The answer to this may just be "it's an old car" but I'm new to working on cars so I'll just ask. The speedometers on these trucks have the little recommended gear ranges for 1st, 2nd, and 3rd but I find I'm in 4th by the time I'm going 30mph, not getting anything close to range indicated on the speedometer. Is this normal? I know the gears on these are notoriously short - if I'm rolling at all I skip 1st - but what accounts for it being so different than what the speedo seems to suggest? Should my gears have more range in them?