Join Date: Aug 2010
Location: Calgary, Canada
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In all of my years around these cars I've never seen someone break one of these transmissions, let alone with a stock IS250. I've seen a lot of complaints about noise as well as a number of clutch issues, but never anything broken because of too much torque. These transmissions were used in a number of vehicles with more torque than the IS350, including the IS220d with 300ft-lbf at the flywheel and the FJ Cruiser which is also much heavier to boot.
The most I've seen run through it was the Ray Hall GT86 which used the RA62 behind a twin-turbo 4.0L 2GR-FSE that put out 550ft-lbf of torque.
The transmission can easily take the torque of a stock IS350 engine from what I've seen. Time will tell.
2011 Lexus IS350 6MT F-Sport with LSD
1986 Toyota Corolla GT-S Supercharged with TRD Stuff
1993 Toyota Previa 5MT Studded Ice Race Van