96 GMC trans prob. HELP!

everyhing was fine with the truck , stopped to eat went to leave truck went into reverse just fine, went into drive just fine started going,,,,,,,, not just fine ,felt like the brakes were on,truck wanting
to die, so i stopped truck would not go again..NO GEARS at all,, then shut it off and started it again, and ah ha GEARS but only 1 nomatter what gear i was selecting had to trailer it home. now it is still stuck in drive or od i dont know ...........cable.-good ,fluid-good,74k miles on it WHAT WENT WRONG please help
No matter where You go, There You are.......
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What model of truck, 2WD or 4WD?
Doc

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Did you check the shift linkage?
Standard or Auto?
Which tranny?

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5.7,sierra, 1500
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is the 'PRND321' in the dash lit up ?

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