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Discussion Starter #1
I searched but was unable to get this answered.
im looking at a posi unit tonight that has 4.10 gears and out of a 72 p/u.
for an 8.5 rear.
my 72 has a 8.5 rear.
WOULD THIS POSI WORK FOR ME? WHAT DO I NEED TO LOOK FOR?
thanks
 

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13,309 Posts
pretty sure its 73 or 75 and up on the PU rears...

would most likely be a 12 bolt truck unit in the PU in 1972... not to be confused with the car 12 bolt...
 

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'88 up is 30 spline.
 
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