I would say its fairly dangerous to go wot at like 40mph in 3rd... your clutches are going to HATE you for putting big power against the wall that is a 2.92 gear at 40mph...

I would just pull in 3rd, and floor it after you hit ~75mph... You will get plenty of resolution, and in terms of tuning you wont hit any crazy weird wot/full boost cells at 2100rpms.