8.25 setup, any ideas?

SO.. here's the skinny... My Suregrip is wrong. Pana.Mopar is having the same problem. I'd like to figure out WHY it won't work, to be able to explain it to someone else. If the Sg units we both bought were actually for a Dodge Dakota 8.25, then why won't they work in our rearends? My Axles will fit the Splines in the SG unit, so we know they're 27 splines... and NO! Its not because 2.45 carriers are different. That fact has nothing to do with what Pana and I are doing. As far as I can tell, a Dak was only available with a Minimum of 3.21s. Thing is.. neither of our SG units have a place for the ABS tone ring... I am pretty sure that all Daks with the 8.25 had ABS. I don't see how we could figure out exactly what we have. The 8.25 ring gear fits on it just fine..., the bearings press on, but the ring gear seat is 1/4 inch from where it should be.