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Well, all trannys have the aformentioned under drive. Every gear except the final drive on an old tranny is underdrive. The final gear is one to one...direct drive, and then the newer overdrives that'll spin the drivce shaft faster than engine speed.
I'll asume you actually mean a granny gear, or a gear that is worthless in all real aplications in day to day life.
I am unaware of any overdrive trannys with a granny gear in them at all.
If your truck is a 3/4 ton or a one ton, your granny gear may actually be the low gear in the rear axle, and a 'normal' first gear.
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