i am having troubles with my t50's and i would like to make some questions

Does anyone know if i can fit a 2nd and 3rd gears in my t50 rwd box, in order to make them a bit taller ?

Glad to see some answers

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What problem are you trying to solve?
If you feel the gear spacing isn't appropriate for the driving you're doing, the easiest thing to do is to change the final gear ratio. If you're in an AE86, the stock rearend gear ratio is 4.3:1. You can get a lower ratio, something like a 4.1:1 or 3.9:1 to raise the speed in each gear and effectively increase the gear spacing. Going the other way, like with a 4.5:1 or 4.77:1 rear gear reduces the max speed in each gear, effectively shortening the spacing.

For road driving, I feel that the 4.3:1 gear is perfectly suited to the T50 gearbox. That is also a great combination for the NorCal race tracks, with the exception of Thunderhill West.