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			alot depends on conditionis the housing and tubes rusted/ pitted?
 brakes complete and drums good condition?
 original spring perches in tact?
 3 or 4 series carrier? (3 is more common)
 no issues with axles, hubs, wheel studs?
 original C-clips or eliminators?
 How long ago did you have the 3.73 gears installed?, was it totally gonme through and rebuilt? or just gears ?
 
 Need more info & pics for value
 
 Also, the "BT" code was used for 68' production too
 You may want to look at the casting date code in top LH corner next to rear cover , see if it is a 68' or 69' rear axle
 
 The "E" just means Eaton brand posi unit
 
 IMHO, if it is a complete, clean, stock condition (just gear change, but 3.73 is very popular) I would say $1,800-2,000
 
 Hope this helps, Jeff
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