1JZ auto shift kit???

[ICS]

I was looking at a auto jzz30 with 1jz on the weekend & was told the auto had been shift kitted. When driving at about 30km/h in 1st he changed into 2nd without boost & it shifted that hard it chirped the wheels. Has anyone seen or know how this is done? Is it done like the old holden trimatic by adding clutches & drilling holes & will it work on a
jzx90 chaser auto? Also apart from tyres, what damage can it cause?

Any info would be great. Thanks

[TasCressida]

do a search on shift kits champ. theres plenty on it here.

as as i know its just a valve body change in the auto.
find out what kit it has and research it that way also.