Which replacement servo for T-maxx?
Do you have a price limit? If you want one for cheap, the Cirrus CS-80 has 130 oz of torque versus the 80 that is in the stocker.
If you want to replace them with quality units, I recommend the JR Z590m for throttle and the JR Z8550 for steering. I have had Airtronics 94358 servos, two of them actually, and both failed on me. I had to combine parts to make one good servo, so I no longer will buy those servos. I will only buy JR and Futaba servos now.