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Old 07-30-2005, 01:56 PM
CT67GTX CT67GTX is offline
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Join Date: Jul 2005
Location: East Windsor, CT
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Default 489 vs #2 rear end

Can anyone explain the difference between these two rears? I am new to the Mopar ranks and need a reasr for my '67 GTX and not sure which to get. Thanks in advance.

Gary N
CT
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  #2  
Old 07-30-2005, 03:52 PM
John Kunkel John Kunkel is offline
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#2 is the 742 housing (last three digits of the casting number on the drivers side) with a straight 1 3/4" pinion shaft used prior to '69.
The 489 housing has a 1 7/8" tapered pinion shaft and was used from '69-on.

The pinion shaft diameter and the bearing size is the major difference, the 742 would have the preferred clutch type Sure-Grip unit (is so equipped) and the 489 would have the less desireable cone type Sure-Grip.

The 489 uses a crush sleeve to set the bearing preload which is a source of problems; it can be replaced by an aftermarket spacer for more reliability.
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