dodgeman,i finally checked the wagon at rushes,it says hb on the build plate,but is probably a 3.889:1 ratio,cause the a14 is still in it.the 4 speed's sitting on the ground next to it,also.as for the spacer to put a h150 into a h145 housing,the pitroad website shows such a creature in the diff section,so it must be necessary.the kit looks like 2 diff gaskets & a shim the same shape as the gaskets.i've got one or two more places i can check for late sunny wagons,so i'll keep you 'posted'.paul.