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Modular Assemblies

Center section is sandwiched by aluminum mounting plates, similar to toploaders ( liveaxles) but are designed as conventional spool and axles assemblies, often interchangeable pumpkin center sections with ford 9".

 
Jack Chrisman Enterprises
9" and 9.5' Modular Assemblies

 
 
Mark Williams 9"-  9.5" -
With dimensions and offsets very similar to the 9" Ford, very little modifications are necessary to change over to the 11". The downside to the 11" is that it weighs about 75 Lbs. more than a comparable 9" Ford. Gear changes can be rather difficult also, It is recommended that the 11" be run in situations where gear changes are not frequent. The cost of replacing worn gears and the dependability of the 11" make up for its downsides.

Shown without full floater ends ( uses standard flanged axles ) and 4 link  suspension brackets
Shown with full floater ends and FC/Dragster brackets
Mark Williams 11"-
With dimensions and offsets very similar to the 9" Ford, very little modifications are necessary to change over to the 11". The downside to the 11" is that it weighs about 75 Lbs. more than a comparable 9" Ford. Gear changes can be rather difficult also, It is recommended that the 11" be run in situations where gear changes are not frequent. The cost of replacing worn gears and the dependability of the 11" make up for its downsides.
 
Mark Williams 12 - bolt -
uses 12" (chevy) pro gears, Solid Mount or 4-Link Assy, 35 spline aluminum spool, MW axles (gundrilled/honed).