I'm searching for a new rearend to replace my spicer 70 with 4. 10(My housing is shot). I have found one locally and I beleive it is a 60, but It has a 12 bolt cover. Did 60's come in the diesels?? I'm worried it might be to light of a rearend. Are the yokes the same in all 94+ trucks?? I'm hoping this will be a perfect fit, and no changes will be needed. What rearends have the 12 bolt cover???