1995 lexus sc 400 wont exceed 60 mph. automatic transmission. Please help

off and on yes, is it transmission shift solenoid ? Or failing transmission ?

I couldn't tell you. I don't have the same resources as the government , to infiltrate your cars database and retrieve the trouble codes for trans. and engine. Have codes read (at a shop , NOT autozone) need both engine AND trans. codes. JUST remember , codes do NOT = parts!! They indicate the system/circuit that is at fault , or being affected by a fault. Post code #s not just descriptions!!!....good luck.