Are the yokes on my D60/70 1330? They are out of an 82' Dodge 4x4 dually. They look small to me. I also have 1 ton drivelines out of a military truck. They look like they are the same size so they must be 1330 also I'm assuming? Is it worth going to 1350? If so would it only make sense to go 1350 on the diff's and drivelines? My blazer doesn't see rocks, but it will see mud and trails and the loud pedal from time to time. Thanks in advance.