Welcome Onestone.
HydraMatic transmissions of this era are very sensitive to proper throttle linkage adjustment. Maybe that is all that is wrong with yours. When you say "only shifts two gears instead of four" do you mean it only shifts once (for instance from 2nd to 3rd gear) or does it shift two times (2nd to 3rd and then 3rd to 4th)?
Can you tell which gears it is using?
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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