From the 58 shop manual and the 59 suppliment, the posi was offered in 59. But since I recently got a supposed stock 59 old style rear end and it has a posi unit in it. Have not counted teeth yet. Also the axle in my 59 is the new style unit that was offered as the posi option. So I'm thinking they did an old style bolt in differential 3rd member with posi for a short period, then switched to the new style. Since I have one. Anyone else know about this?

Last edited by Truckrolet; 07/13/2011 11:40 PM.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.


As of 10-26-2022, A 55.2 Taskforce long bed now the work begins