1997 Tercel Drivetrain Upgrades

I'd like a late model Automatic Transmission with more gears

for Interstate driving - currently engine RPM at 75_+ seems screaming.

Is there a late model bolt in motor/trans combo that doesn't require a welder?

Also .. steering is too quick at Interstate speeds - sneeze & it's guardrails.

Is there a less quick set up that bolts in ?

It's a 1997 Tercel Blackhawk in very good condition.

Thanks in Advance.

BMT