You can measure any way you want to determine if a certain differential will fit. I am just saying what WMS means. As far as the rest of the stuff, too much for me to figure out.
WMS is from axle flange to axle flange. Drums can be different thicknesses. Sometimes there is no choice, you have to measure what you can and interpolate. That's why nobody ever knows what fits and why the info is different on the web. To many people, it means drums on. Some measure backing plates. The old school meaning was axle flange even though it sound like drums shoulds be on. Just like "Frame off restoration" is really "Body off".
Like "top loader" has nothing to do with the gear shift lever location or whether transmission has linkage or not.
The internet says pre 2000 S10 4X4 rear is what works for your truck. Some have disc brakes and some have posi. Says you want 59". None of this info is verified. The perfect all around ratio is 3.73. Highway cruise and acceleration mixed. If that's what you want. Source: me.
Be careful of copy and paste info that you see over and over on different websites. Makes you think it's multi source info. It's NOT.
