Technical automatic transmission 3L30 TH180 Trimatic opel CIH fitting extra clutch discs

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Technical automatic transmission 3L30 TH180 Trimatic opel CIH fitting extra clutch discs

huramentzefix

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I saw this video on youtube of the australian guy overhauling the holden trimatic.
(for the ones who don't know, the fiat spider automatic transmission 3L30, TH180, Trimatic, and opel CIH are all the same. A GM general motor transmission built by GM in france).
I am converting my lada niva to a fiat 131 2.0L engine combined with the spider automatic transmission.
It is common to add extra clutch packs to transmission for racing purposes and so that they can handle more power.

I would like to know how and what I need to machine from the piston to add extra clutch disks?
 
Model
TC 131 2.0L 2000
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