305 engine
Hi I have a 71 Chevy c10 with a 305 engine and a
700 transmission I recently got it back up the par
inspected and tagged and as I was driving it home
from school I got up to 20mph and my engines
started spinning out getting extremely loud and not
going faster than 20 I let of the gas and it was just
fine any speed before 20 but everytime I got back
up to 20 it would do it again only way to get over
was to floor it but the engine would make a bad
sound what is this. I have already drained the
transmission fluid and oil cleaned out the
transmission of some gunk and added new fluids
and it is still doing this do I need a new
transmission or what is happening please help.