1983 300SD....Engine pulls well in all gears but first gear duration is not long enough. First gear changes out at about 3,000 rpm or so. Second and third shifts occur higher in the rpm band (4,000 & 4,700). But first shifting out so soon gets you back to not much power rpm. Zero to 60 would be quicker if I could get it to hang on to first gear longer. Any ideas?

Regards,

Run-Em