Twin cs has 100% more tooth engagement, one on each side of mainshaft, pushing into each other, so there is very little load pushing the case apart. Another option would be an eaton 5spd.
Finding a huge sae bellhousing adapter for the 13 spd will be tricky.
use big truck clutches. Valair ought to be able to set you up.
Also, the 13 spd is really a 9spd with a second splitter on the tail housing. some did come with another splitter making something like 17 gears.there is no shortage of ratios for you to pull with.
They are huge. And weigh something like 700 pounds.
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