1985 (CALIFORNIA) 300 TDT. Shifts right up to 4th gear ( by 20 mph) even if I floor it. Bowden cable adjustment does nothing, all the way in or out - NO change. I can even disconnect cable from socket - no difference. I can shift through gears "manually" no problem shifts well. Car gets up to speed well 60, 70, 80 mph not a problem. But before 20 mph - acceleration is hindered by quick up shifting - on a hill (going up) everybody passes me, again until I get to 30, 40 mph. Help...Fluid is okay filter changed, modulator changed, (By indie mechanic) says overhaul. Anybody? I have posted this before - got different responses - most trying to convince me bowden cable not adjusted right. Anything else I should look for? Thanks in advance for any ideas.