672 or 588 Type O posi
November 6th, 2017, 02:44 PM
#2
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Join Date: Feb 2013
Location: Phoenix, AZ
Posts: 14,701
Depends upon if you have an O-Type with HD 31 spline axles or a standard 28 spline axle rear.
Info from Brian Trick:
Here is a list of the posi units & what gears they will fit:
#673 = 2.56 & 2.78 ratios, 28 spline
#671 = 3.08 & 3.23 ratios, 28 spline
#588 = 3.42 & anything numerically higher, 28 spline
#672 = 3.42 & anything numerically higher, 31 spline
Info from Brian Trick:
Here is a list of the posi units & what gears they will fit:
#673 = 2.56 & 2.78 ratios, 28 spline
#671 = 3.08 & 3.23 ratios, 28 spline
#588 = 3.42 & anything numerically higher, 28 spline
#672 = 3.42 & anything numerically higher, 31 spline
Last edited by Fun71; November 6th, 2017 at 02:47 PM.
November 6th, 2017, 08:44 PM
#4
Registered User
Join Date: Feb 2013
Location: Phoenix, AZ
Posts: 14,701
My understanding is the housing for the 31 spline axles has larger diameter carrier bearings than the 28 spline housing, so if yours is an original 28 spline housing then I don't think you can fit a 672 carrier in the bearing saddles/caps.
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