What are your rpm's at 60 mph? Are you sure it's in 3rd, and not in 4th?

It is more likely that you are not getting 1st gear, and that it's actually starting in 2nd, then shifting to 3rd and 4th.

SteveM

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner