Econoline 9" 28 or 31 spline

[BIG98XJ]

Found a shit load of 9"ers under econolines at my local yard, are they 28 or 31spline? Figured id ask before I start pulling shafts. few FF60s as well not sure if I want to go 8lug though

[JJS]

can you at least give a year range?

[BIG98XJ]

most of them were 80s I believe

[ImNotRight]

under trucks/vans they should all be 31 spline.

[welndmn]

So of the rectangle like vans (from the 60's) are 28 spline, but just about all of the 75+ newer vans should be 31 spline.