Re: Mystery rear end

[twfaust@xxxxxxx]

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The 8-3/4" axle was available in three basic types.? The types are differ- 
entiated by the pinion stem diameter....1-3/8", 1-3/4", 1-7/8".? The choice 
of axle pinion assembly was determined based on the application. 

1-3/8" small stem pinion... (aka. '741')... 
Carrier casting numbers:? 1820657 (1957-1964), 2070741 (1964-1972). 
This assembly was typically used in low weight/low horsepower 
applications through low weight/medium horsepower and high weight/low 
horsepower applications. 
Pinion depth and bearing preload is set with shims.? Differential 
bearing setting (ie. backlash ) is set with threaded adjusters. 

1-3/4" large stem pinion... (aka. '742')... 
Carrier casting numbers:? 1634985 (1957-1964), 2070742 (~1961-1969). 
This assembly was replaced by a phase-in of the 1-7/8" pinion starting 
in the 1969 model year.? 1970 RW (Plymouth and Dodge mid-size) were 
the last models to use the 1-3/4" which appeared in a 2881489 case. 
This assembly was typically used in high weight/medium horsepower 
applications through high weight/high horsepower applications. 
Pinion depth and bearing preload is set with shims.? Differential 
bearing setting (ie. backlash ) is set with threaded adjusters. 

1-7/8" tapered stem pinion... (aka. '489')... 
Carrier casting numbers:? 2881488, 2881489 (1969-1974). 
This assembly was introduced in 1969 and was phased-in to relace the 
1-3/4" unit through 1970.? Note:? the 1-3/4" pinion also appeared in 
some '489' carriers during this period.? By 1973, the '489' was the only 
unit available in passenger car applications. 
This assembly was typically used in high weight/medium horsepower 
applications through high weight/high horsepower applications. 
Pinion depth is set with shims, preload is set with a crush sleeve.? 
Differential bearing setting (ie. backlash ) is set with threaded adjusters. 

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