would be neat , and appreciated/////thanks ....kev