[font=Arial, Helvetica, sans-serif]The year split is '72-88 and 89+. I shall refer to these as "first design" and "second design". Of course, there may be variations. Differences between these years are noted below. Where the difference is known only to apply to certain "types", I shall indicate this. Otherwsie, it is not known whether the differences noted between the years apply to all types or not.[/font]
- [font=Arial, Helvetica, sans-serif]Second design axles have more fins on the center section[/font]
- [font=Arial, Helvetica, sans-serif]First design axles 1984 and earlier use a different pinion straddle bearing than 1985 and later[/font]
- [font=Arial, Helvetica, sans-serif]Second design SRW axles in 1-ton pickup trucks and 3/4 ton Suburbans changed to allow for a slide-off drum (drum can be removed without pressing out the wheel studs). The backside of these hubs is not machined flat to accept a rotor, for example. The hub flange is also further inboard to allow for the thickness of the drum.[/font]
