i was thinking of buying a complete 3rd member for my 69mustang that now has 28 spline 3.50 posi to a 31 spline 3.91 posi with axles, any ideas. thanks.
Do you mean a assembled thrid member 31 spline setup all ready? Might want to check your axle bearing size small or big for the change of axles. 31 spline axles are the big bearing, normally.