Oz EconolineF100 Posted August 23, 2018 Share Posted August 23, 2018 Hi guys do our trucks come with 28 or 31 spine axles from factory as am looking at changing them? Link to comment Share on other sites More sharing options...
Gary Lewis Posted August 24, 2018 Share Posted August 24, 2018 Darin - I believe all of the trucks came with 31 spline axles. But there’s a remote chance that the F100’s with the 4 1/2” bolt circle axles came with 28’s. I’ll research that soonest. Link to comment Share on other sites More sharing options...
PetesPonies Posted August 24, 2018 Share Posted August 24, 2018 yeah, not sure about the newer trucks, but certainly all the older ones did. I used a 3.89 31 spine center section for my '68 1/2 CJ Mustang. It came with 31 spline. Link to comment Share on other sites More sharing options...
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