10-12-2011, 06:40 PM
I hate to say it but some where I have a comparison of all posi units, it clearly states that Power Lock is the most aggressive posi with out going to a true locker. That is why I have it in the front of my 71. True trac is a close second to the factory locker, but if you chose to go this route I will share an old school upgrade to a factory style locker. When I worked at the ford dealership there was an oldtimer who drag raced and saw me rebuilding a oe posi unit. He showed me how too do it right and to put some small washers behind the springs. This increases the pressure on the clutch disks and keeps it holding longer before the torque can over power it. The other thing he said was to not use an additive. This incresses the slippage to make it more comfortable for people who are not accustome to driving something that will chirp tires on corners. In the end it comes down to your budget. But in my mind if I didnt want a locker I would go with the Power Lock unit.
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