One of the best places for 833 information is here
http://www.brewersperformance.com/orderinfo.htm
They explain the numbers on all the pads.
The external looks are all the same the internals are not gear ratios and syncrs are different plus front bearing retainers
are not all the same. Main Bearings are different also from older to newer transmissions.
The tail shaft and housings as stated are different as are the shifter mount points.
Bryan
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71 RoadRunner Owned and operated from 1975

My first Car and Love, Ask my wife